GB1265108A - - Google Patents
Info
- Publication number
- GB1265108A GB1265108A GB1265108DA GB1265108A GB 1265108 A GB1265108 A GB 1265108A GB 1265108D A GB1265108D A GB 1265108DA GB 1265108 A GB1265108 A GB 1265108A
- Authority
- GB
- United Kingdom
- Prior art keywords
- circuit
- gain
- control
- transistor
- control signal
- 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
- 230000002159 abnormal effect Effects 0.000 abstract 2
- 239000003990 capacitor Substances 0.000 abstract 2
- 230000001105 regulatory effect Effects 0.000 abstract 2
- 238000001514 detection method Methods 0.000 abstract 1
- 230000009977 dual effect Effects 0.000 abstract 1
- 238000009499 grossing Methods 0.000 abstract 1
- 230000003446 memory effect Effects 0.000 abstract 1
Classifications
-
- H—ELECTRICITY
- H03—ELECTRONIC CIRCUITRY
- H03G—CONTROL OF AMPLIFICATION
- H03G3/00—Gain control in amplifiers or frequency changers
- H03G3/005—Control by a pilot signal
-
- 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
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04B—TRANSMISSION
- H04B3/00—Line transmission systems
- H04B3/02—Details
- H04B3/04—Control of transmission; Equalising
- H04B3/10—Control of transmission; Equalising by pilot signal
Landscapes
- Engineering & Computer Science (AREA)
- Computer Networks & Wireless Communication (AREA)
- Signal Processing (AREA)
- Control Of Amplification And Gain Control (AREA)
Abstract
1,265,108. Automatic volume control. STANDARD TELEPHONES & CABLES Ltd. 24 Sept., 1970, No. 45424/70. Addition to 1,085,167. Heading H4R. In a gain regulating system of the type of Specification 1,085,167 which includes an arrangement for holding the gain at its normal value during abnormal variations in amplifier output, e.g. due to pilot signal failure, the gain control signal is fed to the regulating circuit via a circuit 18 including a transistor having a capacitor 3 connected between its input terminal and its output terminal to provide the memory action, The control circuit preferably includes a short time constant smoothing circuit including capacitor 27 which maintains the control signal value during the operate time of relay 28, which open circuits the feed to circuit 18 on detection of an abnormal variation in control signal. The transistor in the control circuit 18 may be a F.E.T. or a dual transistor, Fig. 2 (not shown). The circuit 18 may be enclosed in a hermetically sealed box filled with dry gas to reduce leakage currents. Control of the gain of the amplifier is effected by variation of the heater current in a thermistor.
Applications Claiming Priority (3)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| GB796764A GB997978A (en) | 1964-02-26 | 1964-02-26 | Amplifier regulation |
| GB2129966A GB1085167A (en) | 1966-05-13 | 1966-05-13 | Amplifier regulation |
| GB4542470 | 1970-09-24 |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| GB1265108A true GB1265108A (en) | 1972-03-01 |
Family
ID=27255091
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| GB1265108D Expired GB1265108A (en) | 1964-02-26 | 1970-09-24 |
Country Status (1)
| Country | Link |
|---|---|
| GB (1) | GB1265108A (en) |
-
1970
- 1970-09-24 GB GB1265108D patent/GB1265108A/en not_active Expired
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| GB815632A (en) | Improvements in or relating to communication systems | |
| GB1265108A (en) | ||
| GB1290520A (en) | ||
| GB1086155A (en) | Improvements in or relating to direct-voltage sources | |
| ES386344A1 (en) | Voltage reference circuit or voltage threshold detection circuit incorporating such a reference circuit | |
| GB1009271A (en) | Improvements in or relating to smoke detector circuits | |
| GB1106496A (en) | Time delay unit | |
| GB1085167A (en) | Amplifier regulation | |
| GB1205172A (en) | Circuit for reducing excitation currents for a rotating transformer | |
| GB1253256A (en) | ||
| ES323378A1 (en) | A provision of automatic gain control for receivers of radio signals. (Machine-translation by Google Translate, not legally binding) | |
| GB944002A (en) | Fault locating circuit arrangement | |
| ES266649A1 (en) | Improvements in tension stabilizers (Machine-translation by Google Translate, not legally binding) | |
| GB1041370A (en) | Improvements in or relating to electrical apparatuses | |
| GB1306748A (en) | Stand-by power supply circuit arrangements | |
| GB817417A (en) | Automatic gain control arrangements for transistor amplifiers | |
| GB1139708A (en) | Improvements in or relating to communication circuits including echo suppressors | |
| GB1192939A (en) | Peak Follower and Memory | |
| GB902430A (en) | Improvements in or relating to transistor amplifiers | |
| GB1313919A (en) | Image intensifier | |
| GB769815A (en) | Improvements in or relating to electrical power supplies | |
| CA592095A (en) | Relay control circuit for micro-wave power line relaying system | |
| GB946214A (en) | Improvements in or relating to electric power supply arrangements | |
| GB966598A (en) | Improvements in or relating to electric gating circuits | |
| GB1111931A (en) | Electrical circuits |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PS | Patent sealed | ||
| PCNP | Patent ceased through non-payment of renewal fee |