GB421706A - Improvements in telephone systems - Google Patents
Improvements in telephone systemsInfo
- Publication number
- GB421706A GB421706A GB10029/34A GB1002934A GB421706A GB 421706 A GB421706 A GB 421706A GB 10029/34 A GB10029/34 A GB 10029/34A GB 1002934 A GB1002934 A GB 1002934A GB 421706 A GB421706 A GB 421706A
- Authority
- GB
- United Kingdom
- Prior art keywords
- winding
- transmitter
- receiver
- tone
- currents
- 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
- 238000004804 winding Methods 0.000 abstract 4
- 230000004048 modification Effects 0.000 abstract 2
- 238000012986 modification Methods 0.000 abstract 2
- 238000010079 rubber tapping Methods 0.000 abstract 1
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)
- Cable Transmission Systems, Equalization Of Radio And Reduction Of Echo (AREA)
- Coils Or Transformers For Communication (AREA)
- Charge And Discharge Circuits For Batteries Or The Like (AREA)
Abstract
421,706. Anti - side - tone circuits. LOWE, J. P., 7, Montpelier, Edinburgh. Oct. 2, 1933, No. 10029/34. Divided out of 408,264. [Class 40 (iv)] An anti-side-tone circuit comprises two transformers one of which has a line winding, the transmitter and receiver being connected in two local circuits, each of which includes a winding on each of the transformers. As shown in Fig. 4, currents produced in the transmitter circuit B, C, T, CT induce currents in winding A which are sent to line but induce opposing currents in the receiver circuit R, D, E, the degree of balance being adjustable by means of a tapped network r. Modifications of this system are shown in which the receiver is in parallel instead of in series with the coils D, E, in which the transmitter is fed from a local battery and in which the system is applied to an operator's set. In a further modification, Fig. 6, the degree of side tone reduction is adjusted by means of tapping points on winding E.
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| GB1983477X | 1932-09-30 |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| GB421706A true GB421706A (en) | 1934-12-28 |
Family
ID=10895278
Family Applications (2)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| GB27171/32A Expired GB408264A (en) | 1932-09-30 | 1932-09-30 | Improvements in telephone systems |
| GB10029/34A Expired GB421706A (en) | 1932-09-30 | 1933-10-02 | Improvements in telephone systems |
Family Applications Before (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| GB27171/32A Expired GB408264A (en) | 1932-09-30 | 1932-09-30 | Improvements in telephone systems |
Country Status (2)
| Country | Link |
|---|---|
| US (1) | US1983477A (en) |
| GB (2) | GB408264A (en) |
Families Citing this family (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US2417067A (en) * | 1947-03-11 | Telephone substation circuit | ||
| US2574887A (en) * | 1949-04-30 | 1951-11-13 | Automatic Elect Lab | Substation circuit having manual control of receiving and transmitting efficiency |
-
1932
- 1932-09-30 GB GB27171/32A patent/GB408264A/en not_active Expired
-
1933
- 1933-09-25 US US690899A patent/US1983477A/en not_active Expired - Lifetime
- 1933-10-02 GB GB10029/34A patent/GB421706A/en not_active Expired
Also Published As
| Publication number | Publication date |
|---|---|
| US1983477A (en) | 1934-12-04 |
| GB408264A (en) | 1934-04-03 |
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