GB537944A - Improvements in or relating to signalling systems - Google Patents
Improvements in or relating to signalling systemsInfo
- Publication number
- GB537944A GB537944A GB9813/40A GB981340A GB537944A GB 537944 A GB537944 A GB 537944A GB 9813/40 A GB9813/40 A GB 9813/40A GB 981340 A GB981340 A GB 981340A GB 537944 A GB537944 A GB 537944A
- Authority
- GB
- United Kingdom
- Prior art keywords
- impulses
- amplifier
- determined
- gain
- circuit
- 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
- H04B—TRANSMISSION
- H04B3/00—Line transmission systems
- H04B3/02—Details
- H04B3/20—Reducing echo effects or singing; Opening or closing transmitting path; Conditioning for transmission in one direction or the other
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04B—TRANSMISSION
- H04B3/00—Line transmission systems
- H04B3/02—Details
- H04B3/04—Control of transmission; Equalising
- H04B3/06—Control of transmission; Equalising by the transmitted signal
Landscapes
- Engineering & Computer Science (AREA)
- Computer Networks & Wireless Communication (AREA)
- Signal Processing (AREA)
- Amplifiers (AREA)
- Emergency Protection Circuit Devices (AREA)
- Cable Transmission Systems, Equalization Of Radio And Reduction Of Echo (AREA)
Abstract
537,944. Automatic volume control in repeaters. ELECTRICAL RESEARCH PRODUCTS, Inc. June 5, 1940, No. 9813. Convention date, July 15, 1939. [Class 40 (iv)] A gain-increaser controlled by syllabic impulses is arranged to be operated only by the rising part of such impulses and comprises means for reducing the rate of gain-increase when the signals are above a pre-determined level. As shown, the gain of a transmission circuit is determined by the condition of a rectifier network 9 which is biased by means of the plate current of a push-pull pentode amplifier 7, 8 in the transmission path in co-operation with a circuit including a resistance 41 and the heater battery 33. The value of the plate current of the amplifier is governed by the voltage on a small condenser 27 shunted by a larger condenser 28 in series with resistances 29 ... 31 as described in U.S.A. Specification 2,156,622. A band of signal frequencies near 1200 cycles filtered from the input circuit, shorn of peaks by a discharge tube 83 and rectified by the diode portion of a diode-triode valve 49 produces syllablefrequency impulses in the anode circuit of the triode portion with the aid of resistance condenser circuits 54, 55 and 57 ... 60. These impulses pass through a transformer 68 associated with rectifiers 70, 71, arranged so that only the rising part of an impulse is effective, to a relay 61 which delivers impulses from a potentiometer 75, 76 to discharge condensers 27, 28 and so increase the plate current of amplifier 7, 8 and thus the impedance of the rectifier network. At a pre-determined input level the anode current of the triode portion of valve 49 is so reduced that a relay 66 falls back and reduces the effectiveness of the impulses delivered by 61 by cutting out parts of the potentiometer. When a pre-determined output level is reached, a three-electrode cold-cathode tube 36 breaks down and applies a negative bias to the amplifier 7, 8 to reduce the impedance of the rectifier network.
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| US284584A US2213034A (en) | 1939-07-15 | 1939-07-15 | Gain control circuits |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| GB537944A true GB537944A (en) | 1941-07-14 |
Family
ID=23090738
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| GB9813/40A Expired GB537944A (en) | 1939-07-15 | 1940-06-05 | Improvements in or relating to signalling systems |
Country Status (5)
| Country | Link |
|---|---|
| US (1) | US2213034A (en) |
| BE (1) | BE442895A (en) |
| FR (1) | FR866460A (en) |
| GB (1) | GB537944A (en) |
| NL (1) | NL63644C (en) |
Families Citing this family (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US2533253A (en) * | 1945-09-17 | 1950-12-12 | Royal V Howard | Automatic regulating system and peak limiter |
| US2713620A (en) * | 1949-04-29 | 1955-07-19 | Phillips Petroleum Co | Automatic volume control system |
-
0
- BE BE442895D patent/BE442895A/xx unknown
- NL NL63644D patent/NL63644C/xx active
-
1939
- 1939-07-15 US US284584A patent/US2213034A/en not_active Expired - Lifetime
-
1940
- 1940-06-05 GB GB9813/40A patent/GB537944A/en not_active Expired
- 1940-07-15 FR FR866460D patent/FR866460A/en not_active Expired
Also Published As
| Publication number | Publication date |
|---|---|
| NL63644C (en) | |
| US2213034A (en) | 1940-08-27 |
| BE442895A (en) | |
| FR866460A (en) | 1941-08-14 |
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