FR508443A - Perfectionnements aux transmetteurs téléphoniques - Google Patents

Perfectionnements aux transmetteurs téléphoniques

Info

Publication number
FR508443A
FR508443A FR508443A FR508443DA FR508443A FR 508443 A FR508443 A FR 508443A FR 508443 A FR508443 A FR 508443A FR 508443D A FR508443D A FR 508443DA FR 508443 A FR508443 A FR 508443A
Authority
FR
France
Prior art keywords
telephone transmitters
transmitters
telephone
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
FR508443A
Other languages
English (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.)
Philips North America LLC
Original Assignee
Magnavox Co
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 Magnavox Co filed Critical Magnavox Co
Application granted granted Critical
Publication of FR508443A publication Critical patent/FR508443A/fr
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

Landscapes

  • Health & Medical Sciences (AREA)
  • Otolaryngology (AREA)
  • Physics & Mathematics (AREA)
  • Engineering & Computer Science (AREA)
  • Acoustics & Sound (AREA)
  • Signal Processing (AREA)
  • Diaphragms For Electromechanical Transducers (AREA)
FR508443A 1920-01-06 1920-01-15 Perfectionnements aux transmetteurs téléphoniques Expired FR508443A (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
GB431/20A GB161277A (en) 1920-01-06 1920-01-06 Improvements in and relating to telephone transmitters
FR508443T 1920-01-15

Publications (1)

Publication Number Publication Date
FR508443A true FR508443A (fr) 1920-10-11

Family

ID=9704215

Family Applications (1)

Application Number Title Priority Date Filing Date
FR508443A Expired FR508443A (fr) 1920-01-06 1920-01-15 Perfectionnements aux transmetteurs téléphoniques

Country Status (2)

Country Link
FR (1) FR508443A (fr)
GB (1) GB161277A (fr)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2630610A1 (fr) * 1988-04-20 1989-10-27 Primo Cy Ltd Microphone directif

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2630610A1 (fr) * 1988-04-20 1989-10-27 Primo Cy Ltd Microphone directif

Also Published As

Publication number Publication date
GB161277A (en) 1921-04-06

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