FR2545302B1 - ACOUSTIC FILTER FOR A TRANSDUCER IN PARTICULAR OF THE ELECTROMAGNETIC TYPE OF TELEPHONE HANDSET - Google Patents

ACOUSTIC FILTER FOR A TRANSDUCER IN PARTICULAR OF THE ELECTROMAGNETIC TYPE OF TELEPHONE HANDSET

Info

Publication number
FR2545302B1
FR2545302B1 FR8306829A FR8306829A FR2545302B1 FR 2545302 B1 FR2545302 B1 FR 2545302B1 FR 8306829 A FR8306829 A FR 8306829A FR 8306829 A FR8306829 A FR 8306829A FR 2545302 B1 FR2545302 B1 FR 2545302B1
Authority
FR
France
Prior art keywords
transducer
electromagnetic type
telephone handset
acoustic filter
acoustic
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
FR8306829A
Other languages
French (fr)
Other versions
FR2545302A1 (en
Inventor
Claude Jean-Angele
Denis Guillou
Jean-Claude Pouzenc
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.)
Thales SA
ALE International SAS
Original Assignee
Thomson CSF Telephone SA
Le Materiel Telephonique Thomson CSF
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 Thomson CSF Telephone SA, Le Materiel Telephonique Thomson CSF filed Critical Thomson CSF Telephone SA
Priority to FR8306829A priority Critical patent/FR2545302B1/en
Publication of FR2545302A1 publication Critical patent/FR2545302A1/en
Application granted granted Critical
Publication of FR2545302B1 publication Critical patent/FR2545302B1/en
Expired legal-status Critical Current

Links

Classifications

    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04M—TELEPHONIC COMMUNICATION
    • H04M1/00—Substation equipment, e.g. for use by subscribers
    • H04M1/02—Constructional features of telephone sets
    • H04M1/20—Arrangements for preventing acoustic feed-back
    • 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
    • H04R1/22—Arrangements for obtaining desired frequency or directional characteristics for obtaining desired frequency characteristic only 
FR8306829A 1983-04-26 1983-04-26 ACOUSTIC FILTER FOR A TRANSDUCER IN PARTICULAR OF THE ELECTROMAGNETIC TYPE OF TELEPHONE HANDSET Expired FR2545302B1 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
FR8306829A FR2545302B1 (en) 1983-04-26 1983-04-26 ACOUSTIC FILTER FOR A TRANSDUCER IN PARTICULAR OF THE ELECTROMAGNETIC TYPE OF TELEPHONE HANDSET

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
FR8306829A FR2545302B1 (en) 1983-04-26 1983-04-26 ACOUSTIC FILTER FOR A TRANSDUCER IN PARTICULAR OF THE ELECTROMAGNETIC TYPE OF TELEPHONE HANDSET

Publications (2)

Publication Number Publication Date
FR2545302A1 FR2545302A1 (en) 1984-11-02
FR2545302B1 true FR2545302B1 (en) 1989-01-13

Family

ID=9288216

Family Applications (1)

Application Number Title Priority Date Filing Date
FR8306829A Expired FR2545302B1 (en) 1983-04-26 1983-04-26 ACOUSTIC FILTER FOR A TRANSDUCER IN PARTICULAR OF THE ELECTROMAGNETIC TYPE OF TELEPHONE HANDSET

Country Status (1)

Country Link
FR (1) FR2545302B1 (en)

Families Citing this family (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO1989004106A1 (en) * 1987-10-28 1989-05-05 Acs Communications, Inc. Acoustic filter microphone cup
US4864611A (en) * 1987-11-24 1989-09-05 Helmuth Keld T Telephone handset attachment for use in-the-ear hearing aids
US4974258A (en) * 1989-07-21 1990-11-27 Raytel, Inc. Vandal-proof handset for a pay telephone
DE4016879C1 (en) * 1990-05-25 1991-09-19 Hagenuk Telecom Gmbh
FR2686756A1 (en) * 1992-01-29 1993-07-30 Alcatel Business Systems Apparatus including an elastomer membrane for a touch-sensitive keyboard, and a microphone housing forming an acoustic filter produced in the elastomer membrane

Family Cites Families (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2236568A (en) * 1939-07-29 1941-04-01 Bell Telephone Labor Inc Receiver cap acoustic filter
US2820107A (en) * 1954-12-22 1958-01-14 Sonotonc Corp Electro-mechanical signal transducers
US3645354A (en) * 1970-10-01 1972-02-29 Telex Corp The Earphone pad
DE2852176C2 (en) * 1978-12-02 1985-06-05 Telefonbau Und Normalzeit Gmbh, 6000 Frankfurt Arrangement for leveling the frequency curve in an electroacoustic transducer
GB2064265B (en) * 1979-11-30 1984-01-11 Pye Electronic Prod Ltd Microphone unit
DE3107293A1 (en) * 1981-02-26 1982-09-09 Siemens AG, 1000 Berlin und 8000 München Arrangement for frequency response improvement of electro-acoustic transducers

Also Published As

Publication number Publication date
FR2545302A1 (en) 1984-11-02

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Legal Events

Date Code Title Description
ST Notification of lapse