GB1007891A - Improvements in an electroacoustic transducer - Google Patents
Improvements in an electroacoustic transducerInfo
- Publication number
- GB1007891A GB1007891A GB23000/62A GB2300062A GB1007891A GB 1007891 A GB1007891 A GB 1007891A GB 23000/62 A GB23000/62 A GB 23000/62A GB 2300062 A GB2300062 A GB 2300062A GB 1007891 A GB1007891 A GB 1007891A
- Authority
- GB
- United Kingdom
- Prior art keywords
- microphone
- pressure
- capacitance
- gradient
- june
- 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
-
- 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
- H04R3/005—Circuits for transducers, loudspeakers or microphones for combining the signals of two or more microphones
-
- 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
- H04R2410/01—Noise reduction using microphones having different directional characteristics
Landscapes
- Health & Medical Sciences (AREA)
- Otolaryngology (AREA)
- Physics & Mathematics (AREA)
- Engineering & Computer Science (AREA)
- Acoustics & Sound (AREA)
- Signal Processing (AREA)
- General Health & Medical Sciences (AREA)
- Electrostatic, Electromagnetic, Magneto- Strictive, And Variable-Resistance Transducers (AREA)
Abstract
1,007,891. Directional microphones. AKUTISCHE U. KINO-GERATE G.m.b.H. June 14, 1962 [June 19, 1961], No. 23000/62. Headings H4J and H4R. In an arrangement for obtaining a unidirectional effect for the reception of sound from varying distances, a pressure-gradient microphone has combined with it an adjustable resistive-capacitive electric or acoustic attenuator which controls the attenuation of sound arriving at the rear of the microphone. In Fig. 1, the outputs of a pressure microphone 1 and a pressure-gradient microphone 2 are combined after amplification, and the circuit of the latter includes a resistance-capacitance network which is variable by a switch U. Figs. 2, 4 show a single pressure-gradient condensed microphone having a diaphragm 5. In Fig. 2, a phase-shift acoustic network is formed by a capacitance C constituted by a cavity and a frictional resistance R with a duct 7 leading to a chamber C<SP>1</SP> provided with an adjustable gap R<SP>1</SP>. In Fig. 4, the capacitance C is formed by an annular space communicating with the diaphragm 5 by way of an adjustable gap R<SP>11</SP>. The microphone may take a cylindrical form with annular adjusting rings associated with distance-graduated scales.
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
AT474961A AT226290B (en) | 1961-06-19 | 1961-06-19 | Sound receiver with preferably one-sided, optionally adjustable directional characteristic, containing one or more transducer systems working according to the electrostatic principle |
Publications (1)
Publication Number | Publication Date |
---|---|
GB1007891A true GB1007891A (en) | 1965-10-22 |
Family
ID=3567868
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
GB23000/62A Expired GB1007891A (en) | 1961-06-19 | 1962-06-14 | Improvements in an electroacoustic transducer |
Country Status (4)
Country | Link |
---|---|
US (1) | US3223782A (en) |
AT (1) | AT226290B (en) |
DE (1) | DE1162415B (en) |
GB (1) | GB1007891A (en) |
Families Citing this family (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US3305638A (en) * | 1964-02-17 | 1967-02-21 | Steven D Teachout | Condenser microphone circuit with solid electrolyte battery polarizing source |
US3777079A (en) * | 1971-10-21 | 1973-12-04 | Willco Gmbh | Directional microphone for head mounted midget hearing aids |
JPS5825675Y2 (en) * | 1977-09-07 | 1983-06-02 | 松下電器産業株式会社 | Polymer piezoelectric transducer |
Family Cites Families (10)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE912821C (en) * | 1935-11-13 | 1954-06-03 | Siemens Ag | Facility for voice transmission from noisy rooms |
DE924807C (en) * | 1936-10-09 | 1955-03-07 | Siemens Ag | Facility for voice transmission from noisy rooms |
US2173219A (en) * | 1937-05-29 | 1939-09-19 | Rca Corp | Electroacoustical apparatus |
US2309109A (en) * | 1937-06-04 | 1943-01-26 | Rca Corp | Microphone |
BE441589A (en) * | 1939-11-24 | |||
CH281609A (en) * | 1949-02-22 | 1952-03-15 | Rundfunk Nordwestdeutscher | Method for changing the directional characteristic of a sound receiver consisting of several individual microphones |
DE927037C (en) * | 1949-02-23 | 1955-04-28 | Nordwestdeutscher Rundfunk | Capacitive microphone with changeable directional characteristic |
DE1044170B (en) * | 1952-08-14 | 1958-11-20 | Schoeps Dr Ing Karl | Microphone arrangement to achieve a directional characteristic for preferably one-sided sound pick-up |
US3061690A (en) * | 1958-09-15 | 1962-10-30 | Turner Company | Acoustically compensated microphone with adjustable acoustic resistance |
NL249090A (en) * | 1959-03-04 |
-
1961
- 1961-06-19 AT AT474961A patent/AT226290B/en active
-
1962
- 1962-02-22 DE DEA39536A patent/DE1162415B/en active Pending
- 1962-06-12 US US201958A patent/US3223782A/en not_active Expired - Lifetime
- 1962-06-14 GB GB23000/62A patent/GB1007891A/en not_active Expired
Also Published As
Publication number | Publication date |
---|---|
AT226290B (en) | 1963-03-11 |
DE1162415B (en) | 1964-02-06 |
US3223782A (en) | 1965-12-14 |
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