CN101253553B - Method for decoding an audio signal - Google Patents
Method for decoding an audio signal Download PDFInfo
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- CN101253553B CN101253553B CN2006800316332A CN200680031633A CN101253553B CN 101253553 B CN101253553 B CN 101253553B CN 2006800316332 A CN2006800316332 A CN 2006800316332A CN 200680031633 A CN200680031633 A CN 200680031633A CN 101253553 B CN101253553 B CN 101253553B
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- G—PHYSICS
- G10—MUSICAL INSTRUMENTS; ACOUSTICS
- G10L—SPEECH ANALYSIS OR SYNTHESIS; SPEECH RECOGNITION; SPEECH OR VOICE PROCESSING; SPEECH OR AUDIO CODING OR DECODING
- G10L19/00—Speech or audio signals analysis-synthesis techniques for redundancy reduction, e.g. in vocoders; Coding or decoding of speech or audio signals, using source filter models or psychoacoustic analysis
- G10L19/008—Multichannel audio signal coding or decoding using interchannel correlation to reduce redundancy, e.g. joint-stereo, intensity-coding or matrixing
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- G—PHYSICS
- G10—MUSICAL INSTRUMENTS; ACOUSTICS
- G10L—SPEECH ANALYSIS OR SYNTHESIS; SPEECH RECOGNITION; SPEECH OR VOICE PROCESSING; SPEECH OR AUDIO CODING OR DECODING
- G10L19/00—Speech or audio signals analysis-synthesis techniques for redundancy reduction, e.g. in vocoders; Coding or decoding of speech or audio signals, using source filter models or psychoacoustic analysis
- G10L19/04—Speech or audio signals analysis-synthesis techniques for redundancy reduction, e.g. in vocoders; Coding or decoding of speech or audio signals, using source filter models or psychoacoustic analysis using predictive techniques
- G10L19/16—Vocoder architecture
- G10L19/167—Audio streaming, i.e. formatting and decoding of an encoded audio signal representation into a data stream for transmission or storage purposes
Abstract
The invention relates to a method for decoding an audio signal, to allow an audio signal to be compressed and transfered more efficiently. The inventive method comprises steps of receiving an audio signal with spatial information signal, obtainning location information using the number of time slot and parameter of audio signal, establishing a multi-channel audio signal by applying spatial information signal to down-mix signal, and performing a multi-channel array for a multi-channel audio signal in response to the output channel.
Description
[technical field]
The present invention relates to Audio Signal Processing, relate in particular to the devices and methods therefor that is used for decoded audio signal.
[background technology]
Generally speaking, in the situation of sound signal, audio signal encoding apparatus becomes the down-mix audio signal of monophony or stereo type with audio signal compression, rather than compresses each multi-channel audio signal.Audio signal encoding apparatus will be sent to decoding device with spatial signal information through the down-mix audio signal of compression, or will be stored in the storage medium through the down-mix audio signal and the spatial signal information of compression.In this situation, the spatial signal information of when multi-channel audio signal is carried out multi-channel audio, extracting is used when from down-mix audio signal, recovering original multi-channel audio signal.
Configuration information generally is unmodifiable, and the head that comprises this information only is inserted in the sound signal once.Because configuration information once sends through being inserted in the sound signal in beginning, thus audio signal decoder the situation of basic point reproducing audio signal from random the time owing to there is not configuration information between decode empty message context problem is arranged.
Audio signal encoding apparatus is generated to down-mix audio signal and spatial signal information in the bit stream together or respectively, transfers them to audio signal decoder then.So if nonessential information etc. are included in the spatial signal information, then signal compression and transmission efficiency will reduce.
[disclosing]
[technical matters]
An object of the present invention is to provide a kind of devices and methods therefor that is used for decoded audio signal, by this can be through spatial signal information optionally being included in the head basic point reproducing audio signal from random the time.
Another object of the present invention provides a kind of devices and methods therefor that is used for decoded audio signal, can use variable number of bits to come to represent expeditiously the position with the time slot of application parameter collection by this.
Another object of the present invention provides a kind of devices and methods therefor that is used for decoded audio signal, can be shown minimum variable number of bits and improves audio signal compression and transmission efficiency through carrying out the down-mix audio signal layout or multichannel being mapped to the required apsi message of loudspeaker by this.
Another purpose of the present invention provides a kind of devices and methods therefor that is used for decoded audio signal, by this can be through multichannel is mapped to loudspeaker reduces the required quantity of information of signal layout with not carrying out the down-mix audio signal layout.
[technical solution]
Above-mentioned purpose of the present invention, feature and advantage will be set forth in the following description, and from then on part will be described and become obvious.To set forth the embodiments of the invention that to realize above-mentioned purpose with reference to accompanying drawing.
To carry out detailed reference to a preferred embodiment of the present invention now, its example is shown in the drawings.
Fig. 1 is the arrangement plan that is sent to the sound signal of audio signal decoder from audio signal encoding apparatus according to an embodiment of the invention.
With reference to figure 1, sound signal comprises audio descriptor 101, down-mix audio signal 103 and spatial signal information 105.
In the situation of the sound signal of using encoding scheme to reproduce to be used for broadcasting etc., sound signal can comprise that not only audio descriptor 101 and down-mix audio signal 103 can also comprise auxiliary data.And, the present invention includes spatial signal information 105 as auxiliary data.In order to make audio signal decoder without the essential information of analyzing audio signal with regard to the ability audio coding decoding, sound signal can optionally comprise audio descriptor 101.Audio descriptor 101 is configured to have the essential information of the necessary minority of audio decoder, such as the number of the transmission of audio signals rate of being sent, sound channel, through the identifier of the encoding and decoding of the SF of the data of compression, the current use of indication etc.
Audio signal decoder can utilize audio descriptor 101 to understand the type of the encoding and decoding that sound signal is done.Particularly, utilize audio descriptor 101, audio signal decoder just can be understood sound signal, and whether usage space information signal 105 disposes multichannels with down-mix audio signal 103.Audio descriptor 101 is independent of down-mix audio signal 103 or the location, spatial signal information 105 ground that is included in the sound signal.For example, audio descriptor 101 is positioned in the independent field of indicative audio signal.Do not comprise in down-mix audio signal 103 in the situation of head that audio signal decoder can utilize audio descriptor 101 to come decoded channels reduction audio signal 103.
Down-mix audio signal 103 is the signals that generate from multichannel is carried out multi-channel audio.And down-mix audio signal 103 can the down-mix unit from be included in audio signal encoding apparatus generate or artificial the generation.Down-mix audio signal 103 can be classified into situation that comprises head and the situation that does not comprise head.Comprise in the situation of head that in down-mix audio signal 103 head is that unit is included in each frame by frame.Do not comprise in the situation of head that in down-mix audio signal 103 like what mention in the above description, down-mix audio signal 103 audio descriptor 101 capable of using are decoded.Down-mix audio signal 103 takes to comprise that each frame comprises the form that does not comprise head in form or the frame of head.And down-mix audio signal 103 is included in the sound signal up to end of text in an identical manner.
Spatial signal information 105 also can be classified into the situation that comprises head 107 and spatial information 111 and only comprise spatial information 111 and do not comprise the situation of head.The head 107 of spatial signal information 105 is that with the difference of the head of down-mix audio signal 103 it needn't be inserted in each frame identically.Particularly, spatial signal information 105 can and not comprise that the frame of head uses together with the frame that comprises head.Be included in most information in the head 107 of spatial signal information 105 and be through the decode configuration information 109 of spatial information 111 of version space information 111.Spatial information 111 is configured to have a plurality of frames, and each frame all comprises several time slots.Time slot is illustrated in by each time interval in the situation of time interval division frame.The number of included time slot is included in the configuration information 109 in frame.
Configuration information 109 comprises number, channel configuration information, loudspeaker map information of signal arrangement information, signal conversion unit etc. and number of time slot.
The signal arrangement information is meant to be shown in whether sound signal will be by layout so that carries out the channel expansion audio mixing before with reverting to multichannel through the down-mix audio signal 103 of decoding.
Signal conversion unit is illustrated in through down-mix audio signal 103 being carried out the channel expansion audio mixing is transformed into OTT (one to the two) frame of two signals with a down-mix audio signal 103 when generating multichannel or two down-mix audio signal 103 being transformed into TTT (two to the three) frame of three signals.Particularly, OTT or TTT frame are the notion frames that when recovering multichannel, uses through in the channel expansion audio mixing unit (not shown) that is included in audio signal decoder.And, be included in the spatial signal information 105 about the type of signal conversion unit and the information of number.
Channel configuration information is the information configured that indication is included in the channel expansion audio mixing unit in the audio signal decoder.Channel configuration information comprises whether the indicative audio signal passes the identifier of signal conversion unit.Audio signal decoder can utilize channel configuration information to understand to be input to the sound signal of channel expansion audio mixing unit whether to pass signal conversion unit.Audio signal decoder uses information, the channel configuration information about signal conversion unit to wait becomes multi-channel audio signal with down-mix audio signal 103 channel expansion audio mixings.Audio signal decoder is included in signal conversion unit information in the spatial information 111, channel configuration information etc. through utilization to carry out the channel expansion audio mixing to down-mix audio signal 103 and generates multichannel.
The loudspeaker map information is meant the information which loudspeaker multi-channel audio signal when exporting the multi-channel audio signal that generates through the channel expansion audio mixing to loudspeaker respectively will be mapped to that is shown in.The loudspeaker map information that the audio signal decoder utilization is included in the configuration information 109 outputs to corresponding loudspeaker with multi-channel audio signal.
Spatial information 111 is when generating multi-channel audio signal, to be used for through combine to provide the information of spatial impression with down-mix audio signal.Spatial information comprises that the ICC (correlativity between sound channel) of CLD (levels of channels is poor), the being closely related property between the indicative audio signal or the similarity of the energy difference between the indicative audio signal, indication utilize other signal to wait the CPC (sound channel predictive coefficient) of the coefficient of predicting audio signal value.And parameter set is indicated one group of these parameter.
And, not only comprise these parameters in the spatial information 111, also comprise: whether fixing indication apply the position of time slot of parameter set frame identifier, put on the number of the parameter set of a frame, apply the positional information etc. of the time slot of parameter set.
Fig. 2 is the process flow diagram of the method for according to another embodiment of the invention sound signal being decoded.
With reference to figure 2, audio signal decoder receives the spatial signal information 105 (S201) that is transmitted with the bit stream form by audio signal encoding apparatus.The form of the bit stream that spatial signal information 105 can leave with the flow point with down-mix audio signal 103 transmits, and transmits in auxiliary data that maybe can be through being comprised in down-mix audio signal 103 or the growth data.
Spatial signal information 105 be through the situation that transmits with down-mix audio signal 103 combination in, the demultiplex unit (not shown) of audio signal decoder separates into down-mix audio signal 103 and the spatial signal information 105 through encoding through coding with received sound signal.Spatial signal information 105 signals through coding comprise head 107 and spatial information 111.Audio signal decoder confirms whether comprise head 107 (S203) in the spatial signal information 105.
If head 107 is included in the spatial signal information 105, then audio signal decoder extracts configuration information 109 (S205) in 107 from the head.
Audio signal decoder confirms that whether this configuration information is (S207) that extracts in first head 107 included from spatial signal information 105.
If configuration information 109 is to extract from first head that from spacing wave 105, extracts 107, audio signal decoder decoding configuration information 109 (S215) and then according to the spatial information 111 of the transmission configuration information 109 after of decoding through the configuration information 109 of decoding.
If the head that from sound signal, extracts 107 is not first head that from spatial signal information 105, extracts 107, then the audio signal decoder configuration information confirming from the head to extract in 107 109 whether with the configuration information that from first head 107, extracts 109 identical (S209).
If configuration information 109 is identical with the configuration information 109 that from first head 107, extracts, then audio signal decoder uses through the configuration information 109 that from first head 107, extracts of the decoding spatial information 111 of decoding.If the configuration information that is extracted 109 is not identical with the configuration information 109 that from first head 107, extracts, then audio signal decoder confirms whether mistake (S211) takes place in this sound signal on the transmission path from the audio signal encoding apparatus to the audio signal decoder.
If configuration information 109 is variable, even then configuration information 109 and the configuration information 109 that from first head 107, extracts not are identical mistake to take place.Therefore, audio signal decoder is updated to variable header 107 (S213) with head 107.Audio signal decoder is then to decode from the configuration information 109 that through the head 107 that upgrades, extracts (S215).
Audio signal decoder is decoded according to the 109 pairs of spatial informations 111 that after configuration information 109, transmit of configuration information through decoding.
If immutable configuration information 109 is not identical with the configuration information 109 that from first head 107, extracts, then this means on the audio signal transmission path mistake has taken place.Therefore, audio signal decoder removes the spatial information 111 that is comprised in the spatial signal information 105 of the configuration information 109 that comprises mistake, or corrects the mistake (S217) of spatial information 111.
Fig. 3 is the process flow diagram of the method that sound signal is decoded according to another embodiment of the invention.
With reference to figure 3, audio signal decoder receives the sound signal (S301) that comprises down-mix audio signal 103 and spatial signal information 105 from audio signal encoding apparatus.
Audio signal decoder separates into spatial signal information 105 with the sound signal that receives and then spatial information that separates 105 and the down-mix audio signal of separating 103 is sent to core codec unit (not shown) and spatial information decoding unit (not shown) respectively with down-mix audio signal 103 (S303).
Audio signal decoder extracts number of time slot and parameter set number from spatial signal information 105.Number of time slot that the audio signal decoder utilization extracts and parameter set number find the time slot position that applies parameter set.According to the order of corresponding parameter set, the position of the time slot that applies corresponding parameter set is represented as variable number of bits.And, through reducing the bit number of position that expression will apply the time slot of corresponding parameter set, representation space information signal 105 expeditiously just.And, will come illustrated in detail will apply the position of the time slot of corresponding parameter set with reference to figure 4 and Fig. 5.
In case obtained time slot position, audio signal decoder just comes spatial signal information 105 decode (S305) through the corresponding parameters collection being put on corresponding position.And, audio signal decoder in the core codec unit to down-mix audio signal 103 decode (S305).
Audio signal decoder can be through in statu quo generating multichannel to carrying out the channel expansion audio mixing through the down-mix audio signal 103 of decoding.But audio signal decoder can carry out the order (S307) of channel expansion audio mixing layout before through the down-mix audio signal 103 of decoding to corresponding signal.
The audio signal decoder utilization generates multichannel (S309) through the down-mix audio signal 103 of decoding with through the spatial signal information 105 of decoding.Audio signal decoder utilizes spatial signal information 105 that down-mix audio signal 103 is generated as multichannel.Mentioned like above description, spatial signal information 105 comprises the signal conversion unit number and is used to represent that down-mix audio signal 103 passes signal conversion unit and still do not pass the channel configuration information that signal conversion unit is just exported when making sound channel expansion audio mixing.Audio signal decoder utilizes signal conversion unit number, channel configuration information to wait down-mix audio signal 103 is carried out channel expansion audio mixing (S309).To explain the method for using less bit number to represent channel configuration information and the method that disposes channel configuration information with reference to figure 6 and Fig. 7 after a while.
Audio signal decoder is mapped to the multi-channel audio signal (S311) that loudspeaker is generated with output with multi-channel audio signal by predetermined sequence.In this situation, along with the audio signal sequence of mapping increases, the bit number that is used for multi-channel audio signal is mapped to loudspeaker reduces.Particularly; In the situation of numbering to multi-channel audio signal in order; Because first sound signal can be mapped to one in whole loudspeakers, so sound signal is mapped to required the containing much information in mapping second or the follow-up required quantity of information of sound signal of loudspeaker.When second or follow-up sound signal be mapped to except by mapping with before sound signal before loudspeaker one of all the other loudspeakers the time, shine upon required quantity of information and just reduced.Particularly, increase to reduce through audio signal sequence and shine upon the required quantity of information of sound signal, just representation space information signal 105 expeditiously along with mapping.This method also is applicable to the situation of layout down-mix audio signal 103 in step S307.
Fig. 4 is the sentence structure of the positional information of the time slot that applies parameter set according to an embodiment of the invention.
With reference to figure 4, this sentence structure relate to expression about the information of parameter set number and about the information of the time slot that applies parameter set ' FramingInfo ' 401.
The frame that 403 indications of ' bsFramingType ' field are included in the spatial signal information 105 is anchor-frame or variable frame.Anchor-frame is illustrated in the predefined frame of the time slot position that wherein will apply parameter set.Particularly, the position of the time slot that applies parameter set is decided according to preset rules.Variable frame is illustrated in the frame that the time slot position that wherein will apply parameter set is not set as yet.So variable frame also needs time slot position information could represent to apply the position of the time slot of parameter set.In the following description, will be ' bsFramingType ' 403 called afters indication frame anchor-frame or variable frame ' frame identifier '.
In the situation of variable frame, ' bsParamSlot ' field 407 or 411 indications will apply the positional information of the time slot of parameter set.' bsParamSlot [0] ' field 407 indication will apply the position of the time slot of first parameter set, and ' 411 indications of bsParamSlot [ps] ' field will apply second or the position of the time slot of subsequent parameter collection.The position of the time slot that applies first parameter set is represented as initial value; And will apply second or the position of the time slot of subsequent parameter collection be represented as difference ' bsDiffParamSlot [ps] ' 409, promptly ' bsParamSlot [ps] ' is poor with ' bsParamSlot's [ps-1] '.In this situation, the ' ps ' meaning is a parameter set.First parameter set is expressed as ' ps=0 '.And ' ps ' can represent from 0 to less than the value the scope of the value of parameter set sum.
The time slot position 407 or 409 that (i) will apply parameter set is along with the ps value increases and increases (bsParamSlot [ps]＞bsParamSlot [ps-1]).(ii) for first parameter set, the maximal value of the time slot position that applies first parameter set is added 1 resulting value corresponding to the difference with number of time slot and parameter set number, and time slot position is expressed as ' quantity of information of nBitsParamSlot (0) ' 413.(iii) for second or the subsequent parameter collection, the time slot position that the time slot position ratio that applies the N parameter set will be applied (N-1) parameter set is big at least by 1, and even can have number of time slot is subtracted the parameter set number income value value of adding N and the value that obtains.With apply second or the time slot position ' bsParamSlot [ps] ' of subsequent parameter collection be represented as difference ' bsDiffParamSlot [ps] ' 409.And this value is represented as ' quantity of information of nBitsParamSlot [ps] '.So, can utilize (i) to (iii) finding with the time slot position that applies parameter set.
For example, if there are ten time slots to be included in the air-frame, and if three parameter sets are arranged, the time slot position that then will apply first parameter set (ps=0) is adapted to always and the time slot sum is subtracted parameter sum income value adds 1 time slot position that obtains.Particularly, corresponding position is suitable for and belongs to 1 to the time slot of the scope between the maximal value 8 one.Time slot position through considering to apply parameter set number increases according to parameter set, and just can understand the time slot position maximum that can apply remaining two parameter set is respectively 9 and 10.So, need tribit to indicate 1 to 8 the time slot position that applies first parameter set 407, it can be represented as ceil{log
2(k-i+1) }.In this situation, ' k ' is a number of time slot, and ' i ' is a number of parameters.
If will apply the time slot position 407 of first parameter set is ' 5 ', then will apply second parameter set time slot position ' bsParamSlot [1] ' should from ' 5+1=6 ' and ' select the value between the 10-3+2=9 '.Particularly, the time slot position that applies second parameter set can be represented as add the value that difference ' bsDiffParamSlot [ps] ' 409 obtains applying the value that the first parameter set time slot position adds 1 gained.So difference 406 can be corresponding to 0 to 3, it can be represented as 2 bits.For second or the subsequent parameter collection,, just can reduce bit number through being expressed as the time slot position that will apply parameter set difference 409 rather than direct representation time slot position.In the example in front, in the situation of direct representation time slot position, need 4 bits to represent in 6 to 9.But time slot position is expressed as difference only needs 2 bits.
Therefore, indication will apply the time slot of parameter set amount ' nBitsParamSlot (0) ' or ' nBitsParamSlot (ps) ' 413 or 415 positional information not only can be expressed as fixed number of bits and also can be expressed as variable number of bits.
Fig. 5 be according to another embodiment of the invention pass through parameter set is put on the decode process flow diagram of method of spatial signal information of time slot.
With reference to figure 5, audio signal decoder receives the sound signal (S501) that comprises down-mix audio signal 103 and spatial signal information 105.
If there is head 107 in the spatial signal information, then extract number of time slot included in the frame (S503) in the configuration information 109 of audio signal decoder from be included in head 107.If head 107 is not included in the spatial signal information 105, then extract number of time slot in the configuration information 109 the head 107 of audio signal decoder extraction before being included in.
Audio signal decoder extracts the number (S505) with the parameter set that is applied in frame from spatial signal information 105.
The audio signal decoder utilization is included in the position (S507) that fix or variable that identifier in the spatial signal information 105 confirms will apply in the frame time slot of parameter set.
If this frame is an anchor-frame, then audio signal decoder comes spatial signal information 105 decode (S513) through according to preset rules parameter set being put on corresponding time slot.
If this frame is variable frame, then audio signal decoder extracts the information (S509) about the time slot position that will apply first parameter set.As mentioned in the above description, can be that difference with number of time slot and parameter set number adds 1 value that obtains with the time slot position maximum that applies first parameter.
The audio signal decoder utilization obtains about applying second or the information (S511) of the time slot position of subsequent parameter collection about the information of the time slot position that will apply first parameter set.If N is equal to or greater than 2 natural number; This true time slot position that will apply parameter set of time slot position big at least 1 that the time slot position ratio that will apply the N parameter set then capable of using will apply (N-1) parameter set is expressed as minimum number bits, and even can have the value that number of time slot is subtracted parameter set number gained and add the value that N obtains.
And audio signal decoder comes spatial signal information 105 decode (S513) through the time slot position that parameter set is put on gained.
Fig. 6 and Fig. 7 are the synoptic diagram of the channel expansion audio mixing unit of audio signal decoder according to an embodiment of the invention.
Audio signal decoder will separate into down-mix audio signal 103 and spatial signal information 105 from the sound signal that audio signal encoding apparatus receives, and respectively down-mix audio signal 103 and spatial signal information 105 decoded then.As mentioned in the above description, audio signal decoder comes spatial signal information 105 is decoded through parameter being put on time slot.And audio signal decoder uses through the down-mix audio signal 103 of decoding with through the spatial signal information 105 of decoding and generates multi-channel audio signal.
If audio signal encoding apparatus is compressed into N input sound channel M sound signal and this M sound signal is sent to audio signal decoder with the form of bit stream, then audio signal decoder recovers and exports an original N sound channel.This configuration is called as the N-M-N structure.In some cases, if audio signal decoder can not recover this N sound channel, do not consider that then spatial signal information 105 ground are output into two stereophonic signals with down-mix audio signal 103.Yet, will no longer further discuss this situation at this.The fixing structure of the value of N and M will be called as fixedly channel structure therein.The value of M and the N structure that is represented as random value will be called as channel structure at random therein.Such as 5-1-5,5-2-5,7-2-7 etc. fixedly in the situation of channel structure, audio signal encoding apparatus comes transmit audio signals through being included in channel structure in the sound signal.Audio signal decoder comes sound signal is decoded through reading channel structure then.
Audio signal decoder adopts and comprises that the channel expansion audio mixing unit of signal conversion unit reverts to the N multichannel with M sound signal.Signal conversion unit is a down-mix audio signal 103 to be transformed into two signals or two down-mix audio signal 103 to be transformed into the notion frame of three signals through down-mix audio signal 103 being carried out be used for when the channel expansion audio mixing generates multichannel.
Audio signal decoder can obtain the information about the structure of channel expansion audio mixing unit through extracting channel configuration information in the configuration information from be included in spatial signal information 105 109.As mentioned in the above description, channel configuration information is the information configured that indication is included in the channel expansion audio mixing unit in the audio signal decoder.Channel configuration information comprises whether the indicative audio signal passes the identifier of signal conversion unit.Particularly, in the situation of in channel expansion audio mixing unit, passing signal conversion unit through the down-mix audio signal of decoding, can channel configuration information be expressed as and cut apart identifier, because the input and output signal number of signal conversion unit can change.And, in channel expansion audio mixing unit, not passing in the situation of signal conversion unit, can channel configuration information be expressed as and not cut apart identifier, because the input of signal conversion unit is by intactly output through the down-mix audio signal of decoding.In the present invention, cut apart identifier will be represented as ' 1 ', and do not cut apart identifier and will be represented as ' 0 '.
Channel configuration information can be represented with dual mode, promptly horizontal method and longitudinal method.
In horizontal method, if sound signal is passed signal conversion unit, that is, if channel configuration information be ' 1 ', then indicate via the lower layer signal of signal conversion unit output whether pass another signal conversion unit in proper order by cutting apart or do not cut apart identifier.If channel configuration information is ' 0 ', then indicate with next sound signal on one deck or upper strata whether pass signal conversion unit by cutting apart or do not cut apart identifier.
In longitudinal method; By cutting apart or each identifier of part sequentially indicates in all audio frequency signal on upper strata each whether to pass signal conversion unit, rather than whether indication upper strata one sound signal is passed signal conversion unit and is indicated lower floor's one sound signal whether to pass signal conversion unit then.
For the structure of same channel expansion audio mixing unit, the exemplary channel configuration information that illustrates of Fig. 6 is represented by horizontal method, and the exemplary channel configuration information that illustrates of Fig. 7 is represented by longitudinal method.In Fig. 6 and Fig. 7, signal conversion unit adopts for example OTT frame.
With reference to 6, four sound signal X of figure
1To X
4Get into channel expansion audio mixing unit.X
1Get into first signal conversion unit, be transformed into two signals 601 and 603 then.The signal conversion unit use that is included in the channel expansion audio mixing unit comes the converting audio frequency signal such as spatial parameters such as CLD, ICC.Signal 601 and 603 through the first signal conversion unit conversion gets into second converter unit and the 3rd converter unit, thereby as multi-channel audio signal Y
1To Y
4Exported.X
2Get into the 4th signal conversion unit, then as Y
5And Y
6Exported.And, X
3And X
4Do not pass signal conversion unit ground by directly output.
Because X
1Pass first signal conversion unit, thus signal configuration information be represented as cut apart identifier ' 1 '.Because channel configuration information is represented by horizontal method in Fig. 6; If cut apart identifier, then whether pass another signal conversion unit and sequentially be expressed as and cut apart or do not cut apart identifier via two signals 601 and 603 of first signal conversion unit output so channel configuration information is represented as.
If channel configuration information is ' 0 ', then whether pass signal conversion unit and show by cutting apart or do not cut apart identifier list with next sound signal on one deck or upper strata.So, for the signal X2 on upper strata representes channel configuration information.
With the X that passes the 4th signal conversion unit
2Be expressed as and cut apart identifier 1.The signal that passes the 4th signal conversion unit is directly output as Y
5And Y
6, thereby be represented as respectively and do not cut apart identifier 0.
The X that does not pass signal conversion unit and directly export
3And X
4Be represented as respectively and do not cut apart identifier 0.
Therefore, channel configuration information is expressed as 110010010000 by horizontal method.In this situation, for ease of understanding, channel configuration information is to extract from the configuration of channel expansion audio mixing unit.Yet audio signal decoder can read channel configuration information to obtain the information about the structure of channel expansion audio mixing unit through opposite mode.
With reference to figure 7, be similar to Fig. 6, four sound signal X
1To X
4Get into channel expansion audio mixing unit.Because longitudinal method with channel configuration information from the upper strata to lower floor be expressed as and cut apart or do not cut apart identifier, so as the identifier of the sound signal of the ground floor 701 of the superiors by the order expression.Particularly, because X
1And X
2Pass the first and the 4th signal conversion unit respectively, so channel configuration information separately is 1.Because X
3And X
4Do not pass signal conversion unit, so channel configuration information separately is 0.So the channel configuration information of ground floor 701 is 1100.In an identical manner, if order expression, then the channel configuration information of the second layer 703 and the 3rd layer 705 is respectively 1100 and 0000.Therefore, the whole channel configuration information of being represented by longitudinal method is 110011000000.
The channel configuration information that reads audio signal decoder disposes channel expansion audio mixing unit then.In order to make audio signal decoder can dispose channel expansion audio mixing unit, the indication channel configuration is to be represented or should be included in the sound signal by the identifier that longitudinal method is represented by horizontal method.Perhaps, channel configuration information is represented by horizontal method basically.Yet if represent that by longitudinal method channel configuration information is high efficiency, the identifier that audio signal encoding apparatus can make the indication channel configuration represented by longitudinal method is included in the sound signal.
Audio signal decoder reads the channel configuration information of being represented by horizontal method, just can dispose channel expansion audio mixing unit then.Yet; In channel configuration information is in the situation of being represented by longitudinal method, and audio signal decoder only could dispose channel expansion audio mixing unit during the number of included signal conversion unit number or input and output sound channel in having known channel expansion audio mixing unit.So audio signal decoder can dispose channel expansion audio mixing unit with the mode of the number of the number that extracts signal conversion unit in the configuration information from be included in spatial signal information 105 109 or input and output sound channel.
The audio signal decoder serial interpretation channel configuration information that starts from scratch.In detecting the number of cutting apart identifier 1 that is included in the channel configuration information and the as many situation of signal conversion unit number that from configuration information, extracts, audio signal decoder does not need further to read channel configuration information.This is because the number of cutting apart identifier 1 that is included in the channel configuration information equals to be included in the number of the signal conversion unit in the channel expansion audio mixing unit, is imported into signal conversion unit because cut apart identifier 1 indicative audio signal.
Particularly, as mentioned in the above example, if the channel configuration information of being represented by longitudinal method is 110011000000, then audio signal decoder need read 12 bits ability decoded channels configuration information altogether.Yet, be 4 if audio signal decoder detects the number of signal conversion unit, the numeral 1 that audio signal decoder is decoded in being included in channel configuration information to channel configuration information occurs 4 times.That is, audio signal decoder only is decoded to 110011 with channel configuration information.No longer further use channel configuration information, remaining value to be represented as although this is and do not cut apart identifier 0.Therefore, 6 bits because audio signal decoder needn't be decoded, decoding efficiency just can be improved.
In channel structure is that additional information is nonessential, because the number of the number of signal conversion unit or input and output sound channel is included in the configuration information that is comprised in the spatial information 105 in the situation of the fixedly channel structure preset.Yet; In channel structure is in the situation of its channel structure channel structure at random undetermined; Need additional information to come the number of indicator signal converter unit or the number of input and output sound channel, because the number of the number of signal conversion unit or input and output sound channel is not included in the spatial signal information 105.
With the information about signal conversion unit is example, in the situation of only using the OTT frame as signal conversion unit, is used to indicate the information of signal conversion unit can be represented as maximum 5 bits.Input signal getting into channel expansion audio mixing unit passes in the situation of OTT or TTT frame, and input signal is transformed into two signals or two input signals are transformed into three signals.So the number of output channels is that input signal is added the value that the number of OTT or TTT frame obtains.Therefore, the number of signal conversion unit is that number with output channels deducts the value that the number of number and the TTT frame of input signal obtains.Because generally can use maximum 32 output channels, so be used to indicate the information of signal conversion unit can be represented as the value in 5 bits.
Therefore, if channel configuration information represent by longitudinal method, and if channel structure be channel structure at random, then audio signal encoding apparatus should be expressed as maximum 5 bits separately with the number of signal conversion unit in spatial signal information 105.In above example, need 6 bit channel configuration information and 5 bits to be used to indicate the information of signal conversion unit.That is, need 11 bits altogether.This shows with represented channel configuration information by horizontal method compares, and the required bit quantity in configuration channel expansion audio mixing unit has reduced.Therefore, if channel configuration information is represented that by longitudinal method then bit number can reduce.
Fig. 8 is the block diagram of audio signal decoder according to an embodiment of the invention.
With reference to figure 8, audio signal decoder according to an embodiment of the invention comprises receiving element, demultiplex unit, core codec unit, spatial information decoding unit, signal layout unit, multichannel generation unit and loudspeaker map unit.
Receiving element 801 receives the sound signal that comprises down-mix audio signal 103 and spatial signal information 105.
The sound signal that demultiplex unit 803 receives receiving element 801 resolves to through the down-mix audio signal 103 of coding and the spatial signal information 105 through encoding, and will send to core codec unit 805 and spatial information decoding unit 807 respectively through the down-mix audio signal 103 of coding and the spatial signal information 105 of warp coding then.
Decode to the spatial signal information of encoding through the down-mix audio signal and the warp of coding respectively with spatial information decoding unit 807 in core codec unit 805.
As mentioned in the above description, spatial information decoding unit 807 is through extracting frame identifier, number of time slot, parameter set number, time slot position information etc. and coming spatial signal information 105 is decoded through parameter set being put on time slot corresponding from spatial signal information 105.
Audio signal decoder can comprise signal layout unit 809.Thereby signal layout unit 809 comes a plurality of down-mix audio signal of layout to come carrying out the channel expansion audio mixing through the down-mix audio signal 103 of decoding according to preset layout.Particularly, signal layout unit 809 becomes the individual sound signal of M ' with the N-M-N channel configuration with M down-mix audio signal layout.
Audio signal decoder can directly carry out the channel expansion audio mixing to down-mix audio signal according to the order that down-mix audio signal is passed core codec unit 805.Yet in some cases, audio signal decoder can be carried out the channel expansion audio mixing after the order of layout down-mix audio signal.
In some cases, the signal layout can be done the signal execution that sound channel expansion audio mixing becomes the signal conversion unit of three signals with two down-mix audio signal to getting into.
In the situation of sound signal being carried out the signal layout or only the input signal of TTT frame being carried out in the situation of signal layout, indicate the signal arrangement information of corresponding situation to be included in the sound signal by audio signal encoding apparatus.In this situation, the signal arrangement information be meant be shown in sound signal revert to burst before the multichannel whether will be by layout so that carry out the channel expansion audio mixing, whether only will carry out the identifier of layout etc. to signal specific.
If head 107 is included in the spatial signal information 105, then audio signal decoder uses the sound signal arrangement information be included in from the head in the configuration information 109 that extracts in 107 to come the layout down-mix audio signal.
If head 107 is not included in the spatial signal information 105, then audio signal decoder can use the sound signal arrangement information that extracts in the configuration information 109 from be included in last head 107 to come the layout sound signal
Audio signal decoder can not carried out the down-mix audio signal layout.Particularly, audio signal decoder can be through directly to 805 decodings and the signal that is sent to multichannel generation unit 811 carry out the channel expansion audio mixing rather than carry out the down-mix audio signal layout generating multichannel through the core codec unit.This is because the expectation purpose of signal layout can be reached through the multichannel that generates is mapped to loudspeaker.In this situation, just can compress more expeditiously and transmitting audio signal through not inserting in the sound signal about the information of down-mix audio signal layout.And the complexity of decoding device can reduce because of not carrying out the signal layout in addition.
Audio signal decoder comprise loudspeaker map unit 813 with audio signal output that will be through multichannel generation unit 811 to loudspeaker.
[table 1]
| | Loudspeaker | |
| 0 | FL: |
|
| 1 | FR: |
|
| 2 | FC: in before | |
| 3 | LFE: low frequency strengthens | |
| 4 | BL: left back |
| 5 | BR: right back |
| 6 | FLC: in |
| 7 | FRC: in |
| 8 | BC: in after |
| 9 | SL: |
| 10 | SR: |
| 11 | TC: on |
| 12 | TFL: on left front |
| 13 | TFC: in before on |
| 14 | TFR: on right front |
| 15 | TBL: on left back |
| 16 | TBC: on the middle back |
| 17 | TBR: on right back |
| 18...31 | Keep |
Generally speaking, can maximum 32 loudspeakers be mapped to output audio signal.So as shown in table 1, loudspeaker map unit 813 can be mapped to corresponding to each digital loudspeaker (loudspeaker) sound signal to give multi-channel audio signal with the mode of (bsOutputChannelPos) specific in the numeral between 0 and 31.In this situation, because in 32 loudspeakers should be selected being mapped to loudspeaker from first sound signal the multi-channel audio signal of multichannel generation unit 811 outputs, so need 5 bits altogether.Because one in remaining 31 loudspeaker should be selected so that second sound signal is mapped to loudspeaker, so also need 5 bits.According to this method, because in remaining 16 loudspeaker should be selected so that the tenth seven tunes frequency signal map is arrived loudspeaker, so need 4 bits.Particularly, along with the number increase of the sound signal of shining upon, indication map just reduces to the required quantity of information of the loudspeaker of sound signal.This can be mapped to sound signal the ceil [log of the required bit number of loudspeaker by expression
2(32-bsOutputChannelPos)] express.Increase owing to treat the number of the sound signal of layout, required bit number reduces, the situation that this increases applicable to the down-mix audio signal number by 809 layouts of signal layout unit.Therefore, audio decoding apparatus is mapped to loudspeaker with multi-channel audio signal and exports corresponding signal then.
Although this paper describes and illustrated the present invention with reference to the preferred embodiments of the present invention, those skilled in the art will know and can make various modifications and distortion in the present invention and can not break away from the spirit and scope of the present invention.Therefore, the present invention is intended to contain modification of the present invention and the distortion that falls in accompanying claims and the come scope thereof.
[beneficial effect]
Therefore, by the devices and methods therefor that is used for decoded audio signal according to the present invention, can head optionally be included in the spatial signal information.
By the devices and methods therefor that is used for decoded audio signal according to the present invention, can reduce the data volume of transmission with the mode that is shown the location tables of the time slot that will apply parameter set variable number of bits.
By the devices and methods therefor that is used for decoded audio signal according to the present invention, can promote audio signal compression and transmission efficiency will carry out the down-mix audio signal layout or multichannel is mapped to the mode that the required apsi message of loudspeaker is shown minimum variable number of bits.
By the devices and methods therefor that is used for decoded audio signal according to the present invention; Can come to make sound signal compressed more expeditiously and transmits to carry out down-mix audio signal layout ground in order and not to the mode of carrying out the channel expansion audio mixing through core codec unit decodes and the signal that is sent to the multichannel generation unit, and the complexity of reduction audio signal decoder.
[accompanying drawing summary]
Fig. 1 is the arrangement plan of sound signal according to an embodiment of the invention.
Fig. 2 is the process flow diagram of the method that sound signal is decoded according to another embodiment of the invention.
Fig. 3 is the process flow diagram of the method that sound signal is decoded according to another embodiment of the invention.
Fig. 4 is the sentence structure of the positional information of the time slot that applies parameter set according to an embodiment of the invention.
Fig. 5 be according to another embodiment of the invention pass through parameter set is put on the decode process flow diagram of method of spatial signal information of time slot.
Fig. 6 and Fig. 7 are the synoptic diagram of the channel expansion audio mixing unit of audio signal decoder according to an embodiment of the invention.
Fig. 8 is the block diagram of audio signal decoder according to an embodiment of the invention.
[optimal mode]
In order to realize these and other advantage; According to an aspect of the present invention; A kind of method of decoded audio signal is provided; Comprise: receive the sound signal that comprises spatial signal information and down-mix audio signal; Utilization is included in the positional information that number of time slot and number of parameters in the sound signal obtain time slot, through the positional information according to time slot spatial signal information is put on down-mix audio signal and generates multi-channel audio signal, and multi-channel audio signal correspondingly is formatted to output channels.
Can the positional information of time slot be expressed as variable number of bits.And positional information can comprise initial value and difference, and wherein initial value indication applies the positional information of the time slot of first parameter, and wherein the difference indication will apply second or the positional information of the time slot of subsequent parameter.And can this initial value be expressed as at least one variable number of bits that decides of using in number of time slot and the number of parameters.And can this difference table be shown at least one variable number of bits that decides in the positional information of the time slot that uses number of time slot, number of parameters and apply last parameter.And the method also comprises the down-mix audio signal of down-mix audio signal layout one-tenth according to presetting method.And the layout down-mix audio signal can be done the down-mix audio signal execution that sound channel expansion audio mixing becomes the signal conversion unit of three signals with two down-mix audio signal to getting into.And if head is included in the spatial signal information, then the sound signal arrangement information in the configuration information that extracts in can using and being included in from the head of down-mix audio signal layout comes the layout down-mix audio signal.Shine upon the i sound signal or the required quantity of information of layout i down-mix audio signal can be to be equal to or greater than log
2The smallest positive integral of [(sound signal sum or down-mix audio signal sum)-(' i ' value)+1].And the layout of multi-channel audio signal can further comprise sound signal correspondingly is formatted to loudspeaker.
According to a further aspect in the invention; A kind of device that is used for decoded audio signal is provided, has comprised the multichannel layout unit that sound signal sound channel expansion audio mixing is become the channel expansion audio mixing unit of multi-channel audio signal and according to preset layout multi-channel audio signal is mapped to output channels.
According to a further aspect in the invention; A kind of device that is used for decoded audio signal is provided, has comprised through the down-mix audio signal core codec unit of decoding of coding, come layout through the layout unit of the sound signal of decoding and will make the channel expansion audio mixing unit that sound channel expansion audio mixing becomes multi-channel audio signal through the sound signal of layout according to preset layout.
Claims (6)
1. the method for a decoded audio signal, it comprises:
Reception comprises the sound signal of down-mix audio signal and spatial signal information;
When head is included in the said spatial signal information, from said head, extract configuration information;
Extraction is included in the spatial information in the said spatial signal information;
Utilize said configuration information and said spatial information to generate multi-channel audio signal from said down-mix audio signal; And
The loudspeaker map information that utilization is included in the said configuration information is mapped to loudspeaker with said multi-channel audio signal,
Wherein, the extraction of said spatial information comprises:
Extract frame identifier from said spatial signal information, the frame that said frame identifier indication is included in the said spatial signal information is anchor-frame or variable frame;
When said frame identifier indicates the frame that is included in the said spatial signal information to be variable frame, extract the positional information of the time slot that has applied parameter set; And
To applying said parameter set with the corresponding time slot position of said positional information,
Wherein:
The positional information of said time slot is represented as initial value or difference,
The positional information that is applied in the time slot of first parameter set is represented as said initial value,
Be applied in second or the positional information of the time slot of subsequent parameter collection be represented as said difference, and
Said difference be applied in the parameter current collection time slot the position and be applied in poor between the position of time slot of last parameter set.
2. the method for claim 1 is characterized in that, also comprises when said head is not included in the said spatial signal information, extracts said configuration information in the included head of before front space information signal.
3. the method for claim 1 is characterized in that, also comprises in said spatial signal information mistake takes place, and then corrects the mistake of said spatial information.
4. the device of a decoded audio signal comprises:
Receiving element, its reception comprises the sound signal of down-mix audio signal and spatial signal information;
The spatial information decoding unit, it extracts configuration information from said head when head is included in the spatial signal information, and extracts the spatial information that comprises in the said spatial signal information;
The multichannel generation unit, it uses said configuration information and said spatial information to generate multi-channel audio signal from said down-mix audio signal; And
The loudspeaker map information that loudspeaker map unit, its use are included in the said configuration information maps to loudspeaker with said multi-channel audio signal,
Wherein, said spatial information decoding unit is further: extract frame identifier from said spatial signal information; When said frame identifier indicates the frame that is included in the said spatial signal information to be variable frame, extract the positional information of the time slot that has applied parameter set; And a time slot position applied said parameter set,
Wherein:
The frame that said frame identifier indication is included in the said spatial signal information is anchor-frame or variable frame,
The positional information of said time slot is represented as initial value or difference,
The positional information that is applied in the time slot of first parameter set is represented as said initial value,
Be applied in second or the positional information of the time slot of subsequent parameter collection be represented as said difference, and
Said difference be applied in the parameter current collection time slot the position and be applied in poor between the position of time slot of last parameter set, and
Said time slot position is corresponding to said positional information.
5. device as claimed in claim 4 is characterized in that, extracts said configuration information in the included head of said spatial information decoding unit before front space information signal when said head is not included in the said spatial signal information.
6. device as claimed in claim 4 is characterized in that, the mistake of correcting said spatial information when said spatial information decoding unit in said spatial signal information mistake takes place.
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| KR1020060056480 | 2006-06-22 | ||
| KR10-2006-0056480 | 2006-06-22 | ||
| KR1020060056480A KR20070003574A (en) | 2005-06-30 | 2006-06-22 | Method and apparatus for encoding and decoding an audio signal |
| PCT/KR2006/003436 WO2007027057A1 (en) | 2005-08-30 | 2006-08-30 | A method for decoding an audio signal |
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| CN2006800314619A Active CN101253551B (en) | 2005-08-30 | 2006-08-30 | Method and apparatus for encoding and decoding an audio signal |
| CN2006800316690A Active CN101253554B (en) | 2005-08-30 | 2006-08-30 | Method and device for decoding an audio signal |
| CN2006800316192A Expired - Fee Related CN101253810B (en) | 2005-08-30 | 2006-08-30 | Method and apparatus for encoding and decoding an audio signal |
| CN200680031572XA Active CN101253809B (en) | 2005-08-30 | 2006-08-30 | Method and apparatus for encoding and decoding an audio signal |
| CN200680031480.1A Expired - Fee Related CN101253806B (en) | 2005-08-30 | 2006-08-30 | Method and apparatus for encoding and decoding an audio signal |
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| CN101930738B (en) * | 2009-06-18 | 2012-05-23 | 晨星软件研发(深圳)有限公司 | Multi-track audio signal decoding method and device |
| CN102025393B (en) * | 2009-09-09 | 2013-08-14 | 华为技术有限公司 | Data transmission method and device |
| US8428936B2 (en) * | 2010-03-05 | 2013-04-23 | Motorola Mobility Llc | Decoder for audio signal including generic audio and speech frames |
| US8605564B2 (en) * | 2011-04-28 | 2013-12-10 | Mediatek Inc. | Audio mixing method and audio mixing apparatus capable of processing and/or mixing audio inputs individually |
| CN102419978B (en) * | 2011-08-23 | 2013-03-27 | 展讯通信（上海）有限公司 | Audio decoder and frequency spectrum reconstructing method and device for audio decoding |
| TWM487509U (en) | 2013-06-19 | 2014-10-01 | 杜比實驗室特許公司 | Audio processing apparatus and electrical device |
| EP2830334A1 (en) | 2013-07-22 | 2015-01-28 | Fraunhofer-Gesellschaft zur Förderung der angewandten Forschung e.V. | Multi-channel audio decoder, multi-channel audio encoder, methods, computer program and encoded audio representation using a decorrelation of rendered audio signals |
| SG11201600466PA (en) * | 2013-07-22 | 2016-02-26 | Fraunhofer Ges Forschung | Multi-channel audio decoder, multi-channel audio encoder, methods, computer program and encoded audio representation using a decorrelation of rendered audio signals |
| CN117767898A (en) | 2013-09-12 | 2024-03-26 | 杜比实验室特许公司 | Dynamic range control for various playback environments |
| CN105898669B (en) * | 2016-03-18 | 2017-10-20 | 南京青衿信息科技有限公司 | A kind of coding method of target voice |
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| CN101253552A (en) | 2008-08-27 |
| CN101253554A (en) | 2008-08-27 |
| CN101253553A (en) | 2008-08-27 |
| KR20070025905A (en) | 2007-03-08 |
| CN101253551B (en) | 2012-11-28 |
| CN101253806A (en) | 2008-08-27 |
| CN101253809B (en) | 2011-12-28 |
| CN101253807A (en) | 2008-08-27 |
| CN101253808B (en) | 2012-05-23 |
| CN101253806B (en) | 2015-05-13 |
| CN101253810B (en) | 2011-12-14 |
| CN101253554B (en) | 2011-12-07 |
| CN101253807B (en) | 2014-04-02 |
| CN101253810A (en) | 2008-08-27 |
| CN101248484A (en) | 2008-08-20 |
| CN101253551A (en) | 2008-08-27 |
| CN101248484B (en) | 2012-06-13 |
| CN101253808A (en) | 2008-08-27 |
| CN101253552B (en) | 2013-04-03 |
| CN101253809A (en) | 2008-08-27 |
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