FR841086A - Earpiece horn for telephone receiver or mouthpiece for microphones - Google Patents
Earpiece horn for telephone receiver or mouthpiece for microphonesInfo
- Publication number
- FR841086A FR841086A FR841086DA FR841086A FR 841086 A FR841086 A FR 841086A FR 841086D A FR841086D A FR 841086DA FR 841086 A FR841086 A FR 841086A
- Authority
- FR
- France
- Prior art keywords
- earpiece
- mouthpiece
- microphones
- horn
- telephone receiver
- 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
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
Landscapes
- Health & Medical Sciences (AREA)
- Otolaryngology (AREA)
- Physics & Mathematics (AREA)
- Engineering & Computer Science (AREA)
- Acoustics & Sound (AREA)
- Signal Processing (AREA)
- Obtaining Desirable Characteristics In Audible-Bandwidth Transducers (AREA)
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
DK55033T | 1936-10-05 | ||
FR841086T | 1938-07-25 |
Publications (1)
Publication Number | Publication Date |
---|---|
FR841086A true FR841086A (en) | 1939-05-10 |
Family
ID=8142986
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
FR841086D Expired FR841086A (en) | 1936-10-05 | 1938-07-25 | Earpiece horn for telephone receiver or mouthpiece for microphones |
Country Status (5)
Country | Link |
---|---|
US (1) | US2153044A (en) |
CH (1) | CH200196A (en) |
DK (1) | DK55033C (en) |
FR (1) | FR841086A (en) |
GB (1) | GB487566A (en) |
Families Citing this family (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE847921C (en) * | 1950-10-29 | 1952-08-28 | Lab Wennebostel Dr Ing Sennhei | Loudspeaker with pipeline |
DE940167C (en) * | 1953-07-01 | 1956-03-15 | Carl Schmidbauer | Speech device for a microphone that is insensitive to room noise and free of acoustic feedback |
US3084229A (en) * | 1960-03-11 | 1963-04-02 | Ampex | Electrostatic earphone |
US4189627A (en) * | 1978-11-27 | 1980-02-19 | Bell Telephone Laboratories, Incorporated | Electroacoustic transducer filter assembly |
-
1936
- 1936-10-05 DK DK55033D patent/DK55033C/en active
-
1937
- 1937-10-02 CH CH200196D patent/CH200196A/en unknown
- 1937-10-05 GB GB27356/37A patent/GB487566A/en not_active Expired
- 1937-10-05 US US167335A patent/US2153044A/en not_active Expired - Lifetime
-
1938
- 1938-07-25 FR FR841086D patent/FR841086A/en not_active Expired
Also Published As
Publication number | Publication date |
---|---|
GB487566A (en) | 1938-06-22 |
US2153044A (en) | 1939-04-04 |
CH200196A (en) | 1938-09-30 |
DK55033C (en) | 1938-08-01 |
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