GB2003364A - Electroacoustic transducer for a microphone - Google Patents

Electroacoustic transducer for a microphone

Info

Publication number
GB2003364A
GB2003364A GB7834029A GB7834029A GB2003364A GB 2003364 A GB2003364 A GB 2003364A GB 7834029 A GB7834029 A GB 7834029A GB 7834029 A GB7834029 A GB 7834029A GB 2003364 A GB2003364 A GB 2003364A
Authority
GB
United Kingdom
Prior art keywords
microphone
electroacoustic transducer
electret
capacitance
impedance
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.)
Granted
Application number
GB7834029A
Other versions
GB2003364B (en
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.)
Post Office
Original Assignee
Post Office
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 Post Office filed Critical Post Office
Publication of GB2003364A publication Critical patent/GB2003364A/en
Application granted granted Critical
Publication of GB2003364B publication Critical patent/GB2003364B/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
    • H04R19/00—Electrostatic transducers
    • H04R19/01—Electrostatic transducers characterised by the use of electrets
    • H04R19/016—Electrostatic transducers characterised by the use of electrets for microphones
    • 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
    • H04R3/04—Circuits for transducers, loudspeakers or microphones for correcting frequency response
    • H04R3/06—Circuits for transducers, loudspeakers or microphones for correcting frequency response of electrostatic transducers

Abstract

In order to reduce the input impedance required of an amplifier connected to an electret microphone the electret microphone has a reduced impedance. The reduced impedance is provided by arranging for an additional capacitance Cs to be connected in parallel with the capacitance Ce inherent in the electret transducer. <IMAGE>
GB7834029A 1977-08-24 1978-08-21 Electroacoustic transducer for a microphone Expired GB2003364B (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
GB3546177 1977-08-24

Publications (2)

Publication Number Publication Date
GB2003364A true GB2003364A (en) 1979-03-07
GB2003364B GB2003364B (en) 1982-03-03

Family

ID=10377992

Family Applications (1)

Application Number Title Priority Date Filing Date
GB7834029A Expired GB2003364B (en) 1977-08-24 1978-08-21 Electroacoustic transducer for a microphone

Country Status (2)

Country Link
US (1) US4361735A (en)
GB (1) GB2003364B (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE19548041A1 (en) * 1994-12-28 1996-07-11 Yoshiro Tomikawa Driver for electrostatic transducer for use with piezoelectric oscillator

Families Citing this family (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DK170196B1 (en) * 1993-04-07 1995-06-06 Brueel & Kjaer As Method and coupling to reduce the harmonic distortion of a capacitive transducer
US6160450A (en) * 1999-04-09 2000-12-12 National Semiconductor Corporation Self-biased, phantom-powered and feedback-stabilized amplifier for electret microphone
JP4057212B2 (en) * 2000-02-15 2008-03-05 三菱電機株式会社 Microphone device

Family Cites Families (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US1027494A (en) * 1910-04-28 1912-05-28 Mcmeen & Miller Telephone-receiver.
US2755796A (en) * 1951-03-27 1956-07-24 Radio Patents Company Electrostatic transducers
GB832276A (en) * 1958-12-02 1960-04-06 Standard Telephones Cables Ltd Improvements in or relating to electro-acoustic transducers
US3373251A (en) * 1965-02-23 1968-03-12 Shure Bros Electrostatic transducer
NL7313455A (en) * 1973-10-01 1975-04-03 Philips Nv MICROPHONE WITH ELECTROSTATIC CAPSULE.

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE19548041A1 (en) * 1994-12-28 1996-07-11 Yoshiro Tomikawa Driver for electrostatic transducer for use with piezoelectric oscillator
DE19548041C2 (en) * 1994-12-28 1999-04-29 Yoshiro Tomikawa Driver device for an electrostatic converter device

Also Published As

Publication number Publication date
US4361735A (en) 1982-11-30
GB2003364B (en) 1982-03-03

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Legal Events

Date Code Title Description
732 Registration of transactions, instruments or events in the register (sect. 32/1977)
PCNP Patent ceased through non-payment of renewal fee

Effective date: 19970821