WO2007007916A1 - Transmitting apparatus and method capable of generating a warning depending on sound types - Google Patents

Transmitting apparatus and method capable of generating a warning depending on sound types Download PDF

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Publication number
WO2007007916A1
WO2007007916A1 PCT/JP2006/314321 JP2006314321W WO2007007916A1 WO 2007007916 A1 WO2007007916 A1 WO 2007007916A1 JP 2006314321 W JP2006314321 W JP 2006314321W WO 2007007916 A1 WO2007007916 A1 WO 2007007916A1
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WO
WIPO (PCT)
Prior art keywords
sound
ambient
alarm
ambient sound
types
Prior art date
Application number
PCT/JP2006/314321
Other languages
French (fr)
Inventor
Yu-Han Chiu
Chien-Ming Wu
Koichiro Mizushima
Original Assignee
Matsushita Electric Industrial Co., Ltd.
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Matsushita Electric Industrial Co., Ltd. filed Critical Matsushita Electric Industrial Co., Ltd.
Publication of WO2007007916A1 publication Critical patent/WO2007007916A1/en

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Classifications

    • G—PHYSICS
    • G08—SIGNALLING
    • G08B—SIGNALLING OR CALLING SYSTEMS; ORDER TELEGRAPHS; ALARM SYSTEMS
    • G08B1/00—Systems for signalling characterised solely by the form of transmission of the signal
    • G08B1/08—Systems for signalling characterised solely by the form of transmission of the signal using electric transmission ; transformation of alarm signals to electrical signals from a different medium, e.g. transmission of an electric alarm signal upon detection of an audible alarm signal
    • G—PHYSICS
    • G10—MUSICAL INSTRUMENTS; ACOUSTICS
    • G10K—SOUND-PRODUCING DEVICES; METHODS OR DEVICES FOR PROTECTING AGAINST, OR FOR DAMPING, NOISE OR OTHER ACOUSTIC WAVES IN GENERAL; ACOUSTICS NOT OTHERWISE PROVIDED FOR
    • G10K11/00—Methods or devices for transmitting, conducting or directing sound in general; Methods or devices for protecting against, or for damping, noise or other acoustic waves in general
    • G10K11/16—Methods or devices for protecting against, or for damping, noise or other acoustic waves in general
    • G10K11/175—Methods or devices for protecting against, or for damping, noise or other acoustic waves in general using interference effects; Masking sound
    • G10K11/178—Methods or devices for protecting against, or for damping, noise or other acoustic waves in general using interference effects; Masking sound by electro-acoustically regenerating the original acoustic waves in anti-phase
    • G10K11/1781—Methods or devices for protecting against, or for damping, noise or other acoustic waves in general using interference effects; Masking sound by electro-acoustically regenerating the original acoustic waves in anti-phase characterised by the analysis of input or output signals, e.g. frequency range, modes, transfer functions
    • G10K11/17821—Methods or devices for protecting against, or for damping, noise or other acoustic waves in general using interference effects; Masking sound by electro-acoustically regenerating the original acoustic waves in anti-phase characterised by the analysis of input or output signals, e.g. frequency range, modes, transfer functions characterised by the analysis of the input signals only
    • G10K11/17823—Reference signals, e.g. ambient acoustic environment
    • G—PHYSICS
    • G10—MUSICAL INSTRUMENTS; ACOUSTICS
    • G10K—SOUND-PRODUCING DEVICES; METHODS OR DEVICES FOR PROTECTING AGAINST, OR FOR DAMPING, NOISE OR OTHER ACOUSTIC WAVES IN GENERAL; ACOUSTICS NOT OTHERWISE PROVIDED FOR
    • G10K11/00—Methods or devices for transmitting, conducting or directing sound in general; Methods or devices for protecting against, or for damping, noise or other acoustic waves in general
    • G10K11/16—Methods or devices for protecting against, or for damping, noise or other acoustic waves in general
    • G10K11/175—Methods or devices for protecting against, or for damping, noise or other acoustic waves in general using interference effects; Masking sound
    • G10K11/178—Methods or devices for protecting against, or for damping, noise or other acoustic waves in general using interference effects; Masking sound by electro-acoustically regenerating the original acoustic waves in anti-phase
    • G10K11/1783—Methods or devices for protecting against, or for damping, noise or other acoustic waves in general using interference effects; Masking sound by electro-acoustically regenerating the original acoustic waves in anti-phase handling or detecting of non-standard events or conditions, e.g. changing operating modes under specific operating conditions
    • G—PHYSICS
    • G10—MUSICAL INSTRUMENTS; ACOUSTICS
    • G10K—SOUND-PRODUCING DEVICES; METHODS OR DEVICES FOR PROTECTING AGAINST, OR FOR DAMPING, NOISE OR OTHER ACOUSTIC WAVES IN GENERAL; ACOUSTICS NOT OTHERWISE PROVIDED FOR
    • G10K11/00—Methods or devices for transmitting, conducting or directing sound in general; Methods or devices for protecting against, or for damping, noise or other acoustic waves in general
    • G10K11/16—Methods or devices for protecting against, or for damping, noise or other acoustic waves in general
    • G10K11/175—Methods or devices for protecting against, or for damping, noise or other acoustic waves in general using interference effects; Masking sound
    • G10K11/178—Methods or devices for protecting against, or for damping, noise or other acoustic waves in general using interference effects; Masking sound by electro-acoustically regenerating the original acoustic waves in anti-phase
    • G10K11/1783—Methods or devices for protecting against, or for damping, noise or other acoustic waves in general using interference effects; Masking sound by electro-acoustically regenerating the original acoustic waves in anti-phase handling or detecting of non-standard events or conditions, e.g. changing operating modes under specific operating conditions
    • G10K11/17837—Methods or devices for protecting against, or for damping, noise or other acoustic waves in general using interference effects; Masking sound by electro-acoustically regenerating the original acoustic waves in anti-phase handling or detecting of non-standard events or conditions, e.g. changing operating modes under specific operating conditions by retaining part of the ambient acoustic environment, e.g. speech or alarm signals that the user needs to hear
    • G—PHYSICS
    • G10—MUSICAL INSTRUMENTS; ACOUSTICS
    • G10K—SOUND-PRODUCING DEVICES; METHODS OR DEVICES FOR PROTECTING AGAINST, OR FOR DAMPING, NOISE OR OTHER ACOUSTIC WAVES IN GENERAL; ACOUSTICS NOT OTHERWISE PROVIDED FOR
    • G10K11/00—Methods or devices for transmitting, conducting or directing sound in general; Methods or devices for protecting against, or for damping, noise or other acoustic waves in general
    • G10K11/16—Methods or devices for protecting against, or for damping, noise or other acoustic waves in general
    • G10K11/175—Methods or devices for protecting against, or for damping, noise or other acoustic waves in general using interference effects; Masking sound
    • G10K11/178—Methods or devices for protecting against, or for damping, noise or other acoustic waves in general using interference effects; Masking sound by electro-acoustically regenerating the original acoustic waves in anti-phase
    • G10K11/1785—Methods, e.g. algorithms; Devices
    • G10K11/17857—Geometric disposition, e.g. placement of microphones
    • G—PHYSICS
    • G10—MUSICAL INSTRUMENTS; ACOUSTICS
    • G10K—SOUND-PRODUCING DEVICES; METHODS OR DEVICES FOR PROTECTING AGAINST, OR FOR DAMPING, NOISE OR OTHER ACOUSTIC WAVES IN GENERAL; ACOUSTICS NOT OTHERWISE PROVIDED FOR
    • G10K11/00—Methods or devices for transmitting, conducting or directing sound in general; Methods or devices for protecting against, or for damping, noise or other acoustic waves in general
    • G10K11/16—Methods or devices for protecting against, or for damping, noise or other acoustic waves in general
    • G10K11/175—Methods or devices for protecting against, or for damping, noise or other acoustic waves in general using interference effects; Masking sound
    • G10K11/178—Methods or devices for protecting against, or for damping, noise or other acoustic waves in general using interference effects; Masking sound by electro-acoustically regenerating the original acoustic waves in anti-phase
    • G10K11/1787—General system configurations
    • G10K11/17879—General system configurations using both a reference signal and an error signal
    • G10K11/17881—General system configurations using both a reference signal and an error signal the reference signal being an acoustic signal, e.g. recorded with a microphone
    • G—PHYSICS
    • G10—MUSICAL INSTRUMENTS; ACOUSTICS
    • G10K—SOUND-PRODUCING DEVICES; METHODS OR DEVICES FOR PROTECTING AGAINST, OR FOR DAMPING, NOISE OR OTHER ACOUSTIC WAVES IN GENERAL; ACOUSTICS NOT OTHERWISE PROVIDED FOR
    • G10K11/00—Methods or devices for transmitting, conducting or directing sound in general; Methods or devices for protecting against, or for damping, noise or other acoustic waves in general
    • G10K11/16—Methods or devices for protecting against, or for damping, noise or other acoustic waves in general
    • G10K11/175—Methods or devices for protecting against, or for damping, noise or other acoustic waves in general using interference effects; Masking sound
    • G10K11/178—Methods or devices for protecting against, or for damping, noise or other acoustic waves in general using interference effects; Masking sound by electro-acoustically regenerating the original acoustic waves in anti-phase
    • G10K11/1787—General system configurations
    • G10K11/17885—General system configurations additionally using a desired external signal, e.g. pass-through audio such as music or speech
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04M—TELEPHONIC COMMUNICATION
    • H04M9/00—Arrangements for interconnection not involving centralised switching
    • H04M9/08—Two-way loud-speaking telephone systems with means for conditioning the signal, e.g. for suppressing echoes for one or both directions of traffic
    • H04M9/082—Two-way loud-speaking telephone systems with means for conditioning the signal, e.g. for suppressing echoes for one or both directions of traffic using echo cancellers
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04R—LOUDSPEAKERS, MICROPHONES, GRAMOPHONE PICK-UPS OR LIKE ACOUSTIC ELECTROMECHANICAL TRANSDUCERS; DEAF-AID SETS; PUBLIC ADDRESS SYSTEMS
    • H04R1/00—Details of transducers, loudspeakers or microphones
    • H04R1/10—Earpieces; Attachments therefor ; Earphones; Monophonic headphones
    • H04R1/1041—Mechanical or electronic switches, or control elements
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04R—LOUDSPEAKERS, MICROPHONES, GRAMOPHONE PICK-UPS OR LIKE ACOUSTIC ELECTROMECHANICAL TRANSDUCERS; DEAF-AID SETS; PUBLIC ADDRESS SYSTEMS
    • H04R1/00—Details of transducers, loudspeakers or microphones
    • H04R1/10—Earpieces; Attachments therefor ; Earphones; Monophonic headphones
    • H04R1/1083—Reduction of ambient noise
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04R—LOUDSPEAKERS, MICROPHONES, GRAMOPHONE PICK-UPS OR LIKE ACOUSTIC ELECTROMECHANICAL TRANSDUCERS; DEAF-AID SETS; PUBLIC ADDRESS SYSTEMS
    • H04R27/00—Public address systems
    • G—PHYSICS
    • G10—MUSICAL INSTRUMENTS; ACOUSTICS
    • G10K—SOUND-PRODUCING DEVICES; METHODS OR DEVICES FOR PROTECTING AGAINST, OR FOR DAMPING, NOISE OR OTHER ACOUSTIC WAVES IN GENERAL; ACOUSTICS NOT OTHERWISE PROVIDED FOR
    • G10K2210/00—Details of active noise control [ANC] covered by G10K11/178 but not provided for in any of its subgroups
    • G10K2210/10—Applications
    • G10K2210/108—Communication systems, e.g. where useful sound is kept and noise is cancelled
    • G10K2210/1081—Earphones, e.g. for telephones, ear protectors or headsets
    • G—PHYSICS
    • G10—MUSICAL INSTRUMENTS; ACOUSTICS
    • G10K—SOUND-PRODUCING DEVICES; METHODS OR DEVICES FOR PROTECTING AGAINST, OR FOR DAMPING, NOISE OR OTHER ACOUSTIC WAVES IN GENERAL; ACOUSTICS NOT OTHERWISE PROVIDED FOR
    • G10K2210/00—Details of active noise control [ANC] covered by G10K11/178 but not provided for in any of its subgroups
    • G10K2210/30—Means
    • G10K2210/301—Computational
    • G10K2210/3027—Feedforward
    • G—PHYSICS
    • G10—MUSICAL INSTRUMENTS; ACOUSTICS
    • G10L—SPEECH ANALYSIS OR SYNTHESIS; SPEECH RECOGNITION; SPEECH OR VOICE PROCESSING; SPEECH OR AUDIO CODING OR DECODING
    • G10L21/00—Processing of the speech or voice signal to produce another audible or non-audible signal, e.g. visual or tactile, in order to modify its quality or its intelligibility
    • G10L21/02—Speech enhancement, e.g. noise reduction or echo cancellation
    • G10L21/0208—Noise filtering
    • G—PHYSICS
    • G10—MUSICAL INSTRUMENTS; ACOUSTICS
    • G10L—SPEECH ANALYSIS OR SYNTHESIS; SPEECH RECOGNITION; SPEECH OR VOICE PROCESSING; SPEECH OR AUDIO CODING OR DECODING
    • G10L25/00—Speech or voice analysis techniques not restricted to a single one of groups G10L15/00 - G10L21/00
    • G10L25/03—Speech or voice analysis techniques not restricted to a single one of groups G10L15/00 - G10L21/00 characterised by the type of extracted parameters
    • G—PHYSICS
    • G10—MUSICAL INSTRUMENTS; ACOUSTICS
    • G10L—SPEECH ANALYSIS OR SYNTHESIS; SPEECH RECOGNITION; SPEECH OR VOICE PROCESSING; SPEECH OR AUDIO CODING OR DECODING
    • G10L25/00—Speech or voice analysis techniques not restricted to a single one of groups G10L15/00 - G10L21/00
    • G10L25/48—Speech or voice analysis techniques not restricted to a single one of groups G10L15/00 - G10L21/00 specially adapted for particular use
    • G10L25/51—Speech or voice analysis techniques not restricted to a single one of groups G10L15/00 - G10L21/00 specially adapted for particular use for comparison or discrimination
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04R—LOUDSPEAKERS, MICROPHONES, GRAMOPHONE PICK-UPS OR LIKE ACOUSTIC ELECTROMECHANICAL TRANSDUCERS; DEAF-AID SETS; PUBLIC ADDRESS SYSTEMS
    • H04R2460/00—Details of hearing devices, i.e. of ear- or headphones covered by H04R1/10 or H04R5/033 but not provided for in any of their subgroups, or of hearing aids covered by H04R25/00 but not provided for in any of its subgroups
    • H04R2460/01—Hearing devices using active noise cancellation
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04R—LOUDSPEAKERS, MICROPHONES, GRAMOPHONE PICK-UPS OR LIKE ACOUSTIC ELECTROMECHANICAL TRANSDUCERS; DEAF-AID SETS; PUBLIC ADDRESS SYSTEMS
    • H04R3/00—Circuits for transducers, loudspeakers or microphones

Definitions

  • the invention relates to a sound transmitting apparatus and method, more particularly to a transmitting apparatus and method capable of generating a warning depending on specific sound types.
  • Portable audio playing devices such as portable CD players and mp3 players, are extensively used by people nowadays. Users generally listen to music on the portable audio players with earphones or headsets.
  • 6,782, 106 B1 discloses a sound transmitting apparatus 14.
  • the sound transmitting apparatus 14 is electrically connected to a sound reproduction device (not shown), and earphones/headphones, and includes a microphone 20, a volume filter 22, and a mixer 28.
  • the microphone 20 can receive ambient sounds around the user and output the same to the volume filter 22.
  • the volume filter 22 is electrically connected to the sound reproduction device and the mixer 28, and receives the sound outputted by the sound reproduction device and the ambient sound outputted by the microphone 20 simultaneously. When the volume of the ambient sound outputted by the microphone 20 is greater than a specific value, the volume filter 22 will output the ambient sounds to the mixer 28.
  • the magnitude of the specific value can be set by the user.
  • the mixer 28 mixes the sound from the sound reproduction device and the sound from the volume filter 22, and outputs the mixed sound to the earphones.
  • the mixed sound is reproduced through the earphones to alert the user.
  • the conventional sound transmitting apparatus 14 supposes that the volume of a warning sound in an environment is greater than the specific value. However, there are often many sounds that have a volume greater than the specific value but do not signify any danger, e.g., sounds or music broadcast in a department store. The conventional sound transmitting apparatus 14 will regard these sounds as warning sounds and keep on alerting the user, which will result in considerable annoyance in use. In addition, there are many sounds in an environment which have a warning significance but are not very loud, e.g., bicycle bell ringing sounds, where the conventional volume filter 22 will filter off these warning sounds of small volume, thereby falling short of the purpose of warning the user. Therefore, one approach to solve the problems with the aforesaid prior art is to determine whether an ambient sound represents any danger according to its true significance, but not to determine by the volume of the ambient sound. Disclosure of Invention
  • an object of the present invention is to provide a transmitting apparatus capable of generating a warning depending on specific sound types.
  • the transmitting apparatus can recognize the ambient sounds having a dangerous significance, and timely send a warning to a user listening to sounds reproduced by a sound reproduction device through earphones.
  • Another object of the present invention is to provide a transmitting method capable of generating a warning depending on specific sound types.
  • the method can be used to accurately determine the type of an ambient sound and, when the ambient sound is indeed a sound of danger, to generate a warning to notify the user.
  • the transmitting apparatus capable of generating a warning depending on specific sound types of the present invention is adapted to alert a user listening to sounds using earphones, the sound from the earphones being reproduced by a sound reproduction device.
  • the transmitting apparatus capable of generating a warning depending on specific sound types includes a sound receiver, a database, a sound recognizer, an emergency alerting device, and a mixer.
  • the sound receiver can receive an ambient sound around the user and output the same to the sound recognizer and the emergency alerting device.
  • the database stores a plurality of features of sounds to be noticed.
  • the sound recognizer can receive the ambient sound outputted by the sound receiver, extract a feature of the ambient sound, and compare the feature of the ambient sound with the features of various types of sounds in the database so as to determine whether the ambient sound is one of the sound types in the database.
  • the emergency alerting device includes a noise processing unit, an alarming unit and a selection unit.
  • the selection unit is electrically connected to the sound recognizer, the alarming unit and the noise processing unit, and receives a determination result from the sound recognizer.
  • the selection unit instructs the noise processing unit to send the received ambient sound outputted by the sound receiver and its corresponding inverse phase waveform to the mixer.
  • the selection unit can select either the noise processing unit or the alarming unit to output an alarm sound. If the selection unit selects the noise processing unit, the noise processing unit uses the ambient sound after volume adjustment as the alarm sound and outputs the same to the mixer. If the selection unit selects the alarming unit, the alarming unit selects a corresponding and pre-recorded alarm sound according to the determination result of the sound recognizer, and outputs the alarm sound to the mixer.
  • the mixer can receive the sound from the sound reproduction device and the alarm sound outputted by the emergency alerting device, and can pause outputting the sounds reproduced by the sound reproduction device to output the alarm sound instead, or mix the alarm sound and the sounds reproduced by the sound reproduction device for subsequent output.
  • the transmitting method capable of generating a warning depending on specific sound types of the present invention includes the following steps:
  • Figure 1 is the block diagram of a transmitting apparatus capable of generating a warning depending on specific sound types according to the invention
  • Figure 2 is a waveform diagram to illustrate an ambient sound, its corresponding inverse phase waveform, and a combined waveform
  • Figure 3 is a flowchart of a transmitting method capable of generating a warning depending on specific sound types
  • Figure 4 is the block diagram of a conventional sound transmitting apparatus.
  • the preferred embodiment of a transmitting apparatus 3 capable of generating a warning depending on specific sound types according to the present invention is adapted to alert a user who uses earphones 9 to receive sounds reproduced by a sound reproduction device 7 to take notice of the ambient sound.
  • the transmitting apparatus 3 includes a sound receiver 31 , a sound recognizer 32, a database 33, an emergency alerting device 34, a preference setting device 35, a mixer 36, and an error detector 37.
  • the sound receiver 31 can receive the ambient sound around the user and output the same to the sound recognizer 32.
  • the sound receiver 31 can be a microphone, but is not limited thereto.
  • the database 33 stores a plurality of features of sounds signifying emergency or danger, e.g., features of siren sound, car braking sound, car horn sound, etc.
  • the feature of each sound refers to a feature vector analyzed using Mel-scale Frequency Cepstral Coefficients (MFCC), but is not limited thereto.
  • MFCC Mel-scale Frequency Cepstral Coefficients
  • ZCR zero crossing rate
  • sound energy of the ambient sound can also be used as the feature of the ambient sound.
  • MFCC scheme reference can be made to "Fundamentals of Speech Recognition" by L. Rabiner and B. -H. Juang, Prentice Hall, 1993.
  • the sound signal is transformed from a time domain signal to a frequency domain signal using Fourier Transform, the frequency domain signal representing the energy of the sound at each frequency.
  • Energy values of corresponding frequency ranges are obtained from the multiplication of a plurality of triangular band-pass filters covering the different frequency ranges, each of which represents a different weight, by the energy value of each corresponding frequency, where one of the triangular band-pass filters covers a corresponding sound frequency range that is perceivable by human auditory organs.
  • a plurality of feature values equivalent to the triangular band-pass filters in number can be obtained.
  • the feature values can be used as a feature vector that can represent the sound.
  • the sound recognizer 32 is electrically connected to the database 33 and the emergency alerting device 34, and receives the ambient sound outputted by the sound receiver 31.
  • the sound recognizer 32 can extract a feature vector of the ambient sound, compare the feature vector with the feature vectors of various types of sounds in the database 33 so as to determine whether the ambient sound is one of the sound types in the database 33, and, after determination, output the determination result to the emergency alerting device 34.
  • the comparison scheme adopted by the sound recognizer 32 to compare the feature vector of the ambient sound with the feature vectors stored in the database 33 may be the Mahalanobis Distance scheme.
  • the scheme is described in "Pattern Recognition” written by S. -T. Bow and published by Jwang Yuan in 1984.
  • the Euclidian distance between the feature of the ambient sound and the feature vectors of various types of sounds stored in the database 33 is calculated.
  • the Mahalanobis Distance scheme also calculates the variance in the feature vectors. When the Euclidian distance is sufficiently small, this indicates that the ambient sound signal matches one of the sound types in the database 33.
  • the sound recognizer 32 may also adopt other schemes to compare the ambient sound with the feature vectors stored in the database 33, such as the Hidden Markov models described in "Fundamentals of Speech Recognition” written by L. Rabiner and B. -H. Juang and published by Prentice Hall in 1993, but is not limited thereto.
  • the emergency alerting device 34 includes a selection unit 341 , an alarming unit 342, and a noise processing unit 343.
  • the selection unit 341 is electrically connected to the sound recognizer 32, the alarming unit 342, the noise processing unit 343, and the preference setting device 35, and receives the result determined by the sound recognizer 32. Moreover, after the sound recognizer 32 has determined that the ambient sound is not a sound of a dangerous type, the selection unit 341 will instruct the noise processing unit 343 to process the received ambient sound outputted by the sound receiver.
  • the selection unit 341 can send the result determined by the sound recognizer 32 to either the alarming unit 342 so as to command the alarming unit 342 to operate or the noise processing unit 343 so as to command the noise processing unit 343 to operate.
  • the alarming unit 342 is electrically connected to the selection unit 341 and the mixer 36, and is capable of outputting an alarm sound.
  • the alarm sound can be set according to the user's preference. For instance, when the ambient sound is a car braking sound, a pre-stored speech sound, "look out for cars" can be used as the alarm sound. Alternatively, when the ambient sound is a siren sound, a pre-stored continuous, quick beeping sound can be used as the alarm sound.
  • the alarming unit 342 Upon receiving from the selection unit 341 the command to request operation, the alarming unit 342 will output an alarm sound corresponding to the ambient sound to the mixer 36.
  • the noise processing unit 343 is electrically connected to the selection unit 341 and the mixer 36, and is capable of receiving the command outputted by the selection unit 341. Besides, when the ambient sound is not one of the sound types in the database 33, the ambient sound and its inverse phase waveform are outputted to the mixer 36. The method of generating the inverse phase waveform will be described in detail in the succeeding paragraphs. When the ambient sound is one of the sound types in the database 33, and when the command of the selection unit 341 is received, the ambient sound whose volume having been adjusted is used as the alarm sound, and the alarm sound is outputted to the mixer 36.
  • the mixer 36 is electrically connected to the sound reproduction device 7 and the earphones 9, and can pause reception of the sound reproduced by the sound reproduction device 7 upon receiving the alarm sound sent from the alarming unit 342 or the noise processing unit 343 and output the alarm sound to the earphones 9 instead so as to alert the user to a dangerous situation therearound.
  • the mixer 36 can also mix the sound outputted by the sound reproduction device 7 and the alarm sound before outputting to the earphones 9, depending on the user's preference setting.
  • the preference setting device 35 is electrically connected to the selection unit 341 and the mixer 36, and can, depending on the user's setting, control the mixer 36 to adopt the scheme of mixing the alarm sound and the sound outputted by the sound reproduction device 7 before making an output, or the scheme of pausing reception of the sound reproduced by the sound reproduction device 7 and outputting the alarm sound to the earphones 9 instead.
  • the preference setting device 35 can, depending on the user's setting, control the selection unit 341 to select either the alarming unit 342 or the noise processing unit 343 to output the alarm sound when the ambient sound is a sound of danger.
  • the noise processing unit 343 employs, but is not limited to, automatic noise cancel (ANC) technology to eliminate ambient sounds that do not belong to the sound types in the database 33.
  • ANC automatic noise cancel
  • the ANC technology is employed to generate an inverse phase waveform of the ambient sound such that a combined waveform after summation of the ambient sound and the inverse phase waveform thereof approximates zero.
  • the error detector 37 is a microphone disposed at a periphery of the earphones 9. During the warm-up process of the sound reproduction device 7 upon powering on, or when one piece of music to be reproduced is changed to another by the sound reproduction device 7, the sound reproduction device 7 does not output any sounds. At this point, the error detector 37 can receive from the earphones 9 the combined waveform of the ambient sound and its inverse phase waveform, and send the combined waveform to the noise processing unit 343.
  • the noise processing unit 343 can correct the inverse phase waveform of the ambient sound using a combined waveform not equal to zero so as to achieve the object of completely eliminating the ambient sound.
  • the transmitting method capable of generating a warning depending on specific sound types includes the following steps:
  • step 401 the sound receiver 31 receives an ambient sound and outputs the same to the noise processing unit 343 for generation of its corresponding inverse phase waveform.
  • step 402 the sound recognizer 32 extracts the feature of the ambient sound.
  • step 403 the sound recognizer 32 compares the feature of the ambient sound with features of the sound types in the database 33 so as to determine the classification of the ambient sound. If the ambient sound is not one of the sound types in the database 33, the flow skips to step 410, indicating that the sound does not have any emergency significance. If the ambient sound is one of the sound types in the database 33, the flow goes to step 404.
  • step 404 a determination is made according to a setting value of the preference setting device 35 as to whether the selection unit 341 selects the alarming unit 342 so as to use a pre-recorded sound as the alarm sound. If yes, the flow goes to step 405. Otherwise, the flow skips to step 406 to select the noise processing unit 343.
  • step 405 the alarming unit 342 delivers a pre-recorded sound for output to the mixer 36 to serve as the alarm sound. Then, step 407 is executed.
  • step 406 the noise processing unit 343 stops generating the inverse phase waveform of the ambient sound, and outputs the ambient sound to the mixer 36 to serve as the alarm sound. Then, step 407 is executed.
  • step 407 a determination is made according to a setting value of the preference setting device 35 as to whether reception of the sound reproduced by the sound reproduction device 7 is to be paused. If yes, the flow skips to step 409. Otherwise, the flow goes to step 408.
  • step 408 the mixer 36 mixes the alarm sound and the sound reproduced by the sound reproduction device 7 for output. The flow then returns to step 401.
  • step 409 the mixer 36 pauses reception of the sound reproduced by the sound reproduction device 7, and outputs the alarm sound independently. The flow then returns to step 401.
  • step 410 the mixer 36 receives the inverse phase waveform of the ambient sound, and mixes the inverse phase waveform of the ambient sound and the sound reproduced by the sound reproduction device 7 for output. The flow then returns to step 401.
  • the present invention utilizes the sound recognizer 32 to determine whether the ambient sound matches a sound type in the database 33.
  • the inverse phase waveform of the ambient sound is used to counterbalance the ambient sound so that the user merely hears the sounds generated by the sound reproduction device 7.
  • a sound preferred by the user or the ambient sound is used as an alarm sound, and reception of the sounds reproduced by the sound reproduction device 7 is paused to allow the playing of the alarm sound instead.
  • the alarm sound and the sound reproduced by the sound reproduction device 7 are mixed for playing so as to alert the user to take notice thereof. Therefore, the present invention can be employed to positively recognize sounds that the user should take notice of in an environment, thereby achieving the objects of the present invention.
  • the present invention can be applied to transmitting apparatus and method capable of generating a warning depending on sound types.

Abstract

A transmitting apparatus capable of generating a warning depending on specific sound types includes a sound receiver for receiving an ambient sound, a database storing features of a plurality of sounds, a sound recognizer, an emergency alerting device, and a mixer. The sound recognizer can extract a feature of the ambient sound, and compare the feature of the ambient sound with the features of the sounds in the database so as to determine whether the ambient sound is one of the sound types. When the sound recognizer determines the ambient sound to be one of the sound types in the database, the emergency alerting device outputs an alarm sound. The mixer can output the alarm sound instead of sounds reproduced by a sound reproduction device, or mix the alarm sound and the sounds reproduced by the sound reproduction device for subsequent output.

Description

DESCRIPTION
TRANSMITTING APPARATUS AND METHOD
CAPABLE OF GENERATING A WARNING DEPENDING ON SOUND TYPES
Technical Field
The invention relates to a sound transmitting apparatus and method, more particularly to a transmitting apparatus and method capable of generating a warning depending on specific sound types.
Background Art
Portable audio playing devices, such as portable CD players and mp3 players, are extensively used by people nowadays. Users generally listen to music on the portable audio players with earphones or headsets.
Users wearing earphones often listen to the music through the earphones while walking in the street. However, as these users usually concentrate only on listening to the music without much notice of external warning sounds (e.g., car horn sound), or they cannot hear the external warning sounds due to the large volume of the sounds from the earphones, dangerous accidents may occur if the users cannot timely react in response to the external warning sounds.
Referring to Figure 4, in order to solve the aforesaid problem, USP
6,782, 106 B1 discloses a sound transmitting apparatus 14. The sound transmitting apparatus 14 is electrically connected to a sound reproduction device (not shown), and earphones/headphones, and includes a microphone 20, a volume filter 22, and a mixer 28.
The microphone 20 can receive ambient sounds around the user and output the same to the volume filter 22.
The volume filter 22 is electrically connected to the sound reproduction device and the mixer 28, and receives the sound outputted by the sound reproduction device and the ambient sound outputted by the microphone 20 simultaneously. When the volume of the ambient sound outputted by the microphone 20 is greater than a specific value, the volume filter 22 will output the ambient sounds to the mixer 28. The magnitude of the specific value can be set by the user.
The mixer 28 mixes the sound from the sound reproduction device and the sound from the volume filter 22, and outputs the mixed sound to the earphones. The mixed sound is reproduced through the earphones to alert the user.
The conventional sound transmitting apparatus 14 supposes that the volume of a warning sound in an environment is greater than the specific value. However, there are often many sounds that have a volume greater than the specific value but do not signify any danger, e.g., sounds or music broadcast in a department store. The conventional sound transmitting apparatus 14 will regard these sounds as warning sounds and keep on alerting the user, which will result in considerable annoyance in use. In addition, there are many sounds in an environment which have a warning significance but are not very loud, e.g., bicycle bell ringing sounds, where the conventional volume filter 22 will filter off these warning sounds of small volume, thereby falling short of the purpose of warning the user. Therefore, one approach to solve the problems with the aforesaid prior art is to determine whether an ambient sound represents any danger according to its true significance, but not to determine by the volume of the ambient sound. Disclosure of Invention
Therefore, an object of the present invention is to provide a transmitting apparatus capable of generating a warning depending on specific sound types. The transmitting apparatus can recognize the ambient sounds having a dangerous significance, and timely send a warning to a user listening to sounds reproduced by a sound reproduction device through earphones.
Another object of the present invention is to provide a transmitting method capable of generating a warning depending on specific sound types. The method can be used to accurately determine the type of an ambient sound and, when the ambient sound is indeed a sound of danger, to generate a warning to notify the user.
Accordingly, the transmitting apparatus capable of generating a warning depending on specific sound types of the present invention is adapted to alert a user listening to sounds using earphones, the sound from the earphones being reproduced by a sound reproduction device.
The transmitting apparatus capable of generating a warning depending on specific sound types includes a sound receiver, a database, a sound recognizer, an emergency alerting device, and a mixer. The sound receiver can receive an ambient sound around the user and output the same to the sound recognizer and the emergency alerting device. The database stores a plurality of features of sounds to be noticed. The sound recognizer can receive the ambient sound outputted by the sound receiver, extract a feature of the ambient sound, and compare the feature of the ambient sound with the features of various types of sounds in the database so as to determine whether the ambient sound is one of the sound types in the database.
The emergency alerting device includes a noise processing unit, an alarming unit and a selection unit. The selection unit is electrically connected to the sound recognizer, the alarming unit and the noise processing unit, and receives a determination result from the sound recognizer. When the sound recognizer determines that the ambient sound is not one of the sound types in the database, the selection unit instructs the noise processing unit to send the received ambient sound outputted by the sound receiver and its corresponding inverse phase waveform to the mixer.
When the sound recognizer determines that the ambient sound is one of the sound types in the database, the selection unit can select either the noise processing unit or the alarming unit to output an alarm sound. If the selection unit selects the noise processing unit, the noise processing unit uses the ambient sound after volume adjustment as the alarm sound and outputs the same to the mixer. If the selection unit selects the alarming unit, the alarming unit selects a corresponding and pre-recorded alarm sound according to the determination result of the sound recognizer, and outputs the alarm sound to the mixer.
The mixer can receive the sound from the sound reproduction device and the alarm sound outputted by the emergency alerting device, and can pause outputting the sounds reproduced by the sound reproduction device to output the alarm sound instead, or mix the alarm sound and the sounds reproduced by the sound reproduction device for subsequent output.
The transmitting method capable of generating a warning depending on specific sound types of the present invention includes the following steps:
(A) receiving an ambient sound;
(B) acquiring a feature of the ambient sound; (C) comparing the feature of the ambient sound with features of a plurality of sounds to be noticed so as to determine whether the ambient sound is one of the sound types to be noticed; and
(D)when the ambient sound is one of the sound types to be noticed, stopping outputting the sound from the sound reproduction device to the earphones or a headset but to output an alarm sound instead, or mixing the alarm sound and the sound from the sound reproduction device for subsequent output.
Brief Description of Drawings
Other features and advantages of the present invention will become apparent in the following detailed description of the preferred embodiment with reference to the accompanying drawings, of which:
Figure 1 is the block diagram of a transmitting apparatus capable of generating a warning depending on specific sound types according to the invention;
Figure 2 is a waveform diagram to illustrate an ambient sound, its corresponding inverse phase waveform, and a combined waveform;
Figure 3 is a flowchart of a transmitting method capable of generating a warning depending on specific sound types; and
Figure 4 is the block diagram of a conventional sound transmitting apparatus.
Best Mode for Carrying Out the Invention Referring to Figure 1 , the preferred embodiment of a transmitting apparatus 3 capable of generating a warning depending on specific sound types according to the present invention is adapted to alert a user who uses earphones 9 to receive sounds reproduced by a sound reproduction device 7 to take notice of the ambient sound. The transmitting apparatus 3 includes a sound receiver 31 , a sound recognizer 32, a database 33, an emergency alerting device 34, a preference setting device 35, a mixer 36, and an error detector 37. The sound receiver 31 can receive the ambient sound around the user and output the same to the sound recognizer 32. The sound receiver 31 can be a microphone, but is not limited thereto.
The database 33 stores a plurality of features of sounds signifying emergency or danger, e.g., features of siren sound, car braking sound, car horn sound, etc. In this embodiment, the feature of each sound refers to a feature vector analyzed using Mel-scale Frequency Cepstral Coefficients (MFCC), but is not limited thereto. The zero crossing rate (ZCR) or sound energy of the ambient sound can also be used as the feature of the ambient sound. For the MFCC scheme, reference can be made to "Fundamentals of Speech Recognition" by L. Rabiner and B. -H. Juang, Prentice Hall, 1993. According to the MFCC scheme, the sound signal is transformed from a time domain signal to a frequency domain signal using Fourier Transform, the frequency domain signal representing the energy of the sound at each frequency. Energy values of corresponding frequency ranges are obtained from the multiplication of a plurality of triangular band-pass filters covering the different frequency ranges, each of which represents a different weight, by the energy value of each corresponding frequency, where one of the triangular band-pass filters covers a corresponding sound frequency range that is perceivable by human auditory organs. Thus, a plurality of feature values equivalent to the triangular band-pass filters in number can be obtained. The feature values can be used as a feature vector that can represent the sound. The sound recognizer 32 is electrically connected to the database 33 and the emergency alerting device 34, and receives the ambient sound outputted by the sound receiver 31. The sound recognizer 32 can extract a feature vector of the ambient sound, compare the feature vector with the feature vectors of various types of sounds in the database 33 so as to determine whether the ambient sound is one of the sound types in the database 33, and, after determination, output the determination result to the emergency alerting device 34.
In this embodiment, the comparison scheme adopted by the sound recognizer 32 to compare the feature vector of the ambient sound with the feature vectors stored in the database 33 may be the Mahalanobis Distance scheme. The scheme is described in "Pattern Recognition" written by S. -T. Bow and published by Jwang Yuan in 1984. According to the scheme, the Euclidian distance between the feature of the ambient sound and the feature vectors of various types of sounds stored in the database 33 is calculated. During the calculation process, the Mahalanobis Distance scheme also calculates the variance in the feature vectors. When the Euclidian distance is sufficiently small, this indicates that the ambient sound signal matches one of the sound types in the database 33.
The sound recognizer 32 may also adopt other schemes to compare the ambient sound with the feature vectors stored in the database 33, such as the Hidden Markov models described in "Fundamentals of Speech Recognition" written by L. Rabiner and B. -H. Juang and published by Prentice Hall in 1993, but is not limited thereto.
The emergency alerting device 34 includes a selection unit 341 , an alarming unit 342, and a noise processing unit 343. The selection unit 341 is electrically connected to the sound recognizer 32, the alarming unit 342, the noise processing unit 343, and the preference setting device 35, and receives the result determined by the sound recognizer 32. Moreover, after the sound recognizer 32 has determined that the ambient sound is not a sound of a dangerous type, the selection unit 341 will instruct the noise processing unit 343 to process the received ambient sound outputted by the sound receiver.
When the sound recognizer 32 determines that the ambient sound is of a dangerous type, the selection unit 341 can send the result determined by the sound recognizer 32 to either the alarming unit 342 so as to command the alarming unit 342 to operate or the noise processing unit 343 so as to command the noise processing unit 343 to operate.
The alarming unit 342 is electrically connected to the selection unit 341 and the mixer 36, and is capable of outputting an alarm sound. The alarm sound can be set according to the user's preference. For instance, when the ambient sound is a car braking sound, a pre-stored speech sound, "look out for cars" can be used as the alarm sound. Alternatively, when the ambient sound is a siren sound, a pre-stored continuous, quick beeping sound can be used as the alarm sound. Upon receiving from the selection unit 341 the command to request operation, the alarming unit 342 will output an alarm sound corresponding to the ambient sound to the mixer 36.
The noise processing unit 343 is electrically connected to the selection unit 341 and the mixer 36, and is capable of receiving the command outputted by the selection unit 341. Besides, when the ambient sound is not one of the sound types in the database 33, the ambient sound and its inverse phase waveform are outputted to the mixer 36. The method of generating the inverse phase waveform will be described in detail in the succeeding paragraphs. When the ambient sound is one of the sound types in the database 33, and when the command of the selection unit 341 is received, the ambient sound whose volume having been adjusted is used as the alarm sound, and the alarm sound is outputted to the mixer 36. The mixer 36 is electrically connected to the sound reproduction device 7 and the earphones 9, and can pause reception of the sound reproduced by the sound reproduction device 7 upon receiving the alarm sound sent from the alarming unit 342 or the noise processing unit 343 and output the alarm sound to the earphones 9 instead so as to alert the user to a dangerous situation therearound. In addition, the mixer 36 can also mix the sound outputted by the sound reproduction device 7 and the alarm sound before outputting to the earphones 9, depending on the user's preference setting.
The preference setting device 35 is electrically connected to the selection unit 341 and the mixer 36, and can, depending on the user's setting, control the mixer 36 to adopt the scheme of mixing the alarm sound and the sound outputted by the sound reproduction device 7 before making an output, or the scheme of pausing reception of the sound reproduced by the sound reproduction device 7 and outputting the alarm sound to the earphones 9 instead. In addition, the preference setting device 35 can, depending on the user's setting, control the selection unit 341 to select either the alarming unit 342 or the noise processing unit 343 to output the alarm sound when the ambient sound is a sound of danger. When the ambient sound is not one of the sound types in the database 33, in order to enable the user to listen to the sounds outputted by the sound reproduction device 7 normally, interference caused by the ambient sound to the sounds outputted by the sound reproduction device 7 has to be eliminated. In the preferred embodiment of this invention, the noise processing unit 343 employs, but is not limited to, automatic noise cancel (ANC) technology to eliminate ambient sounds that do not belong to the sound types in the database 33. Referring to Figure 2, the ANC technology is employed to generate an inverse phase waveform of the ambient sound such that a combined waveform after summation of the ambient sound and the inverse phase waveform thereof approximates zero.
Referring back to Figure 1 , the error detector 37 is a microphone disposed at a periphery of the earphones 9. During the warm-up process of the sound reproduction device 7 upon powering on, or when one piece of music to be reproduced is changed to another by the sound reproduction device 7, the sound reproduction device 7 does not output any sounds. At this point, the error detector 37 can receive from the earphones 9 the combined waveform of the ambient sound and its inverse phase waveform, and send the combined waveform to the noise processing unit 343.
When the inverse phase waveform and the ambient sound cannot be completely counterbalanced, the noise processing unit 343 can correct the inverse phase waveform of the ambient sound using a combined waveform not equal to zero so as to achieve the object of completely eliminating the ambient sound.
Referring to Figure 3, the transmitting method capable of generating a warning depending on specific sound types according to the present invention includes the following steps:
In step 401 , the sound receiver 31 receives an ambient sound and outputs the same to the noise processing unit 343 for generation of its corresponding inverse phase waveform. In step 402, the sound recognizer 32 extracts the feature of the ambient sound.
In step 403, the sound recognizer 32 compares the feature of the ambient sound with features of the sound types in the database 33 so as to determine the classification of the ambient sound. If the ambient sound is not one of the sound types in the database 33, the flow skips to step 410, indicating that the sound does not have any emergency significance. If the ambient sound is one of the sound types in the database 33, the flow goes to step 404. In step 404, a determination is made according to a setting value of the preference setting device 35 as to whether the selection unit 341 selects the alarming unit 342 so as to use a pre-recorded sound as the alarm sound. If yes, the flow goes to step 405. Otherwise, the flow skips to step 406 to select the noise processing unit 343. In step 405, the alarming unit 342 delivers a pre-recorded sound for output to the mixer 36 to serve as the alarm sound. Then, step 407 is executed.
In step 406, the noise processing unit 343 stops generating the inverse phase waveform of the ambient sound, and outputs the ambient sound to the mixer 36 to serve as the alarm sound. Then, step 407 is executed.
In step 407, a determination is made according to a setting value of the preference setting device 35 as to whether reception of the sound reproduced by the sound reproduction device 7 is to be paused. If yes, the flow skips to step 409. Otherwise, the flow goes to step 408.
In step 408, the mixer 36 mixes the alarm sound and the sound reproduced by the sound reproduction device 7 for output. The flow then returns to step 401. In step 409, the mixer 36 pauses reception of the sound reproduced by the sound reproduction device 7, and outputs the alarm sound independently. The flow then returns to step 401.
In step 410, the mixer 36 receives the inverse phase waveform of the ambient sound, and mixes the inverse phase waveform of the ambient sound and the sound reproduced by the sound reproduction device 7 for output. The flow then returns to step 401.
In sum, the present invention utilizes the sound recognizer 32 to determine whether the ambient sound matches a sound type in the database 33. When the ambient sound is not one of the sound types in the database 33, the inverse phase waveform of the ambient sound is used to counterbalance the ambient sound so that the user merely hears the sounds generated by the sound reproduction device 7. Besides, when the ambient sound is one of the sound types in the database 33, a sound preferred by the user or the ambient sound is used as an alarm sound, and reception of the sounds reproduced by the sound reproduction device 7 is paused to allow the playing of the alarm sound instead. Alternatively, the alarm sound and the sound reproduced by the sound reproduction device 7 are mixed for playing so as to alert the user to take notice thereof. Therefore, the present invention can be employed to positively recognize sounds that the user should take notice of in an environment, thereby achieving the objects of the present invention.
While the present invention has been described in connection with what is considered the most practical and preferred embodiment, it is understood that this invention is not limited to the disclosed embodiment but is intended to cover various arrangements included within the spirit and scope of the broadest interpretation so as to encompass all such modifications and equivalent arrangements. Industrial Applicability
The present invention can be applied to transmitting apparatus and method capable of generating a warning depending on sound types.

Claims

1. A transmitting apparatus capable of generating a warning depending on specific sound types, which is adapted to alert a user receiving sounds reproduced by a sound reproduction device through earphones or a headset to be careful of ambient sounds to be noticed, said transmitting apparatus comprising: a sound receiver for receiving an ambient sound around the user; a database for storing a plurality of features of sounds to be noticed; a sound recognizer for receiving the ambient sound from said sound receiver, extracting a feature of the ambient sound, comparing the feature of the ambient sound with the features of various types of sounds in said database to determine whether the ambient sound is one of the sound types in said database, and outputting a determination result; an emergency alerting device for outputting an alarm sound when said sound recognizer determines the ambient sound is one of the sound types in said database; and a mixer capable of receiving the sound from the sound reproduction device and the alarm sound from said emergency alerting device, and, when said sound recognizer determines the ambient sound to be one of the sound types in said database, stopping the sound output from the sound reproduction device to output the alarm sound instead, or mixing the alarm sound and the sound reproduced by the sound reproduction device for subsequent output.
2. The transmitting apparatus according to Claim 1 , further comprising a preference setting device, said preference setting device permitting the setting of said mixer to enable said mixer to pause the sound output from the sound reproduction device to output the alarm sound instead, or to mix the alarm sound and the sound from the sound reproduction device for subsequent output.
3. The transmitting apparatus according to Claim 1 , wherein said emergency alerting device includes an alarming unit, said alarming unit being capable of receiving the determination result outputted by the sound recognizer, selecting a corresponding pre-recorded alarm sound according to the determination result, and outputting the selected alarm sound to said mixer.
4. The transmitting apparatus according to Claim 1 , wherein said emergency alerting device includes a noise processing unit such that when the ambient sound is not one of the sound types in said database, said noise processing unit receives the ambient sound outputted by said sound receiver and sends the ambient sound and its corresponding inverse phase waveform to said mixer, such that when the ambient sound is one of the sound types in said database, said noise processing unit can use the ambient sound after volume adjustment as the alarm sound.
5. The transmitting apparatus according to Claim 4, further comprising an error detector, said error detector receiving a combined waveform of the ambient sound and its corresponding inverse phase waveform when the sound reproduction device does not output any sounds, and outputting the combined waveform to said noise processing unit for correction by said noise processing unit.
6. The transmitting apparatus according to Claim 1 , wherein said emergency alerting device includes a noise processing unit, an alarming unit, and a selection unit, said selection unit being electrically connected to said sound recognizer, said alarming unit and said noise processing unit, and receiving the determination result from said sound recognizer such that when said sound recognizer determines that the ambient sound is not one of the sound types in said database, said selection unit instructs said noise processing unit to send the received ambient sound and its corresponding inverse phase waveform to said mixer, and otherwise, said selection unit selects either said noise processing unit or said alarming unit to output the alarm sound, said noise processing unit using the ambient sound after volume adjustment as the alarm sound for outputting to said mixer when selected by said selection unit, said alarming unit selecting a corresponding pre-recorded alarm sound according to the determination result of said sound recognizer and outputting the alarm sound to said mixer when selected by said selection unit.
7. The transmitting apparatus according to Claim 6, further comprising a preference setting device, said preference setting device permitting the setting of said mixer to enable said mixer to pause the sound output from the sound reproduction device to output the alarm sound instead, or to mix the alarm sound and the sound from the sound reproduction device for subsequent output, said preference setting device further permitting the setting of said selection unit to select said alarming unit or said noise processing unit to output the alarm sound.
8. The transmitting apparatus according to Claim 6, further comprising an error detector, said error detector receiving a combined waveform of the ambient sound and its corresponding inverse phase waveform when the sound reproduction device does not output any sounds, and outputting the combined waveform to said noise processing unit for correction by said noise processing unit.
9. The transmitting apparatus according to Claim 1 , wherein said t sound recognizer uses a feature vector of the ambient sound analyzed using Mel-scale Frequency Cepstral Coefficients to represent the feature of the ambient sound.
10. The transmitting apparatus according to Claim 1 , wherein said sound recognizer calculates a zero crossing rate or sound energy of the ambient sound to serve as the feature of the ambient sound.
11. The transmitting apparatus according to Claim 9 or 10, wherein said sound recognizer adopts a Mahalanobis Distance scheme to compare the feature of the ambient sound with the features of the sound types in said database.
12. A transmitting method capable of generating a warning depending on specific sound types, which is adapted to alert a user receiving sounds reproduced by a sound reproduction device through earphones or a headset to be careful of ambient soundsto be noticed, comprising the following steps:
(A) receiving an ambient sound;
(B) acquiring a feature of the ambient sound;
(C) comparing the feature of the ambient sound with features of a plurality of sounds to be noticed so as to determine whether the ambient sound is one of the sound types to be noticed; and
(D)when the ambient sound is one of the sound types to be noticed, stopping outputting the sound from the sound reproduction device to the earphones or the headset but to output an alarm sound instead, or mixing the alarm sound and the sound from the sound reproduction device for subsequent output.
13. The transmitting method according to Claim 12, wherein, in step (B), a feature vector of the ambient sound analyzed using Mel-scale Frequency Cepstral Coefficients is used to represent the feature of the ambient sound.
14. The transmitting method according to Claim 12, wherein, in step (B), a zero crossing rate or sound energy of the ambient sound is used to serve as the feature of the ambient sound.
15. The transmitting method according to Claim 13 or 14, wherein, in step (C), a Mahalanobis Distance scheme is used to compare the feature of the ambient sound with the features of the sounds to be noticed.
16. The transmitting method according to Claim 12, wherein, in step (D), a pre-recorded sound is used as the alarm sound.
17. The transmitting method according to Claim 12, wherein, in step (D), when the ambient sound is one of the sound types to be noticed, the ambient sound is directly outputted as the alarm sound.
18. The transmitting method according to Claim 12, wherein, in step (D), when the ambient sound is not one of the sound types to be noticed, the ambient sound and its corresponding inverse phase waveform are outputted to the earphones or the headset.
PCT/JP2006/314321 2005-07-14 2006-07-13 Transmitting apparatus and method capable of generating a warning depending on sound types WO2007007916A1 (en)

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