FR731938A - Perfectionnements aux microphones - Google Patents

Perfectionnements aux microphones

Info

Publication number: FR731938A
Authority: FR; France
Prior art keywords: refinements; microphone; microphone refinements
Prior art date: 1931-04-22
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

Inventor

Edouard Belin

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.)

1931-04-22

Filing date

1931-04-22

Publication date

1932-09-10

1931-04-22 Application filed filed Critical

1932-09-10 Application granted granted Critical

1932-09-10 Publication of FR731938A publication Critical patent/FR731938A/fr

Status Expired legal-status Critical Current

Classifications

- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04R—LOUDSPEAKERS, MICROPHONES, GRAMOPHONE PICK-UPS OR LIKE ACOUSTIC ELECTROMECHANICAL TRANSDUCERS; ELECTRIC HEARING AIDS; PUBLIC ADDRESS SYSTEMS
- H04R21/00—Variable-resistance transducers
- H04R21/04—Gramophone pick-ups using a stylus; Recorders using a stylus

Landscapes

Physics & Mathematics (AREA)
Engineering & Computer Science (AREA)
Acoustics & Sound (AREA)
Signal Processing (AREA)

FR731938D 1931-04-22 1931-04-22 Perfectionnements aux microphones Expired FR731938A (fr)

Applications Claiming Priority (1)

Application Number	Priority Date	Filing Date	Title
FR731938T		1931-04-22

Publications (1)

Publication Number	Publication Date
FR731938A true FR731938A (fr)	1932-09-10

Family

ID=9120118

Family Applications (1)

Application Number	Title	Priority Date	Filing Date
FR731938D Expired FR731938A (fr)	1931-04-22	1931-04-22	Perfectionnements aux microphones

Country Status (1)

Country	Link
FR (1)	FR731938A (fr)

1931
- 1931-04-22 FR FR731938D patent/FR731938A/fr not_active Expired

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