GB535753A - Improvements in audiphones - Google Patents
Improvements in audiphonesInfo
- Publication number
- GB535753A GB535753A GB9004/40A GB900440A GB535753A GB 535753 A GB535753 A GB 535753A GB 9004/40 A GB9004/40 A GB 9004/40A GB 900440 A GB900440 A GB 900440A GB 535753 A GB535753 A GB 535753A
- Authority
- GB
- United Kingdom
- Prior art keywords
- amplifier
- choke
- microphone
- condenser
- series circuit
- 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
- H04R25/00—Deaf-aid sets, i.e. electro-acoustic or electro-mechanical hearing aids; Electric tinnitus maskers providing an auditory perception
- H04R25/50—Customised settings for obtaining desired overall acoustical characteristics
- H04R25/502—Customised settings for obtaining desired overall acoustical characteristics using analog signal processing
Landscapes
- Health & Medical Sciences (AREA)
- General Health & Medical Sciences (AREA)
- Neurosurgery (AREA)
- Otolaryngology (AREA)
- Physics & Mathematics (AREA)
- Engineering & Computer Science (AREA)
- Acoustics & Sound (AREA)
- Signal Processing (AREA)
- Amplifiers (AREA)
Abstract
535,753. Hearing aids for the deaf. ELECTRICAL RESEARCH PRODUCTS, Inc. May 21, 1940, No. 9004. Convention date, June 20, 1939. [Class 40 (iv)] In a portable set for deaf persons, the pick-up microphone 12, the input and output units 14, 15 of a microphone amplifier, the receiver 16 and a single battery are connected in a series circuit, a large condenser being connected between the common point of the amplifier units and a point between the instruments 12, 16, or two large condensers 21, 22 being connected as shown to the common point and to opposite sides of a choke 23 in the series circuit to prevent retroaction. Volume is controlled by a rheostat 11. In a modification, Fig. 3 (not shown), flow of direct, current through the input unit of the amplifier is prevented by means of a series condenser and a byepassing choke.
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| US535753XA | 1939-06-20 | 1939-06-20 |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| GB535753A true GB535753A (en) | 1941-04-21 |
Family
ID=21985195
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| GB9004/40A Expired GB535753A (en) | 1939-06-20 | 1940-05-21 | Improvements in audiphones |
Country Status (3)
| Country | Link |
|---|---|
| BE (1) | BE469534A (en) |
| FR (1) | FR865911A (en) |
| GB (1) | GB535753A (en) |
-
0
- BE BE469534D patent/BE469534A/xx unknown
-
1940
- 1940-05-21 GB GB9004/40A patent/GB535753A/en not_active Expired
- 1940-05-31 FR FR865911D patent/FR865911A/en not_active Expired
Also Published As
| Publication number | Publication date |
|---|---|
| BE469534A (en) | |
| FR865911A (en) | 1941-06-09 |
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