CA948305A - Unidirectional microphones - Google Patents

Unidirectional microphones

Info

Publication number
CA948305A
CA948305A CA133,304A CA133304A CA948305A CA 948305 A CA948305 A CA 948305A CA 133304 A CA133304 A CA 133304A CA 948305 A CA948305 A CA 948305A
Authority
CA
Canada
Prior art keywords
unidirectional microphones
microphones
unidirectional
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.)
Expired
Application number
CA133,304A
Other versions
CA133304S (en
Inventor
Gerhard M. Sessler
James E. West
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.)
AT&T Corp
Original Assignee
Western Electric Co Inc
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 Western Electric Co Inc filed Critical Western Electric Co Inc
Application granted granted Critical
Publication of CA948305A publication Critical patent/CA948305A/en
Expired legal-status Critical Current

Links

Classifications

    • HELECTRICITY
    • H04ELECTRIC COMMUNICATION TECHNIQUE
    • H04RLOUDSPEAKERS, MICROPHONES, GRAMOPHONE PICK-UPS OR LIKE ACOUSTIC ELECTROMECHANICAL TRANSDUCERS; DEAF-AID SETS; PUBLIC ADDRESS SYSTEMS
    • H04R1/00Details of transducers, loudspeakers or microphones
    • H04R1/20Arrangements for obtaining desired frequency or directional characteristics
    • H04R1/32Arrangements for obtaining desired frequency or directional characteristics for obtaining desired directional characteristic only
    • H04R1/34Arrangements for obtaining desired frequency or directional characteristics for obtaining desired directional characteristic only by using a single transducer with sound reflecting, diffracting, directing or guiding means
    • H04R1/38Arrangements for obtaining desired frequency or directional characteristics for obtaining desired directional characteristic only by using a single transducer with sound reflecting, diffracting, directing or guiding means in which sound waves act upon both sides of a diaphragm and incorporating acoustic phase-shifting means, e.g. pressure-gradient microphone
CA133,304A 1971-07-21 1972-01-27 Unidirectional microphones Expired CA948305A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
US16450771A 1971-07-21 1971-07-21

Publications (1)

Publication Number Publication Date
CA948305A true CA948305A (en) 1974-05-28

Family

ID=22594801

Family Applications (1)

Application Number Title Priority Date Filing Date
CA133,304A Expired CA948305A (en) 1971-07-21 1972-01-27 Unidirectional microphones

Country Status (6)

Country Link
US (1) US3715500A (en)
JP (1) JPS5219966B1 (en)
AT (1) AT322650B (en)
CA (1) CA948305A (en)
DE (1) DE2235169C3 (en)
GB (1) GB1407266A (en)

Families Citing this family (27)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB1515287A (en) * 1974-05-30 1978-06-21 Plessey Co Ltd Piezoelectric transducers
US4555598A (en) * 1983-09-21 1985-11-26 At&T Bell Laboratories Teleconferencing acoustic transducer
US4742548A (en) * 1984-12-20 1988-05-03 American Telephone And Telegraph Company Unidirectional second order gradient microphone
FI77347C (en) * 1987-04-23 1989-02-10 Uuden Teknologian Keskus Oy ANORDNING FOER ATT GOERA LAETTARE SAMTIDIGT TITTANDE OCH LYSSNANDE PAO ETT AVLAEGSET OBJEKT.
US5121426A (en) * 1989-12-22 1992-06-09 At&T Bell Laboratories Loudspeaking telephone station including directional microphone
US5226076A (en) * 1993-02-28 1993-07-06 At&T Bell Laboratories Directional microphone assembly
US5633935A (en) * 1993-04-13 1997-05-27 Matsushita Electric Industrial Co., Ltd. Stereo ultradirectional microphone apparatus
US5539834A (en) * 1994-11-03 1996-07-23 At&T Corp. Baffled microphone assembly
US5692060A (en) * 1995-05-01 1997-11-25 Knowles Electronics, Inc. Unidirectional microphone
US5745588A (en) * 1996-05-31 1998-04-28 Lucent Technologies Inc. Differential microphone assembly with passive suppression of resonances
US5848172A (en) * 1996-11-22 1998-12-08 Lucent Technologies Inc. Directional microphone
US6122389A (en) * 1998-01-20 2000-09-19 Shure Incorporated Flush mounted directional microphone
US7116792B1 (en) * 2000-07-05 2006-10-03 Gn Resound North America Corporation Directional microphone system
WO2002073673A1 (en) * 2001-03-13 2002-09-19 Rochester Institute Of Technology A micro-electro-mechanical switch and a method of using and making thereof
AU2002303933A1 (en) * 2001-05-31 2002-12-09 Rochester Institute Of Technology Fluidic valves, agitators, and pumps and methods thereof
US20030008676A1 (en) * 2001-07-03 2003-01-09 Baumhauer John Charles Communication device having a microphone system with optimal acoustic transmission line design for improved frequency and directional response
US6717488B2 (en) * 2001-09-13 2004-04-06 Nth Tech Corporation Resonator with a member having an embedded charge and a method of making thereof
US6842009B2 (en) * 2001-09-13 2005-01-11 Nth Tech Corporation Biohazard sensing system and methods thereof
US7378775B2 (en) * 2001-10-26 2008-05-27 Nth Tech Corporation Motion based, electrostatic power source and methods thereof
US7211923B2 (en) 2001-10-26 2007-05-01 Nth Tech Corporation Rotational motion based, electrostatic power source and methods thereof
US7217582B2 (en) 2003-08-29 2007-05-15 Rochester Institute Of Technology Method for non-damaging charge injection and a system thereof
US7287328B2 (en) * 2003-08-29 2007-10-30 Rochester Institute Of Technology Methods for distributed electrode injection
US8581308B2 (en) * 2004-02-19 2013-11-12 Rochester Institute Of Technology High temperature embedded charge devices and methods thereof
US20070074731A1 (en) * 2005-10-05 2007-04-05 Nth Tech Corporation Bio-implantable energy harvester systems and methods thereof
US7656749B2 (en) * 2007-09-04 2010-02-02 The United States Of America As Represented By The Secretary Of The Army Systems and methods for analyzing acoustic waves
NO20076609A (en) * 2007-12-21 2009-03-16 Tandberg Telecom As Microphone device
EP2551846B1 (en) * 2011-07-26 2022-01-19 AKG Acoustics GmbH Noise reducing sound reproduction

Family Cites Families (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2228886A (en) * 1938-10-31 1941-01-14 Rca Corp Electroacoustical apparatus
US2301744A (en) * 1941-05-31 1942-11-10 Rca Corp Electroacoustical signal translating apparatus
US2793255A (en) * 1950-11-13 1957-05-21 Rca Corp Third order, pressure gradient responsive microphone
US2699473A (en) * 1950-11-13 1955-01-11 Rca Corp Pressure gradient responsive microphone
US3573400A (en) * 1968-08-14 1971-04-06 Bell Telephone Labor Inc Directional microphone

Also Published As

Publication number Publication date
DE2235169B2 (en) 1973-07-26
US3715500A (en) 1973-02-06
JPS5219966B1 (en) 1977-05-31
AT322650B (en) 1975-05-26
DE2235169A1 (en) 1973-02-01
GB1407266A (en) 1975-09-24
DE2235169C3 (en) 1974-02-21

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