CA2090297A1 - Adaptive noise reduction circuit for a sound reproduction system - Google Patents

Adaptive noise reduction circuit for a sound reproduction system

Info

Publication number
CA2090297A1
CA2090297A1 CA002090297A CA2090297A CA2090297A1 CA 2090297 A1 CA2090297 A1 CA 2090297A1 CA 002090297 A CA002090297 A CA 002090297A CA 2090297 A CA2090297 A CA 2090297A CA 2090297 A1 CA2090297 A1 CA 2090297A1
Authority
CA
Canada
Prior art keywords
noise
signal
circuit
noise reduction
reduction circuit
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
CA002090297A
Other languages
French (fr)
Other versions
CA2090297C (en
Inventor
A. Maynard Engebretson
Michael P. O'connell
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.)
K/S Himpp
Original Assignee
A. Maynard Engebretson
Michael P. O'connell
Central Institute For The Deaf
Resound Corporation
K/S Himpp
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 A. Maynard Engebretson, Michael P. O'connell, Central Institute For The Deaf, Resound Corporation, K/S Himpp filed Critical A. Maynard Engebretson
Publication of CA2090297A1 publication Critical patent/CA2090297A1/en
Application granted granted Critical
Publication of CA2090297C publication Critical patent/CA2090297C/en
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

Links

Classifications

    • 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
    • H04R1/02—Casings; Cabinets ; Supports therefor; Mountings therein
    • H04R1/04—Structural association of microphone with electric circuitry therefor
    • 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
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04R—LOUDSPEAKERS, MICROPHONES, GRAMOPHONE PICK-UPS OR LIKE ACOUSTIC ELECTROMECHANICAL TRANSDUCERS; DEAF-AID SETS; PUBLIC ADDRESS SYSTEMS
    • H04R25/00—Deaf-aid sets, i.e. electro-acoustic or electro-mechanical hearing aids; Electric tinnitus maskers providing an auditory perception
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04R—LOUDSPEAKERS, MICROPHONES, GRAMOPHONE PICK-UPS OR LIKE ACOUSTIC ELECTROMECHANICAL TRANSDUCERS; DEAF-AID SETS; PUBLIC ADDRESS SYSTEMS
    • H04R25/00—Deaf-aid sets, i.e. electro-acoustic or electro-mechanical hearing aids; Electric tinnitus maskers providing an auditory perception
    • H04R25/50—Customised settings for obtaining desired overall acoustical characteristics
    • H04R25/505—Customised settings for obtaining desired overall acoustical characteristics using digital signal processing
    • 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
    • G10L2021/02163—Only one microphone
    • 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
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04R—LOUDSPEAKERS, MICROPHONES, GRAMOPHONE PICK-UPS OR LIKE ACOUSTIC ELECTROMECHANICAL TRANSDUCERS; DEAF-AID SETS; PUBLIC ADDRESS SYSTEMS
    • H04R2225/00—Details of deaf aids covered by H04R25/00, not provided for in any of its subgroups
    • H04R2225/41—Detection or adaptation of hearing aid parameters or programs to listening situation, e.g. pub, forest

Abstract

A noise reduction circuit for a hearing aid having an adaptive filter for producing a signal which estimates the noise components present in an input signal. The circuit includes a second filter for receiving the noise-estimating signal and modifying it as a function of a user's preference or as a function of an expected noise environment. The circuit also includes a gain control for adjusting the magnitude of the modified noise-estimating signal, thereby allowing for the adjustment of the magnitude of the circuit response.
The circuit also includes a signal combiner for combining the input signal with the adjusted noise-estimating signal to produce a noise reduced output signal.
CA002090297A 1992-02-27 1993-02-24 Adaptive noise reduction circuit for a sound reproduction system Expired - Lifetime CA2090297C (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
US07/842,566 US5412735A (en) 1992-02-27 1992-02-27 Adaptive noise reduction circuit for a sound reproduction system
US07/842,566 1992-02-27

Publications (2)

Publication Number Publication Date
CA2090297A1 true CA2090297A1 (en) 1993-08-28
CA2090297C CA2090297C (en) 2001-04-24

Family

ID=25287659

Family Applications (1)

Application Number Title Priority Date Filing Date
CA002090297A Expired - Lifetime CA2090297C (en) 1992-02-27 1993-02-24 Adaptive noise reduction circuit for a sound reproduction system

Country Status (9)

Country Link
US (1) US5412735A (en)
EP (1) EP0558312B1 (en)
JP (1) JP3040893B2 (en)
KR (1) KR100253539B1 (en)
AU (1) AU658476B2 (en)
CA (1) CA2090297C (en)
DE (1) DE69325529T2 (en)
DK (1) DK0558312T3 (en)
MY (1) MY131305A (en)

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US5412735A (en) 1995-05-02
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JPH077786A (en) 1995-01-10
CA2090297C (en) 2001-04-24
DK0558312T3 (en) 2000-01-31
EP0558312A1 (en) 1993-09-01
AU3304693A (en) 1993-09-02
AU658476B2 (en) 1995-04-13
MY131305A (en) 2007-08-30
KR100253539B1 (en) 2000-04-15
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DE69325529D1 (en) 1999-08-12
EP0558312B1 (en) 1999-07-07

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