GB457215A - Improvements in or relating to telephone circuits - Google Patents
Improvements in or relating to telephone circuitsInfo
- Publication number
- GB457215A GB457215A GB22481/35A GB2248135A GB457215A GB 457215 A GB457215 A GB 457215A GB 22481/35 A GB22481/35 A GB 22481/35A GB 2248135 A GB2248135 A GB 2248135A GB 457215 A GB457215 A GB 457215A
- Authority
- GB
- United Kingdom
- Prior art keywords
- winding
- battery
- line
- transmitter
- series
- 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
- H04M—TELEPHONIC COMMUNICATION
- H04M1/00—Substation equipment, e.g. for use by subscribers
- H04M1/58—Anti-side-tone circuits
Landscapes
- Engineering & Computer Science (AREA)
- Signal Processing (AREA)
- Devices For Supply Of Signal Current (AREA)
- Soft Magnetic Materials (AREA)
Abstract
457,215. Anti - side - tone circuits. GENERAL ELECTRIC CO., Ltd., Magnet House, Kingsway, London, and JONES, A. F., c/o General Electric Co., Ltd., Stoke, Coventry. Aug. 9, 1935, No. 22481. [Class 40 (iv)] An anti-side-tone substation circuit includes a three-winding transformer having one winding C connected directly across the line wires, a second winding B in parallel or in series with the receiver R and a third winding A in series with the battery L forming a shunt across the transmitter T. A resistance Z acts as a line balance and regulates the anti-sidetone action, while a condenser K isolates the battery L from the line. Fig. 3 shows the position of the switch hook contacts H and the dial impulse and off-normal contacts M, N. The Provisional Specification describes a modified arrangement in which the transmitter T and battery L are shunted by the third winding A.
Priority Applications (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| GB22481/35A GB457215A (en) | 1935-08-09 | 1935-08-09 | Improvements in or relating to telephone circuits |
| US89917A US2190155A (en) | 1935-08-09 | 1936-07-10 | Telephone circuit |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| GB22481/35A GB457215A (en) | 1935-08-09 | 1935-08-09 | Improvements in or relating to telephone circuits |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| GB457215A true GB457215A (en) | 1936-11-24 |
Family
ID=10180088
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| GB22481/35A Expired GB457215A (en) | 1935-08-09 | 1935-08-09 | Improvements in or relating to telephone circuits |
Country Status (2)
| Country | Link |
|---|---|
| US (1) | US2190155A (en) |
| GB (1) | GB457215A (en) |
Families Citing this family (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US2548723A (en) * | 1945-07-13 | 1951-04-10 | Kellogg Switchboard & Supply | Telephone set hook-switch apparatus |
| US2848551A (en) * | 1955-05-31 | 1958-08-19 | Frank R Mallalieu | Direct call secrecy intercommunicating telephone equipment |
-
1935
- 1935-08-09 GB GB22481/35A patent/GB457215A/en not_active Expired
-
1936
- 1936-07-10 US US89917A patent/US2190155A/en not_active Expired - Lifetime
Also Published As
| Publication number | Publication date |
|---|---|
| US2190155A (en) | 1940-02-13 |
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