CA948305A - Unidirectional microphones - Google Patents
Unidirectional microphonesInfo
- 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
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
- H04R1/20—Arrangements for obtaining desired frequency or directional characteristics
- H04R1/32—Arrangements for obtaining desired frequency or directional characteristics for obtaining desired directional characteristic only
- H04R1/34—Arrangements 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
- H04R1/38—Arrangements 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
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)
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)
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 |
-
1971
- 1971-07-21 US US00164507A patent/US3715500A/en not_active Expired - Lifetime
-
1972
- 1972-01-27 CA CA133,304A patent/CA948305A/en not_active Expired
- 1972-07-17 AT AT613872A patent/AT322650B/en not_active IP Right Cessation
- 1972-07-18 DE DE2235169A patent/DE2235169C3/en not_active Expired
- 1972-07-19 GB GB3370472A patent/GB1407266A/en not_active Expired
- 1972-07-21 JP JP47072659A patent/JPS5219966B1/ja active Pending
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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