WO2001087009A3 - Gas flow sensor, speaker system and microphone - Google Patents

Gas flow sensor, speaker system and microphone Download PDF

Info

Publication number
WO2001087009A3
WO2001087009A3 PCT/CA2001/000647 CA0100647W WO0187009A3 WO 2001087009 A3 WO2001087009 A3 WO 2001087009A3 CA 0100647 W CA0100647 W CA 0100647W WO 0187009 A3 WO0187009 A3 WO 0187009A3
Authority
WO
WIPO (PCT)
Prior art keywords
membrane
feedback
frequency range
microphones
range
Prior art date
Application number
PCT/CA2001/000647
Other languages
French (fr)
Other versions
WO2001087009A2 (en
Inventor
Oleg Grudin
Gennadiy Flolov
Leslie M Landsberger
Original Assignee
Microbridge Technologies Inc
Oleg Grudin
Gennadiy Flolov
Leslie M Landsberger
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 Microbridge Technologies Inc, Oleg Grudin, Gennadiy Flolov, Leslie M Landsberger filed Critical Microbridge Technologies Inc
Priority to JP2001583100A priority Critical patent/JP2003532881A/en
Priority to US10/275,255 priority patent/US20040101153A1/en
Priority to CA002421291A priority patent/CA2421291A1/en
Priority to EP01929155A priority patent/EP1297721A2/en
Priority to AU2001256038A priority patent/AU2001256038A1/en
Publication of WO2001087009A2 publication Critical patent/WO2001087009A2/en
Publication of WO2001087009A3 publication Critical patent/WO2001087009A3/en

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
    • H04R3/00—Circuits for transducers, loudspeakers or microphones
    • H04R3/002—Damping circuit arrangements for transducers, e.g. motional feedback circuits
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04R—LOUDSPEAKERS, MICROPHONES, GRAMOPHONE PICK-UPS OR LIKE ACOUSTIC ELECTROMECHANICAL TRANSDUCERS; DEAF-AID SETS; PUBLIC ADDRESS SYSTEMS
    • H04R23/00—Transducers other than those covered by groups H04R9/00 - H04R21/00
    • H04R23/002—Transducers other than those covered by groups H04R9/00 - H04R21/00 using electrothermic-effect transducer
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04R—LOUDSPEAKERS, MICROPHONES, GRAMOPHONE PICK-UPS OR LIKE ACOUSTIC ELECTROMECHANICAL TRANSDUCERS; DEAF-AID SETS; PUBLIC ADDRESS SYSTEMS
    • H04R29/00—Monitoring arrangements; Testing arrangements
    • H04R29/001—Monitoring arrangements; Testing arrangements for loudspeakers

Abstract

This invention addresses a fundamental weakness in currently common microphones, and their applications in feedback for audio speaker systems. This limitation stems from the fundamental difficulties of typical membrane-type microphones in the frequency range 1-100Hz. The self-noise of membrane-type microphones increases in this range approximately as 1/f, and membrane-type microphones are sensitive to parasitic inertial vibrations, which are usually very important in this frequency range. The removal of these limitations enables the use of such a sensor (APV sensor) for effective feedback in audio speakers, dramatically improving performance in the low-frequency range of 10-100Hz. Without feedback, typical audio speakers suffer severe attenuation and/or distortion in this range.
PCT/CA2001/000647 2000-05-08 2001-05-08 Gas flow sensor, speaker system and microphone WO2001087009A2 (en)

Priority Applications (5)

Application Number Priority Date Filing Date Title
JP2001583100A JP2003532881A (en) 2000-05-08 2001-05-08 Gas flow sensor, speaker system, and microphone utilizing measurement of absolute pressure over time
US10/275,255 US20040101153A1 (en) 2001-05-08 2001-05-08 Gas flow sensor, speaker system and microphone, utilizing measurement absolute of time-variations in absolute pressure
CA002421291A CA2421291A1 (en) 2000-05-08 2001-05-08 Gas flow sensor, speaker system and microphone
EP01929155A EP1297721A2 (en) 2000-05-08 2001-05-08 Gas flow sensor, speaker system and microphone
AU2001256038A AU2001256038A1 (en) 2000-05-08 2001-05-08 Gas flow sensor, speaker system and microphone

Applications Claiming Priority (4)

Application Number Priority Date Filing Date Title
US20265300P 2000-05-08 2000-05-08
US20265500P 2000-05-08 2000-05-08
US60/202,653 2000-05-08
US60/202,655 2000-05-08

Publications (2)

Publication Number Publication Date
WO2001087009A2 WO2001087009A2 (en) 2001-11-15
WO2001087009A3 true WO2001087009A3 (en) 2003-01-03

Family

ID=26897905

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/CA2001/000647 WO2001087009A2 (en) 2000-05-08 2001-05-08 Gas flow sensor, speaker system and microphone

Country Status (5)

Country Link
EP (1) EP1297721A2 (en)
JP (1) JP2003532881A (en)
AU (1) AU2001256038A1 (en)
CA (1) CA2421291A1 (en)
WO (1) WO2001087009A2 (en)

Families Citing this family (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE102004010863B3 (en) * 2004-03-05 2005-10-20 Siemens Audiologische Technik Hearing aid with several microphones
JP2009250928A (en) * 2008-04-10 2009-10-29 Nippon Hoso Kyokai <Nhk> Mems type thermal beam type particle velocity detection element, its manufacturing method, and acoustic sensor
TWI463868B (en) * 2008-10-09 2014-12-01 Asia Optical Co Inc Scalable image sensing module

Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH04369481A (en) * 1991-06-14 1992-12-22 Honda Motor Co Ltd Gas rate sensor
DE4201216C1 (en) * 1992-01-18 1993-02-25 Gms Gesellschaft Fuer Mikrotechnik Und Sensorik Mbh, 7742 St Georgen, De Oxygen@ sensor for gas mixt. - measures difference in flow speed in two stream channels etched into wafer substrate by two thermo anemometers
US5523715A (en) * 1995-03-10 1996-06-04 Schrader; Daniel J. Amplifier arrangement and method and voltage controlled amplifier and method
EP0820210A2 (en) * 1997-08-20 1998-01-21 Phonak Ag A method for elctronically beam forming acoustical signals and acoustical sensorapparatus
DE19730931C1 (en) * 1997-07-18 1998-11-19 Karlsruhe Forschzent Volumetric flow sensor with linear characteristic
US5959217A (en) * 1994-06-24 1999-09-28 Hans Elias De Bree Fluid flow measuring device as a microphone and system comprising such a microphone

Patent Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH04369481A (en) * 1991-06-14 1992-12-22 Honda Motor Co Ltd Gas rate sensor
DE4201216C1 (en) * 1992-01-18 1993-02-25 Gms Gesellschaft Fuer Mikrotechnik Und Sensorik Mbh, 7742 St Georgen, De Oxygen@ sensor for gas mixt. - measures difference in flow speed in two stream channels etched into wafer substrate by two thermo anemometers
US5959217A (en) * 1994-06-24 1999-09-28 Hans Elias De Bree Fluid flow measuring device as a microphone and system comprising such a microphone
US5523715A (en) * 1995-03-10 1996-06-04 Schrader; Daniel J. Amplifier arrangement and method and voltage controlled amplifier and method
DE19730931C1 (en) * 1997-07-18 1998-11-19 Karlsruhe Forschzent Volumetric flow sensor with linear characteristic
EP0820210A2 (en) * 1997-08-20 1998-01-21 Phonak Ag A method for elctronically beam forming acoustical signals and acoustical sensorapparatus

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
PATENT ABSTRACTS OF JAPAN vol. 017, no. 254 (P - 1538) 19 May 1993 (1993-05-19) *

Also Published As

Publication number Publication date
EP1297721A2 (en) 2003-04-02
AU2001256038A1 (en) 2001-11-20
CA2421291A1 (en) 2001-11-15
JP2003532881A (en) 2003-11-05
WO2001087009A2 (en) 2001-11-15

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