GB1007891A - Improvements in an electroacoustic transducer - Google Patents

Improvements in an electroacoustic transducer

Info

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
Application number
GB23000/62A
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.)
AKUSTICHE U KINO GERAETE GES M
Original Assignee
AKUSTICHE U KINO GERAETE GES M
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 AKUSTICHE U KINO GERAETE GES M filed Critical AKUSTICHE U KINO GERAETE GES M
Publication of GB1007891A publication Critical patent/GB1007891A/en
Expired 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
    • 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.
GB23000/62A 1961-06-19 1962-06-14 Improvements in an electroacoustic transducer Expired GB1007891A (en)

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)

* Cited by examiner, † Cited by third party
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)

* Cited by examiner, † Cited by third party
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

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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