DE3856280T2 - Rauschunterdrückungssystem - Google Patents

Rauschunterdrückungssystem

Info

Publication number
DE3856280T2
DE3856280T2 DE3856280T DE3856280T DE3856280T2 DE 3856280 T2 DE3856280 T2 DE 3856280T2 DE 3856280 T DE3856280 T DE 3856280T DE 3856280 T DE3856280 T DE 3856280T DE 3856280 T2 DE3856280 T2 DE 3856280T2
Authority
DE
Germany
Prior art keywords
noise reduction
reduction system
noise
reduction
Prior art date
Legal status (The legal status 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 status listed.)
Expired - Lifetime
Application number
DE3856280T
Other languages
English (en)
Other versions
DE3856280D1 (de
Inventor
Richard Vilmur
Joseph Barlo
Ira Gerson
Brett Lindsley
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Motorola Solutions Inc
Original Assignee
Motorola 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 Motorola Inc filed Critical Motorola Inc
Publication of DE3856280D1 publication Critical patent/DE3856280D1/de
Application granted granted Critical
Publication of DE3856280T2 publication Critical patent/DE3856280T2/de
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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
    • 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
    • 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
    • G10L2021/02085—Periodic 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
    • G10L2021/02168—Noise filtering characterised by the method used for estimating noise the estimation exclusively taking place during speech pauses
    • 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
    • G10L2025/783—Detection of presence or absence of voice signals based on threshold decision
    • G10L2025/786—Adaptive threshold
    • 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
    • G10L25/93—Discriminating between voiced and unvoiced parts of speech signals
    • G10L2025/937—Signal energy in various frequency bands
DE3856280T 1987-10-01 1988-09-22 Rauschunterdrückungssystem Expired - Lifetime DE3856280T2 (de)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
US07/103,857 US4811404A (en) 1987-10-01 1987-10-01 Noise suppression system
PCT/US1988/003269 WO1989003141A1 (en) 1987-10-01 1988-09-22 Improved noise suppression system

Publications (2)

Publication Number Publication Date
DE3856280D1 DE3856280D1 (de) 1999-01-21
DE3856280T2 true DE3856280T2 (de) 1999-08-12

Family

ID=22297382

Family Applications (1)

Application Number Title Priority Date Filing Date
DE3856280T Expired - Lifetime DE3856280T2 (de) 1987-10-01 1988-09-22 Rauschunterdrückungssystem

Country Status (6)

Country Link
US (1) US4811404A (de)
EP (1) EP0380563B1 (de)
JP (1) JP2995737B2 (de)
KR (1) KR970000789B1 (de)
DE (1) DE3856280T2 (de)
WO (1) WO1989003141A1 (de)

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EP0380563A4 (en) 1991-04-03
DE3856280D1 (de) 1999-01-21
KR970000789B1 (ko) 1997-01-20
US4811404A (en) 1989-03-07
WO1989003141A1 (en) 1989-04-06
KR890702356A (ko) 1989-12-23
EP0380563B1 (de) 1998-12-09
EP0380563A1 (de) 1990-08-08
JPH03500347A (ja) 1991-01-24
JP2995737B2 (ja) 1999-12-27

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