US20010012441A1 - Multi-angle digital and audio synchronization recording and playback apparatus and method - Google Patents
Multi-angle digital and audio synchronization recording and playback apparatus and method Download PDFInfo
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- US20010012441A1 US20010012441A1 US08/978,141 US97814197A US2001012441A1 US 20010012441 A1 US20010012441 A1 US 20010012441A1 US 97814197 A US97814197 A US 97814197A US 2001012441 A1 US2001012441 A1 US 2001012441A1
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- G—PHYSICS
- G11—INFORMATION STORAGE
- G11B—INFORMATION STORAGE BASED ON RELATIVE MOVEMENT BETWEEN RECORD CARRIER AND TRANSDUCER
- G11B20/00—Signal processing not specific to the method of recording or reproducing; Circuits therefor
- G11B20/10—Digital recording or reproducing
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
- H04N5/00—Details of television systems
- H04N5/76—Television signal recording
- H04N5/91—Television signal processing therefor
- H04N5/92—Transformation of the television signal for recording, e.g. modulation, frequency changing; Inverse transformation for playback
- H04N5/9201—Transformation of the television signal for recording, e.g. modulation, frequency changing; Inverse transformation for playback involving the multiplexing of an additional signal and the video signal
- H04N5/9205—Transformation of the television signal for recording, e.g. modulation, frequency changing; Inverse transformation for playback involving the multiplexing of an additional signal and the video signal the additional signal being at least another television signal
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
- H04N5/00—Details of television systems
- H04N5/76—Television signal recording
- H04N5/91—Television signal processing therefor
- H04N5/92—Transformation of the television signal for recording, e.g. modulation, frequency changing; Inverse transformation for playback
- H04N5/926—Transformation of the television signal for recording, e.g. modulation, frequency changing; Inverse transformation for playback by pulse code modulation
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
- H04N5/00—Details of television systems
- H04N5/76—Television signal recording
- H04N5/91—Television signal processing therefor
- H04N5/92—Transformation of the television signal for recording, e.g. modulation, frequency changing; Inverse transformation for playback
- H04N5/926—Transformation of the television signal for recording, e.g. modulation, frequency changing; Inverse transformation for playback by pulse code modulation
- H04N5/9265—Transformation of the television signal for recording, e.g. modulation, frequency changing; Inverse transformation for playback by pulse code modulation with processing of the sound signal
Definitions
- the present invention relates to a digital video playback apparatus in a digital video device and method therefor, and more particularly, to a digital video playback apparatus for playing-back the video and audio signals that have been recorded by using a plurality of cameras at different angles and method therefor.
- a camera is set in front of an object and four microphones SL (Surround Left), SR (Surround Right), FL (Front Left), and FR (Front Right) are set surrounding the object to secure the presence of the sounds.
- the audio and video signals from the camera and the microphones are recorded, on a recording medium such as a disc, by a known video recorder illustrated in FIG. 2.
- a multiplexer (MUX) 14 receives system information which includes the number of video blocks, the number of audio blocks, a start address for each of the video blocks, and a start address for each of the audio blocks.
- a video encoder 10 converts an analog video signal input into digital video data, and formats the digital video data in a predetermined manner. The video data output from the video encoder 10 are applied to the multiplexer 14 .
- An audio encoder 12 converts the 4-channel analog audio signals FL, FR, SL and SR from the microphones into digital audio data, and formats the digital audio data in a predetermined manner. The audio data output from the audio encoder 12 is transferred to the multiplexer 14 . As illustrated in FIG. 3, the multiplexer 14 generates by turn the system information, the video data, and the audio data.
- a digital recorder 16 records, by turn, the system information, the video data, and the audio data on the recording medium.
- FIG. 4 illustrates a conventional video playback apparatus for playing-back the audio and video data recorded as shown in FIG. 3.
- a digital playback apparatus 20 reads out video and audio data which are compressed and recorded on the recording medium such as a disc. The read video and audio data undergo an error correction and deinterleaving process.
- a demultiplexer (DMUX) 22 separates a signal output of the digital playback apparatus 20 into the system information, the video data, and the audio data.
- a video decoder 24 decodes compressed video stream data output from the demultiplexer 22 , to expand the compressed video stream data.
- the video decoder 24 may be realized by a chip CL480 or CL9100 manufactured by C-Cube Co.
- An NTSC (National Television System Committee) encoder 26 encodes a video signal output from the video decoder 24 into an NTSC video signal.
- the NTSC encoder 26 may be realized by a chip CXA1145P manufactured by Sony Co., or a chip KA2194D manufactured by Samsung Electronics Co.
- An audio decoder 28 decodes the compressed audio stream data output from the demultiplexer 22 , to expand the compressed audio stream data into the 4-channel audio data.
- a digital-to-analog converter and amplifier 29 converts the expanded 4-channel audio data from the audio decoder 28 into the original 4-channel analog audio signals FL, FR, SL and SR, and amplifies the converted 4-channel analog audio signals.
- a video playback apparatus reproduces the video signal from only one camera, it is not possible to reproduce a video signal from another camera at a different angle.
- a digital video playback apparatus which includes a digital playback apparatus to read out first and second video steam data and audio stream data, which are compressed and recorded on a recording medium, the first and second video stream data and the audio stream data undergoing an error correction and deinterleaving process; a demultiplexer to separate a signal output of the digital playback apparatus into system information, the first and second video stream data, and the audio stream data; first and second video decoders to expand the first and second compressed video stream data outputs from the demultiplexer, respectively; an audio decoder to decode and expand the audio stream data output from the demultiplexer; a key input section to generate first and second angle selection signals; a controller to analyze the system information from the demultiplexer and the angle selection signals from the key input section, to generate a switching control signal, a plurality of delay time control signals, and a plurality of gain control signals; a switch to select the first and second video stream data outputs from the first and second
- FIG. 3 is a diagram for showing a data stream recorded on a recording medium according to the conventional video recording apparatus shown in FIG. 2;
- FIG. 6 is a block diagram of a video recording apparatus according to the embodiment of the present invention.
- FIG. 7 is a block diagram of a video playback apparatus according to the embodiment of the present invention.
- FIG. 8 is a diagram of a delay time and gain control circuit according to the embodiment of the present invention.
- FIG. 10 is a flow chart for selectively reproducing video signals from a plurality of cameras at different angles according to the embodiment of the present invention.
- a telerecording system includes at least two cameras CA 1 and CA 2 at different angles and four microphones M 1 -M 4 , in which the microphone Ml is set on the front left side of an object, the microphone M 2 is set on the front right side of the object, the microphone M 3 is set on the rear left side of the object, and the microphone M 4 is set on the rear right side of the object. It should be understood that the number of the cameras may be freely varied at the user's discretion.
- a video recording apparatus includes first and second video encoders 30 and 32 , an audio encoder 34 , a multiplexer 38 , and a digital recorder 40 .
- a video playback apparatus includes a digital playback apparatus 42 to read out first and second video stream data, and audio stream data, which are compressed and recorded on a recording medium.
- the read video and audio stream data undergo an error correction and deinterleaving process.
- a demultiplexer 44 separates a signal output of the digital playback apparatus 42 into the system information, the first and second video stream data, and the audio stream data.
- First and second video decoders 46 and 48 expand the first and second compressed video stream data from the demultiplexer 44 , respectively.
- the audio decoder 50 decodes and expands the compressed audio stream data from the demultiplexer 44 and outputs expanded 4-channel audio stream data.
- the NTSC encoder 58 may be realized by a chip CXA1145P manufactured by Sony Co., or a chip KA2194D manufactured by Samsung Electronics Co.
- a delay time and gain control circuit 52 delays and controls a gain of the decoded 4-channel audio data output from the audio encoder 50 .
- a digital-to-analog converter and amplifier 60 converts the 4-channel audio stream data output from the delay time and gain control circuit 52 into the original 4-channel analog audio signals, and amplifies the 4-channel analog audio signals.
- the digital playback apparatus 42 reads out the first and second video stream data and the audio stream data, which are compressed and recorded on the recording medium such as a disc.
- the read video and audio stream data undergo an error correction and deinterleaving process.
- the demultiplexer 44 separates a signal output of the digital playback apparatus 42 into the system information, the first and second video stream data, and the audio stream data.
- the first video decoder 46 expands the first compressed video stream data output from the demultiplexer 44 .
- the second video decoder 48 expands the second compressed video stream data output from the demultiplexer 44 .
- the first and second video decoders 46 and 48 may be realized by a chip CL480 or a chip CL9100 manufactured by C-Cube Co.
- the audio decoder 50 decodes the compressed audio stream data output from the demultiplexer 44 , to expand the compressed audio stream data into the 4-channel audio data.
- the NTSC encoder 58 encodes a video signal output from the first video decoder 46 into an NTSC video signal. Further, the 4-channel audio stream data output from the audio decoder 50 is transferred to the delay time and gain control circuit 52 .
- the delay time and gain control circuit 52 delays the 4-channel audio stream data outputs from the audio decoder 50 with different delay times according to associated delay time control signals, and controls the gains of the delayed audio stream data according to associated gain control signals. Then, at a step 105 , the controller 62 analyzes video angle information to generate the delay time control signals and the gain control signals to the delay time and gain control circuit 52 .
- the first delay 70 delays the front left channel audio stream data FL by a predetermined time (for example, 0 ms), according to the associated delay time control signal from the controller 62 .
- the second delay 72 delays the front right channel audio stream data FR by a predetermined time (for example, 5 ms), according to the associated delay time control signal from the controller 62 .
- the third delay 74 delays the rear (or surround) left channel audio stream data SL by a predetermined time (for example, 10 ms), according to the associated delay time control signal from the controller 62 .
- the fourth delay 76 delays the rear (or surround) right channel audio stream data SR by a predetermined time (for example, 15 ms), according to the associated delay time control signal from the controller 62 .
- the first multiplier 78 multiplies the gain of the front left channel audio stream data FL from the first delay 70 by a gain coefficient ‘1’ according to the associated gain control signal from the controller 62 .
- the second multiplier 80 multiplies the gain of the front right channel audio stream data FR from the second delay 72 by a gain coefficient ‘0.8’ according to the associated gain control signal from the controller 62 .
- the third multiplier 82 multiplies the gain of the rear left channel audio stream data SL from the second delay 74 by a gain coefficient ‘0.5’ according to the associated gain control signal from the controller 62 .
- the fourth multiplier 84 multiplies the gain of the rear right channel audio stream data SR from the second delay 76 by a gain coefficient ‘0.3’ according to the associated gain control signal from the controller 62 .
- the gain controlled 4-channel audio stream data outputs are transferred to the digital-to-analog converter and amplifier 60 .
- the digital-to-analog converter and amplifier 60 converts the 4-channel audio stream data generated from the delay time and gain control circuit 52 into the 4-channel analog audio signals, and amplifies the converted 4-channel analog audio signals.
- the procedure goes to the step 105 to delay and control the gain of the 4-channel audio stream data outputs of the audio decoder 50 , in a similar fashion as described above.
- the delays 70 , 72 , 74 and 76 delay the respective channel audio stream data by predetermined amounts which are different from the instance when the first angle selection key is depressed, according to the associated delay time control signals from the controller 62 .
- the delay times for the delays 70 , 72 , 74 and 76 are 5, 0, 15 and 10 ms, respectively.
- the multipliers 78 , 80 , 82 and 84 multiply the gains of the respective channel audio stream data according to the associated gain control signal from the controller 62 , the gain coefficients being different from the instance that the first angle selection key is depressed.
- the gain coefficients for the multipliers 78 , 80 , 82 and 84 are ‘0.8’, ‘1.0’, ‘0.3’ and ‘0.5’, respectively.
- the audio signals can be reproduced differently according to the depression of the first angle selection key or the second angle selection key by the user. That is, the 4-channel audio data based on the first angle selection key depressed by the user and the 4-channel audio data based on the second angle selection key depressed by the user are different from each other by channels.
- the video playback apparatus of the invention can selectively reproduce video signals which are recorded on a recording medium by using a plurality of cameras each at different angles.
- the user may selectively watch the videos at different angles together with the associated real sounds.
Abstract
Description
- 1. Field of the Invention
- The present invention relates to a digital video playback apparatus in a digital video device and method therefor, and more particularly, to a digital video playback apparatus for playing-back the video and audio signals that have been recorded by using a plurality of cameras at different angles and method therefor.
- 2. Description of the Related Art
- As illustrated in FIG. 1, in the case of taking a motion picture or a music video, a camera is set in front of an object and four microphones SL (Surround Left), SR (Surround Right), FL (Front Left), and FR (Front Right) are set surrounding the object to secure the presence of the sounds. The audio and video signals from the camera and the microphones are recorded, on a recording medium such as a disc, by a known video recorder illustrated in FIG. 2.
- Referring to FIG. 2, a multiplexer (MUX)14 receives system information which includes the number of video blocks, the number of audio blocks, a start address for each of the video blocks, and a start address for each of the audio blocks. A
video encoder 10 converts an analog video signal input into digital video data, and formats the digital video data in a predetermined manner. The video data output from thevideo encoder 10 are applied to themultiplexer 14. Anaudio encoder 12 converts the 4-channel analog audio signals FL, FR, SL and SR from the microphones into digital audio data, and formats the digital audio data in a predetermined manner. The audio data output from theaudio encoder 12 is transferred to themultiplexer 14. As illustrated in FIG. 3, themultiplexer 14 generates by turn the system information, the video data, and the audio data. Adigital recorder 16 records, by turn, the system information, the video data, and the audio data on the recording medium. - FIG. 4 illustrates a conventional video playback apparatus for playing-back the audio and video data recorded as shown in FIG. 3. As illustrated, a
digital playback apparatus 20 reads out video and audio data which are compressed and recorded on the recording medium such as a disc. The read video and audio data undergo an error correction and deinterleaving process. A demultiplexer (DMUX) 22 separates a signal output of thedigital playback apparatus 20 into the system information, the video data, and the audio data. Avideo decoder 24 decodes compressed video stream data output from thedemultiplexer 22, to expand the compressed video stream data. Thevideo decoder 24 may be realized by a chip CL480 or CL9100 manufactured by C-Cube Co. An NTSC (National Television System Committee)encoder 26 encodes a video signal output from thevideo decoder 24 into an NTSC video signal. TheNTSC encoder 26 may be realized by a chip CXA1145P manufactured by Sony Co., or a chip KA2194D manufactured by Samsung Electronics Co. Anaudio decoder 28 decodes the compressed audio stream data output from thedemultiplexer 22, to expand the compressed audio stream data into the 4-channel audio data. A digital-to-analog converter andamplifier 29 converts the expanded 4-channel audio data from theaudio decoder 28 into the original 4-channel analog audio signals FL, FR, SL and SR, and amplifies the converted 4-channel analog audio signals. However, since such a video playback apparatus reproduces the video signal from only one camera, it is not possible to reproduce a video signal from another camera at a different angle. - It is therefore an object of the present invention to provide a digital video playback apparatus capable of selectively reproducing video signals which are recorded by using a plurality of cameras each at different angles.
- Additional objects and advantages of the invention will be set forth in part in the description which follows and, in part, will be obvious from the description, or may be learned by practice of the invention.
- The above and other objects of the present invention are achieved by providing a digital video playback apparatus which includes a digital playback apparatus to read out first and second video steam data and audio stream data, which are compressed and recorded on a recording medium, the first and second video stream data and the audio stream data undergoing an error correction and deinterleaving process; a demultiplexer to separate a signal output of the digital playback apparatus into system information, the first and second video stream data, and the audio stream data; first and second video decoders to expand the first and second compressed video stream data outputs from the demultiplexer, respectively; an audio decoder to decode and expand the audio stream data output from the demultiplexer; a key input section to generate first and second angle selection signals; a controller to analyze the system information from the demultiplexer and the angle selection signals from the key input section, to generate a switching control signal, a plurality of delay time control signals, and a plurality of gain control signals; a switch to select the first and second video stream data outputs from the first and second video decoders according to the switching control signal; and a delay time and gain control circuit to delay the 4-channel audio stream data outputs from the audio decoder according to the delay time control signals, and control gains of the delayed 4-channel audio stream data according to the gain control signals.
- The above and other objects, features and advantages of the present invention will become more apparent in the light of the following detailed description of an exemplary embodiment thereof taken with the attached drawings in which:
- FIG. 1 is a schematic diagram for showing an arrangement of a camera and microphones in a conventional telerecording (video and audio data) system;
- FIG. 2 is a block diagram of a conventional video recording apparatus to record video and audio data in accordance with the system shown in FIG. 1;
- FIG. 3 is a diagram for showing a data stream recorded on a recording medium according to the conventional video recording apparatus shown in FIG. 2;
- FIG. 4 is a block diagram of a conventional video playback apparatus in accordance with the system shown in FIG. 1;
- FIG. 5 is a schematic diagram for showing an arrangement of cameras and microphones in a telerecording system according to an embodiment of the present invention;
- FIG. 6 is a block diagram of a video recording apparatus according to the embodiment of the present invention;
- FIG. 7 is a block diagram of a video playback apparatus according to the embodiment of the present invention;
- FIG. 8 is a diagram of a delay time and gain control circuit according to the embodiment of the present invention;
- FIG. 9 is a diagram for showing a data stream recorded on a recording medium according to the embodiment of the present invention; and
- FIG. 10 is a flow chart for selectively reproducing video signals from a plurality of cameras at different angles according to the embodiment of the present invention.
- A preferred embodiment of the present invention will be described in detail hereinbelow with reference to the attached drawings.
- Referring to FIG. 5, a telerecording system according to an embodiment of the present invention includes at least two cameras CA1 and CA2 at different angles and four microphones M1-M4, in which the microphone Ml is set on the front left side of an object, the microphone M2 is set on the front right side of the object, the microphone M3 is set on the rear left side of the object, and the microphone M4 is set on the rear right side of the object. It should be understood that the number of the cameras may be freely varied at the user's discretion.
- Referring to FIG. 6, a video recording apparatus according to the embodiment of the present invention includes first and
second video encoders audio encoder 34, amultiplexer 38, and adigital recorder 40. - Referring to FIG. 7, a video playback apparatus according to the embodiment of the present invention includes a
digital playback apparatus 42 to read out first and second video stream data, and audio stream data, which are compressed and recorded on a recording medium. The read video and audio stream data undergo an error correction and deinterleaving process. Ademultiplexer 44 separates a signal output of thedigital playback apparatus 42 into the system information, the first and second video stream data, and the audio stream data. First andsecond video decoders demultiplexer 44, respectively. Theaudio decoder 50 decodes and expands the compressed audio stream data from thedemultiplexer 44 and outputs expanded 4-channel audio stream data. Akey input section 64 includes first and second angle selection keys to generate first and second angle selection signals. Acontroller 62 analyzes the system information generated from thedemultiplexer 44. Further, thecontroller 62 generates a switching control signal and a plurality of delay time control signals and a plurality of gain control signals according to the first and second angle selection signals generated from thekey input section 64. A switch 54 selects one of the first and second video stream data outputs from the first andsecond video decoders controller 62. AnNTSC encoder 58 encodes the video data selected by the switch 54 into an NTSC video signal. TheNTSC encoder 58 may be realized by a chip CXA1145P manufactured by Sony Co., or a chip KA2194D manufactured by Samsung Electronics Co. A delay time andgain control circuit 52 delays and controls a gain of the decoded 4-channel audio data output from theaudio encoder 50. A digital-to-analog converter andamplifier 60 converts the 4-channel audio stream data output from the delay time andgain control circuit 52 into the original 4-channel analog audio signals, and amplifies the 4-channel analog audio signals. - Referring to FIG. 8, the delay time and
gain control circuit 52 according to the embodiment of the present invention includes first tofourth delays fourth multipliers fourth delays fourth multipliers fourth delays controller 62. - FIG. 9 illustrates the data stream recorded on a recording medium according to the embodiment of the present invention, in which the system information, the first and second video stream data, and the audio stream data are arranged in order. The system information according to the embodiment of the present invention includes synchronization data, the number of angles, the number of video blocks, the number of audio blocks, a start address of each video block, and a start address of each audio block.
- Now, referring to FIGS. 5 through 10, a detailed description will be made of the operation of the embodiment of the invention. The
multiplexer 38 receives the system information shown in FIG. 9. Thefirst video encoder 30 converts an analog video signal output from the first camera CA1 into digital video data (first video stream data), and formats the digital video data (first video stream data) in a predetermined manner. Thesecond video encoder 32 converts an analog video signal output from the second camera CA2 into the digital video data (second video data), and formats the digital video data (second video stream data) in a predetermined manner. Theaudio encoder 34 converts the 4-channel audio signals FL, FR, SL, and SR from the microphones M1-M4 into digital audio data (audio stream data), and formats the digital audio data in a predetermined manner. Themultiplexer 38 sequentially generates the system information, the first and second video stream data, and the audio steam data, as shown in FIG. 9. Thedigital recorder 40 sequentially records on the recording medium the system information, the first and second video stream data, and the audio stream data, from themultiplexer 38. - Referring again to FIG. 7, the
digital playback apparatus 42 reads out the first and second video stream data and the audio stream data, which are compressed and recorded on the recording medium such as a disc. The read video and audio stream data undergo an error correction and deinterleaving process. Thedemultiplexer 44 separates a signal output of thedigital playback apparatus 42 into the system information, the first and second video stream data, and the audio stream data. Thefirst video decoder 46 expands the first compressed video stream data output from thedemultiplexer 44. Thesecond video decoder 48 expands the second compressed video stream data output from thedemultiplexer 44. The first andsecond video decoders audio decoder 50 decodes the compressed audio stream data output from thedemultiplexer 44, to expand the compressed audio stream data into the 4-channel audio data. - At the moment, if a user depresses the first or second angle selection key prepared on the
key input section 64 to generate the first or second angle selection signal, thecontroller 62 generates the switching control signal to control the switch 54. With reference to FIG. 10, thecontroller 62 analyzes, at astep 101, the system information to check whether the number of angles is one or not. If the number of the angles is one, thecontroller 62 generates the switching control signal of a first logic state to switch a common terminal of the switch 54 to a terminal “A” thereof, at astep 102. Then, the first video stream data output from thefirst video decoder 46 is transferred to theNTSC encoder 58. TheNTSC encoder 58 encodes a video signal output from thefirst video decoder 46 into an NTSC video signal. Further, the 4-channel audio stream data output from theaudio decoder 50 is transferred to the delay time and gaincontrol circuit 52. The delay time and gaincontrol circuit 52 delays the 4-channel audio stream data outputs from theaudio decoder 50 with different delay times according to associated delay time control signals, and controls the gains of the delayed audio stream data according to associated gain control signals. Then, at astep 105, thecontroller 62 analyzes video angle information to generate the delay time control signals and the gain control signals to the delay time and gaincontrol circuit 52. - Referring to FIG. 8, in case of reproducing the first video stream data that is recorded by using the first camera CA1, the
first delay 70 delays the front left channel audio stream data FL by a predetermined time (for example, 0 ms), according to the associated delay time control signal from thecontroller 62. Thesecond delay 72 delays the front right channel audio stream data FR by a predetermined time (for example, 5 ms), according to the associated delay time control signal from thecontroller 62. Thethird delay 74 delays the rear (or surround) left channel audio stream data SL by a predetermined time (for example, 10 ms), according to the associated delay time control signal from thecontroller 62. Finally, thefourth delay 76 delays the rear (or surround) right channel audio stream data SR by a predetermined time (for example, 15 ms), according to the associated delay time control signal from thecontroller 62. Then, thefirst multiplier 78 multiplies the gain of the front left channel audio stream data FL from thefirst delay 70 by a gain coefficient ‘1’ according to the associated gain control signal from thecontroller 62. Thesecond multiplier 80 multiplies the gain of the front right channel audio stream data FR from thesecond delay 72 by a gain coefficient ‘0.8’ according to the associated gain control signal from thecontroller 62. Thethird multiplier 82 multiplies the gain of the rear left channel audio stream data SL from thesecond delay 74 by a gain coefficient ‘0.5’ according to the associated gain control signal from thecontroller 62. Thefourth multiplier 84 multiplies the gain of the rear right channel audio stream data SR from thesecond delay 76 by a gain coefficient ‘0.3’ according to the associated gain control signal from thecontroller 62. The gain controlled 4-channel audio stream data outputs are transferred to the digital-to-analog converter andamplifier 60. The digital-to-analog converter andamplifier 60 converts the 4-channel audio stream data generated from the delay time and gaincontrol circuit 52 into the 4-channel analog audio signals, and amplifies the converted 4-channel analog audio signals. - However, if the number of the angles is not one at the
step 101, thecontroller 62 will check at astep 103 whether or not the user has depressed the second angle selection key of thekey input section 64. If the first angle selection key is depressed, the process proceeds to step 102 and this step is performed as set forth above. If the second angle selection key is depressed, thecontroller 62 generates the switching control signal of a second logic state to switch the common terminal of the switch 54 to a terminal “B” thereof, at astep 104. Then, the second video stream data output from thesecond video decoder 48 is transferred to theNTSC encoder 58. Thus, the video playback apparatus reproduces the second video stream data that is recorded by using the second camera CA2. Then, the procedure goes to thestep 105 to delay and control the gain of the 4-channel audio stream data outputs of theaudio decoder 50, in a similar fashion as described above. Namely, thedelays controller 62. In this instance, the delay times for thedelays multipliers controller 62, the gain coefficients being different from the instance that the first angle selection key is depressed. Here, the gain coefficients for themultipliers - Thus, in the present invention, the audio signals can be reproduced differently according to the depression of the first angle selection key or the second angle selection key by the user. That is, the 4-channel audio data based on the first angle selection key depressed by the user and the 4-channel audio data based on the second angle selection key depressed by the user are different from each other by channels.
- By delaying and gain controlling the4-channel audio data, it is possible to differently reproduce the sounds of an object (e.g., actor or musician) respectively input to the microphones M1-M4, according to the cameras situated at different angles. Thus, when a musician is singing a song, moving his location, for example, the sound level of the musician which is input to the microphones M1-M4 is respectively different. To reproduce the sound level input thereto, the delays and gains should be changed accordingly.
- As can be appreciated from the foregoing descriptions, the video playback apparatus of the invention can selectively reproduce video signals which are recorded on a recording medium by using a plurality of cameras each at different angles. Thus, the user may selectively watch the videos at different angles together with the associated real sounds.
- Although a preferred embodiment of the present invention has been described in detail hereinabove, it should be clearly understood that many variations and/or modifications of the basic inventive concepts herein taught which may appear to those skilled in the art will still fall within the spirit and scope of the present invention as defined in the appended claims.
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- 1997-10-29 JP JP9297539A patent/JPH10164514A/en active Pending
- 1997-11-03 DE DE69727647T patent/DE69727647T2/en not_active Expired - Lifetime
- 1997-11-03 EP EP97308802A patent/EP0845903B1/en not_active Expired - Lifetime
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EP0845903A2 (en) | 1998-06-03 |
CN1110808C (en) | 2003-06-04 |
KR19980039846A (en) | 1998-08-17 |
DE69727647D1 (en) | 2004-03-25 |
DE69727647T2 (en) | 2009-09-24 |
JPH10164514A (en) | 1998-06-19 |
EP0845903A3 (en) | 1999-09-22 |
EP0845903B1 (en) | 2004-02-18 |
KR100238668B1 (en) | 2000-01-15 |
US6430361B2 (en) | 2002-08-06 |
CN1184313A (en) | 1998-06-10 |
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