FR799518A - Improvements to acoustic or similar devices - Google Patents

Improvements to acoustic or similar devices

Info

Publication number
FR799518A
FR799518A FR799518DA FR799518A FR 799518 A FR799518 A FR 799518A FR 799518D A FR799518D A FR 799518DA FR 799518 A FR799518 A FR 799518A
Authority
FR
France
Prior art keywords
acoustic
similar devices
similar
devices
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
Other languages
French (fr)
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
Original Assignee
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 Le Materiel Telephonique Thomson CSF filed Critical Le Materiel Telephonique Thomson CSF
Application granted granted Critical
Publication of FR799518A publication Critical patent/FR799518A/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
    • H04R1/22—Arrangements for obtaining desired frequency or directional characteristics for obtaining desired frequency characteristic only 
    • H04R1/222—Arrangements for obtaining desired frequency or directional characteristics for obtaining desired frequency characteristic only  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
    • 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 
    • 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

Landscapes

  • Health & Medical Sciences (AREA)
  • Otolaryngology (AREA)
  • Physics & Mathematics (AREA)
  • Engineering & Computer Science (AREA)
  • Acoustics & Sound (AREA)
  • Signal Processing (AREA)
  • Audible-Bandwidth Dynamoelectric Transducers Other Than Pickups (AREA)
FR799518D 1934-12-29 1935-12-14 Improvements to acoustic or similar devices Expired FR799518A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
US759679A US2126566A (en) 1934-12-29 1934-12-29 Acoustic device

Publications (1)

Publication Number Publication Date
FR799518A true FR799518A (en) 1936-06-15

Family

ID=25056553

Family Applications (1)

Application Number Title Priority Date Filing Date
FR799518D Expired FR799518A (en) 1934-12-29 1935-12-14 Improvements to acoustic or similar devices

Country Status (5)

Country Link
US (1) US2126566A (en)
BE (1) BE412830A (en)
FR (1) FR799518A (en)
GB (1) GB464996A (en)
NL (2) NL45821C (en)

Families Citing this family (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB552328A (en) * 1941-12-04 1943-04-01 Reslo Sound Equipment Ltd Improvements in or relating to loud speakers and the like
US2515031A (en) * 1948-03-31 1950-07-11 Bell Telephone Labor Inc Microphone having controllable directional response pattern
US2702318A (en) * 1951-01-10 1955-02-15 Astatic Corp Unidirectional microphone
DE1073545B (en) * 1953-06-02 1960-01-21 Akustische u Kino Gerate Ges mbH, Wien Dynamic directional microphone
US3342285A (en) * 1966-12-19 1967-09-19 Standard Systems Comm Corp Combination pillow speaker and control unit
GB2168875A (en) * 1984-12-19 1986-06-25 Philips Electronic Associated Electroacoustic calling device

Also Published As

Publication number Publication date
BE412830A (en)
NL45821C (en)
US2126566A (en) 1938-08-09
GB464996A (en) 1937-04-29
NL43957C (en)

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