GB778756A - Improvements in or relating to telephone subscribers' instruments - Google Patents
Improvements in or relating to telephone subscribers' instrumentsInfo
- Publication number
- GB778756A GB778756A GB29656A GB29656A GB778756A GB 778756 A GB778756 A GB 778756A GB 29656 A GB29656 A GB 29656A GB 29656 A GB29656 A GB 29656A GB 778756 A GB778756 A GB 778756A
- Authority
- GB
- United Kingdom
- Prior art keywords
- instruments
- relating
- telephone subscribers
- line
- resistor
- 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)
- Circuits Of Receivers In General (AREA)
Abstract
778,756. Substation anti-side-tone circuits. STANDARD TELEPHONES & CABLES, Ltd. Jan. 4, 1956, No. 296/56. Addition to 775,564 Class 40 (4). The circuit of the parent Specification is modified by the replacement of inductor L and capacitor C3 by resistors R10 and R11 respectively. An additional resistor R12 in the emitter circuit gives a negative feedback effect, and a line-holding resistor R13 is connected across the line terminals. A rectifier bridge W1 maintains the correct polarity of the D.C. supply to the transistor TR. Specification 694,021 also is referred to.
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
GB29656A GB778756A (en) | 1956-01-04 | 1956-01-04 | Improvements in or relating to telephone subscribers' instruments |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
GB29656A GB778756A (en) | 1956-01-04 | 1956-01-04 | Improvements in or relating to telephone subscribers' instruments |
Publications (1)
Publication Number | Publication Date |
---|---|
GB778756A true GB778756A (en) | 1957-07-10 |
Family
ID=9701877
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
GB29656A Expired GB778756A (en) | 1956-01-04 | 1956-01-04 | Improvements in or relating to telephone subscribers' instruments |
Country Status (1)
Country | Link |
---|---|
GB (1) | GB778756A (en) |
-
1956
- 1956-01-04 GB GB29656A patent/GB778756A/en not_active Expired
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