WO2000048168A3 - Adaptive noise filter - Google Patents

Adaptive noise filter Download PDF

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Publication number
WO2000048168A3
WO2000048168A3 PCT/US2000/003535 US0003535W WO0048168A3 WO 2000048168 A3 WO2000048168 A3 WO 2000048168A3 US 0003535 W US0003535 W US 0003535W WO 0048168 A3 WO0048168 A3 WO 0048168A3
Authority
WO
WIPO (PCT)
Prior art keywords
level
noise
signal
noise filter
threshold level
Prior art date
Application number
PCT/US2000/003535
Other languages
French (fr)
Other versions
WO2000048168A2 (en
Inventor
Zezhang Hou
Original Assignee
Resound Corp
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 Resound Corp filed Critical Resound Corp
Priority to AU27592/00A priority Critical patent/AU2759200A/en
Publication of WO2000048168A2 publication Critical patent/WO2000048168A2/en
Publication of WO2000048168A3 publication Critical patent/WO2000048168A3/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
    • 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
    • G10L21/0232—Processing in the frequency domain
    • 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
    • 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
    • H04R2225/43—Signal processing in hearing aids to enhance the speech intelligibility
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04R—LOUDSPEAKERS, MICROPHONES, GRAMOPHONE PICK-UPS OR LIKE ACOUSTIC ELECTROMECHANICAL TRANSDUCERS; DEAF-AID SETS; PUBLIC ADDRESS SYSTEMS
    • H04R2430/00—Signal processing covered by H04R, not provided for in its groups
    • H04R2430/03—Synergistic effects of band splitting and sub-band processing
    • 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
    • H04R25/35—Deaf-aid sets, i.e. electro-acoustic or electro-mechanical hearing aids; Electric tinnitus maskers providing an auditory perception using translation techniques
    • H04R25/356—Amplitude, e.g. amplitude shift or compression

Abstract

A dynamic filter (20) uses a minimum level of an envelope signal to indicate the noise level of the environment. The noise level prefereably corresponds to blank spaces in the voice signal. This minimum level noise signal provides a simple dynamic indication of the noise. The noise level is used by threshold level generator (46) to set a threshold level, The threshold level and an envelope signal is used by an expander (48) to determine an attenuation value for an input signal. In the preferred embodiment, multiple frequency bands (32, 34) are individually processed.
PCT/US2000/003535 1999-02-10 2000-02-10 Adaptive noise filter WO2000048168A2 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
AU27592/00A AU2759200A (en) 1999-02-10 2000-02-10 Adaptive noise filter

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
US24762199A 1999-02-10 1999-02-10
US09/247,621 1999-02-10

Publications (2)

Publication Number Publication Date
WO2000048168A2 WO2000048168A2 (en) 2000-08-17
WO2000048168A3 true WO2000048168A3 (en) 2008-05-29

Family

ID=22935633

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/US2000/003535 WO2000048168A2 (en) 1999-02-10 2000-02-10 Adaptive noise filter

Country Status (2)

Country Link
AU (1) AU2759200A (en)
WO (1) WO2000048168A2 (en)

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE10122023A1 (en) * 2001-05-07 2002-11-21 Infineon Technologies Ag Arrangement and method for determining the current level of a digital signal
US8737654B2 (en) 2010-04-12 2014-05-27 Starkey Laboratories, Inc. Methods and apparatus for improved noise reduction for hearing assistance devices

Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4381488A (en) * 1981-02-18 1983-04-26 Fricke Jobst P Dynamic volume expander varying as a function of ambient noise level
US4461025A (en) * 1982-06-22 1984-07-17 Audiological Engineering Corporation Automatic background noise suppressor
US4887299A (en) * 1987-11-12 1989-12-12 Nicolet Instrument Corporation Adaptive, programmable signal processing hearing aid
US5524060A (en) * 1992-03-23 1996-06-04 Euphonix, Inc. Visuasl dynamics management for audio instrument
US5687285A (en) * 1993-12-25 1997-11-11 Sony Corporation Noise reducing method, noise reducing apparatus and telephone set

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4381488A (en) * 1981-02-18 1983-04-26 Fricke Jobst P Dynamic volume expander varying as a function of ambient noise level
US4461025A (en) * 1982-06-22 1984-07-17 Audiological Engineering Corporation Automatic background noise suppressor
US4887299A (en) * 1987-11-12 1989-12-12 Nicolet Instrument Corporation Adaptive, programmable signal processing hearing aid
US5524060A (en) * 1992-03-23 1996-06-04 Euphonix, Inc. Visuasl dynamics management for audio instrument
US5687285A (en) * 1993-12-25 1997-11-11 Sony Corporation Noise reducing method, noise reducing apparatus and telephone set

Also Published As

Publication number Publication date
WO2000048168A2 (en) 2000-08-17
AU2759200A (en) 2000-08-29

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