GB363512A - Improvements relating to telephone instrument circuits - Google Patents
Improvements relating to telephone instrument circuitsInfo
- Publication number
- GB363512A GB363512A GB3916130A GB3916130A GB363512A GB 363512 A GB363512 A GB 363512A GB 3916130 A GB3916130 A GB 3916130A GB 3916130 A GB3916130 A GB 3916130A GB 363512 A GB363512 A GB 363512A
- Authority
- GB
- United Kingdom
- Prior art keywords
- resistance
- antiside
- transformer
- tone
- circuits
- 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)
- Arrangements For Transmission Of Measured Signals (AREA)
- Cable Transmission Systems, Equalization Of Radio And Reduction Of Echo (AREA)
Abstract
363,512. Su.b-station antiside-tone circuits. SIEMENS BROS. & CO., Ltd., Caxton House, Tothill Street, and WIGAN, E. R., 18, Cambridge Road, Lee, both in London. Dec. 30, 1930, No. 39161. [Class 40 (iv).] In an antiside-tone circuit of the type described in Specification 263,211, [Class 40 (iv), Telephones &c.], in which a transformer is connected across the transmitter and receiver, a resistance is added to the receiver circuit, the value of the resistance being equivalent to the resistance component of the line impedance with which the instrument is designed to operate. As shown in the Figure, M is the antiside-tone transformer, Sl and P1 the induction coil secondary and primary respectively and X is the added resistance. This resistance may be a separate unit which may be mounted with the condenser C to form a three-terminal unit, may be obtained by winding the induction coil secondary with resistance alloy wire or may be mounted on the bobbin of the transformer M to make a fiveterminal unit. Circuits using the invention with automatic type instruments are shown in the Specification, and, when used with such instruments, the resistance may be connected to prevent the transient voltages produced during dialling from tinkling the calling bell.
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
GB3916130A GB363512A (en) | 1930-12-30 | 1930-12-30 | Improvements relating to telephone instrument circuits |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
GB3916130A GB363512A (en) | 1930-12-30 | 1930-12-30 | Improvements relating to telephone instrument circuits |
Publications (1)
Publication Number | Publication Date |
---|---|
GB363512A true GB363512A (en) | 1931-12-24 |
Family
ID=10408010
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
GB3916130A Expired GB363512A (en) | 1930-12-30 | 1930-12-30 | Improvements relating to telephone instrument circuits |
Country Status (1)
Country | Link |
---|---|
GB (1) | GB363512A (en) |
-
1930
- 1930-12-30 GB GB3916130A patent/GB363512A/en not_active Expired
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