CA2326879A1 - Signal enhancement for voice coding - Google Patents

Signal enhancement for voice coding Download PDF

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Publication number
CA2326879A1
CA2326879A1 CA002326879A CA2326879A CA2326879A1 CA 2326879 A1 CA2326879 A1 CA 2326879A1 CA 002326879 A CA002326879 A CA 002326879A CA 2326879 A CA2326879 A CA 2326879A CA 2326879 A1 CA2326879 A1 CA 2326879A1
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CA
Canada
Prior art keywords
signal
estimator
noise
filter
paths
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.)
Granted
Application number
CA002326879A
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French (fr)
Other versions
CA2326879C (en
Inventor
Dean Mcarthur
Jim Reilly
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.)
BlackBerry Ltd
Original Assignee
Research in Motion 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 Research in Motion Ltd filed Critical Research in Motion Ltd
Publication of CA2326879A1 publication Critical patent/CA2326879A1/en
Application granted granted Critical
Publication of CA2326879C publication Critical patent/CA2326879C/en
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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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
    • 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
    • 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
    • G10L2021/02166—Microphone arrays; Beamforming

Abstract

An adaptive noise suppression system includes an input AID converter, an analyzer, a filter, and a output D/A converter. The analyzer includes both feed-forward and feedback signal paths that allow it to compute a filtering coefficient, which is input to the filter. In these paths, feed-forward signal are processed by a signal to noise ratio estimator, a normalized coherence estimator, and a coherence mask. Also, feedback signals are processed by a auditory mask estimator. These two signal paths are coupled together via a noise suppression filter estimator. A method according to the present invention includes active signal processing to preserve speech-like signals and suppress incoherent noise signals. After a signal is processed in the feed-forward and feedback paths, the noise suppression filter estimator then outputs.a filtering coefficient signal to the filter for filtering the noise out of the speech and noise digital signal.
CA002326879A 1999-12-01 2000-11-24 Signal enhancement for voice coding Expired - Lifetime CA2326879C (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
US09/452,623 1999-12-01
US09/452,623 US6473733B1 (en) 1999-12-01 1999-12-01 Signal enhancement for voice coding

Publications (2)

Publication Number Publication Date
CA2326879A1 true CA2326879A1 (en) 2001-06-01
CA2326879C CA2326879C (en) 2006-05-30

Family

ID=23797227

Family Applications (1)

Application Number Title Priority Date Filing Date
CA002326879A Expired - Lifetime CA2326879C (en) 1999-12-01 2000-11-24 Signal enhancement for voice coding

Country Status (5)

Country Link
US (3) US6473733B1 (en)
EP (1) EP1107235B1 (en)
AT (1) ATE343200T1 (en)
CA (1) CA2326879C (en)
DE (1) DE60031354T2 (en)

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Also Published As

Publication number Publication date
EP1107235B1 (en) 2006-10-18
US6473733B1 (en) 2002-10-29
EP1107235A3 (en) 2002-09-18
CA2326879C (en) 2006-05-30
ATE343200T1 (en) 2006-11-15
DE60031354T2 (en) 2007-08-23
US20040015348A1 (en) 2004-01-22
DE60031354D1 (en) 2006-11-30
US20030028372A1 (en) 2003-02-06
US6647367B2 (en) 2003-11-11
US7174291B2 (en) 2007-02-06
EP1107235A2 (en) 2001-06-13

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