GB370369A - Improvements in apparatus for use by persons suffering from aural defects - Google Patents
Improvements in apparatus for use by persons suffering from aural defectsInfo
- Publication number
- GB370369A GB370369A GB29390/30A GB2939030A GB370369A GB 370369 A GB370369 A GB 370369A GB 29390/30 A GB29390/30 A GB 29390/30A GB 2939030 A GB2939030 A GB 2939030A GB 370369 A GB370369 A GB 370369A
- Authority
- GB
- United Kingdom
- Prior art keywords
- valve
- telephone
- defects
- shunted
- microphone
- 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
- H04R25/04—Deaf-aid sets, i.e. electro-acoustic or electro-mechanical hearing aids; Electric tinnitus maskers providing an auditory perception comprising pocket amplifiers
Abstract
370,369. Valve amplifying circuits. NAAMLOOZE VENNOOTSCHAP PHILIPS' GLOEILAMPENFABRIEKEN, 13D, Emmasingel, Eindhoven, Holland. Oct. 1, 1930, No. 29390. Convention date, Nov. 23, 1929. Void [Published under Sect. 91 of the Acts]. [Class 40 (v).] An amplifying telephone set for use by the partially deaf has a filter interposed in the circuit for emphasizing sounds in a certain range of frequency. As shown in Fig. 1, the input transformer 2 interposed between the microphone M and the first valve 3 has its secondary shunted by a condenser 8 to accentuate tones in the neighbourhood of the resonant frequency. The condenser 8 may be removable and interchangeable to suit varied defects in hearing. A rheostat 9 shunted across the transformer primary permits adjustment of the volume of sound heard in the telephone instrument T. The valve set may be housed in an envelope 11, Fig. 2, of suitable shape for the pocket, and with leads extending to the microphone 15, telephone 16, and battery 17.
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| NL370369X | 1929-11-23 |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| GB370369A true GB370369A (en) | 1932-04-07 |
Family
ID=19785537
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| GB29390/30A Expired GB370369A (en) | 1929-11-23 | 1930-10-01 | Improvements in apparatus for use by persons suffering from aural defects |
Country Status (2)
| Country | Link |
|---|---|
| FR (1) | FR703764A (en) |
| GB (1) | GB370369A (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4870688A (en) * | 1986-05-27 | 1989-09-26 | Barry Voroba | Mass production auditory canal hearing aid |
-
1930
- 1930-10-01 GB GB29390/30A patent/GB370369A/en not_active Expired
- 1930-10-16 FR FR703764D patent/FR703764A/en not_active Expired
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4870688A (en) * | 1986-05-27 | 1989-09-26 | Barry Voroba | Mass production auditory canal hearing aid |
| JP2655604B2 (en) | 1986-05-27 | 1997-09-24 | ボーシュ・アンド・ロム・ヒアリング・システムズ・ディヴィジョン・インコーポレーテッド | Mass production ear canal hearing aid |
Also Published As
| Publication number | Publication date |
|---|---|
| FR703764A (en) | 1931-05-06 |
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