WO2007014136A3 - Robust separation of speech signals in a noisy environment - Google Patents

Robust separation of speech signals in a noisy environment Download PDF

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Publication number
WO2007014136A3
WO2007014136A3 PCT/US2006/028627 US2006028627W WO2007014136A3 WO 2007014136 A3 WO2007014136 A3 WO 2007014136A3 US 2006028627 W US2006028627 W US 2006028627W WO 2007014136 A3 WO2007014136 A3 WO 2007014136A3
Authority
WO
WIPO (PCT)
Prior art keywords
signal
speech
voice activity
stage
output stage
Prior art date
Application number
PCT/US2006/028627
Other languages
French (fr)
Other versions
WO2007014136A2 (en
WO2007014136A9 (en
Inventor
Erik Visser
Jeremy Toman
Kwokleung Chan
Original Assignee
Softmax Inc
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 Softmax Inc filed Critical Softmax Inc
Priority to EP06788278A priority Critical patent/EP1908059A4/en
Priority to JP2008523036A priority patent/JP2009503568A/en
Publication of WO2007014136A2 publication Critical patent/WO2007014136A2/en
Publication of WO2007014136A3 publication Critical patent/WO2007014136A3/en
Publication of WO2007014136A9 publication Critical patent/WO2007014136A9/en

Links

Classifications

    • G—PHYSICS
    • G10—MUSICAL INSTRUMENTS; ACOUSTICS
    • G10L—SPEECH ANALYSIS OR SYNTHESIS; SPEECH RECOGNITION; SPEECH OR VOICE PROCESSING; SPEECH OR AUDIO CODING OR DECODING
    • G10L15/00—Speech recognition
    • G10L15/20—Speech recognition techniques specially adapted for robustness in adverse environments, e.g. in noise, of stress induced speech
    • 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
    • G10L25/78—Detection of presence or absence of voice signals
    • 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
    • G10L21/0272—Voice signal separating
    • 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
    • G10L25/78—Detection of presence or absence of voice signals
    • G10L25/84—Detection of presence or absence of voice signals for discriminating voice from noise
    • 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
    • G10L21/0216—Noise filtering characterised by the method used for estimating noise
    • G10L2021/02161—Number of inputs available containing the signal or the noise to be suppressed
    • G10L2021/02165—Two microphones, one receiving mainly the noise signal and the other one mainly the speech signal
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04R—LOUDSPEAKERS, MICROPHONES, GRAMOPHONE PICK-UPS OR LIKE ACOUSTIC ELECTROMECHANICAL TRANSDUCERS; DEAF-AID SETS; PUBLIC ADDRESS SYSTEMS
    • H04R2410/00—Microphones
    • H04R2410/07—Mechanical or electrical reduction of wind noise generated by wind passing a microphone

Abstract

A method for improving the quality of a speech signal extracted from a noisy acoustic environment is provided. In one approach, a signal separation process (180) is associated with a voice activity detector (185). The voice activity detector (185) is a two-channel (178,182) detector, which enables a particularly robust and accurate detection of voice activity. When a speech is detected, the voice activity detector generates a control signal (411). The control signal (411) is used to activate, adjust, or control signal separation processes or post -processing operations (195) to improve the quality of the resulting speech signal. In another approach, a signal separation process (180) is provided as a learning stage (752) and an output stage (756). The learning stage (752) aggressively adjus to current acoustic conditions and passes coefficients to the output stage (756). The output stage (756) adapts more slowly and generates a speech-content signal (181,770) and a noise dominant signal (407,773). When the learning stage (752) becomes unstable only the learning stage (752) is reset, allowing the output stage (756) to continue outputting a high quality speech signal.
PCT/US2006/028627 2005-07-22 2006-07-21 Robust separation of speech signals in a noisy environment WO2007014136A2 (en)

Priority Applications (2)

Application Number Priority Date Filing Date Title
EP06788278A EP1908059A4 (en) 2005-07-22 2006-07-21 Robust separation of speech signals in a noisy environment
JP2008523036A JP2009503568A (en) 2005-07-22 2006-07-21 Steady separation of speech signals in noisy environments

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
US11/187,504 US7464029B2 (en) 2005-07-22 2005-07-22 Robust separation of speech signals in a noisy environment
US11/187,504 2005-07-22

Publications (3)

Publication Number Publication Date
WO2007014136A2 WO2007014136A2 (en) 2007-02-01
WO2007014136A3 true WO2007014136A3 (en) 2007-11-01
WO2007014136A9 WO2007014136A9 (en) 2008-05-15

Family

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Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/US2006/028627 WO2007014136A2 (en) 2005-07-22 2006-07-21 Robust separation of speech signals in a noisy environment

Country Status (6)

Country Link
US (1) US7464029B2 (en)
EP (1) EP1908059A4 (en)
JP (1) JP2009503568A (en)
KR (1) KR20080059147A (en)
CN (1) CN101278337A (en)
WO (1) WO2007014136A2 (en)

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