GB360517A - An improved microphone for deaf people - Google Patents
An improved microphone for deaf peopleInfo
- Publication number
- GB360517A GB360517A GB24599/30A GB2459930A GB360517A GB 360517 A GB360517 A GB 360517A GB 24599/30 A GB24599/30 A GB 24599/30A GB 2459930 A GB2459930 A GB 2459930A GB 360517 A GB360517 A GB 360517A
- Authority
- GB
- United Kingdom
- Prior art keywords
- carbon
- casing
- diaphragm
- electrodes
- depressions
- 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
- H04R21/00—Variable-resistance transducers
- H04R21/02—Microphones
- H04R21/023—Microphones with more than one granular chamber
Landscapes
- Physics & Mathematics (AREA)
- Engineering & Computer Science (AREA)
- Acoustics & Sound (AREA)
- Signal Processing (AREA)
- Electrostatic, Electromagnetic, Magneto- Strictive, And Variable-Resistance Transducers (AREA)
- Diaphragms For Electromechanical Transducers (AREA)
Abstract
360,517. Microphones for deaf persons. SIEMENS & HALSKE AKT.-GES., Siemensstadt, Berlin. Aug. 16, 1930, No. 24599. Convention date, Aug. 17, 1929. [Class 40 (iv).] A carbon granular microphone for the d e a f comprises two or more separate rear r electrodes, preferably connected in series, and a common rectangular diaphragm vibrating freely as a single diaphragm and forming or carrying the front electrode. As shown, a rectangular casing 1 contains two carbon electrodes 2, 3 having depressions 4, 5 containing carbon granules 6. A carbon diaphragm 8 is glued to the turned up edge 7 of the casing which is closed by a perforated cover 9 thicker in the centre than at the edges. If desired, the diaphragm may be of nonconducting material and provided with a carbon coating or have a thin strip of carbon stuck thereon and each of the depressions 4, 5 is preferably filled with grains of different kinds or sizes. Two contact pins 10, one of which is shown in the Figure, are arranged on the narrow side of the casing and electrically connected with the electrodes, the back of the casing being provided with a clip 11 for attachment to the clothing. When make-andbreak switches are provided, these are inserted within the casing 1 so that only the operating knobs project therefrom.
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| DE360517X | 1929-08-17 |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| GB360517A true GB360517A (en) | 1931-11-12 |
Family
ID=6294386
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| GB24599/30A Expired GB360517A (en) | 1929-08-17 | 1930-08-16 | An improved microphone for deaf people |
Country Status (3)
| Country | Link |
|---|---|
| US (1) | US1944720A (en) |
| DE (1) | DE616935C (en) |
| GB (1) | GB360517A (en) |
-
0
- DE DENDAT616935D patent/DE616935C/de active Active
-
1930
- 1930-08-15 US US475576A patent/US1944720A/en not_active Expired - Lifetime
- 1930-08-16 GB GB24599/30A patent/GB360517A/en not_active Expired
Also Published As
| Publication number | Publication date |
|---|---|
| US1944720A (en) | 1934-01-23 |
| DE616935C (en) |
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