CA2252447A1 - A directional hearing system - Google Patents

A directional hearing system

Info

Publication number
CA2252447A1
CA2252447A1 CA2252447A CA2252447A CA2252447A1 CA 2252447 A1 CA2252447 A1 CA 2252447A1 CA 2252447 A CA2252447 A CA 2252447A CA 2252447 A CA2252447 A CA 2252447A CA 2252447 A1 CA2252447 A1 CA 2252447A1
Authority
CA
Canada
Prior art keywords
user
magnetic field
microphone
signals
receiving
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
CA2252447A
Other languages
French (fr)
Other versions
CA2252447C (en
Inventor
Bernard Widrow
Michael A. Lehr
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.)
Cardinal Sound Labs Inc
Original Assignee
Bernard Widrow
Cardinal Sound Labs, Inc.
Michael A. Lehr
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 Bernard Widrow, Cardinal Sound Labs, Inc., Michael A. Lehr filed Critical Bernard Widrow
Publication of CA2252447A1 publication Critical patent/CA2252447A1/en
Application granted granted Critical
Publication of CA2252447C publication Critical patent/CA2252447C/en
Anticipated expiration legal-status Critical
Expired - Fee Related 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
    • H04R25/00—Deaf-aid sets, i.e. electro-acoustic or electro-mechanical hearing aids; Electric tinnitus maskers providing an auditory perception
    • H04R25/55—Deaf-aid sets, i.e. electro-acoustic or electro-mechanical hearing aids; Electric tinnitus maskers providing an auditory perception using an external connection, either wireless or wired
    • H04R25/554—Deaf-aid sets, i.e. electro-acoustic or electro-mechanical hearing aids; Electric tinnitus maskers providing an auditory perception using an external connection, either wireless or wired using a wireless connection, e.g. between microphone and amplifier or using Tcoils
    • 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
    • H04R25/40—Arrangements for obtaining a desired directivity characteristic
    • H04R25/407—Circuits for combining signals of a plurality of transducers
    • 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
    • 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
    • H04R25/40—Arrangements for obtaining a desired directivity characteristic
    • H04R25/405—Arrangements for obtaining a desired directivity characteristic by combining a plurality of transducers

Abstract

A directional acoustic receiving system is constructed in the form of a necklace including an array of two or more microphones mounted on a housing supported on the chest of a user by a conducting loop encircling the user's neck. Signal processing electronics contained in the same housing receives and combines the microphone signals in such a manner as to provide an amplified output signal which emphasizes sounds of interest arriving in a direction forward of the user. The amplified output signal drives the supporting conducting loop to produce a representative magnetic field. An electroacoustic transducer including a magnetic field pick-up coil for receiving the magnetic field is mounted in or on the user's ear and generates an acoustic signal representative of the sounds of interest. The microphone output signals are weighted (scaled) and combined to achieve desired spatial directivity responses. The weighting coefficients are determined by an optimization process. By bandpass filtering the weighted microphone signals with a set of filters covering the audio frequency range and summing the filtered signals, a receiving microphone array with a small aperture size is caused to have a directivity pattern that is essentially uniform over frequency in two or three dimensions. This method enables the design of highly-directive hearing instruments which are comfortable, inconspicuous, and convenient to use. The invention provides the user with a dramatic improvement in speech perception over existing hearing aid designs, particularly in the presence of background noise and reverberation.
CA002252447A 1996-04-22 1997-04-17 A directional hearing system Expired - Fee Related CA2252447C (en)

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
US08/635,550 US5793875A (en) 1996-04-22 1996-04-22 Directional hearing system
US08/635,550 1996-04-22
PCT/US1997/006385 WO1997040645A1 (en) 1996-04-22 1997-04-17 A directional hearing system

Publications (2)

Publication Number Publication Date
CA2252447A1 true CA2252447A1 (en) 1997-10-30
CA2252447C CA2252447C (en) 1999-09-21

Family

ID=24548230

Family Applications (1)

Application Number Title Priority Date Filing Date
CA002252447A Expired - Fee Related CA2252447C (en) 1996-04-22 1997-04-17 A directional hearing system

Country Status (5)

Country Link
US (1) US5793875A (en)
EP (1) EP0895705A1 (en)
AU (1) AU2732897A (en)
CA (1) CA2252447C (en)
WO (1) WO1997040645A1 (en)

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Also Published As

Publication number Publication date
EP0895705A1 (en) 1999-02-10
WO1997040645A1 (en) 1997-10-30
US5793875A (en) 1998-08-11
CA2252447C (en) 1999-09-21
AU2732897A (en) 1997-11-12

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