GB855997A - Improvements in or relating to electric control circuits - Google Patents
Improvements in or relating to electric control circuitsInfo
- Publication number
- GB855997A GB855997A GB40337/57A GB4033757A GB855997A GB 855997 A GB855997 A GB 855997A GB 40337/57 A GB40337/57 A GB 40337/57A GB 4033757 A GB4033757 A GB 4033757A GB 855997 A GB855997 A GB 855997A
- Authority
- GB
- United Kingdom
- Prior art keywords
- bias
- amplifier
- rectifiers
- input
- shunt
- 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
- H04B3/04—Control of transmission; Equalising
Landscapes
- Engineering & Computer Science (AREA)
- Computer Networks & Wireless Communication (AREA)
- Signal Processing (AREA)
- Tone Control, Compression And Expansion, Limiting Amplitude (AREA)
Abstract
855,997. Automatic volume control. SVENSKA RELAFABRIKEN A.B. Dec. 30, 1957 [Oct. 31, 1957], No. 40337/57. Class 40 (4). A variable attenuation network comprises shunt non-linear resistances controlled from a bias source having two variable D.C. voltages of opposite sign superimposed thereon. The arrangement is used to condition a two-way amplifier in accordance with the amplitude and directions of speech currents received by it. As shown, terminals a, b and c, d are connected across the inputs to stages of amplifiers amplifying signals travelling in opposite directions. Thus the rectifiers D9, D10 and condensers C13, C14 constitute a shunt across the inputs of one of the stages. Rectifiers D9, D10 are normally partially conducting due to bias over resistors R13, R17. When the input to transformer T1 exceeds the bias, applied over resistors R12, R15, to rectifier D5 the condenser C10 charges with such a polarity as to decrease the D.C. through rectifiers D9, D10, thereby decreasing the shunt effect on the amplifier. Likewise a signal exceeding the bias on D3 charges C11 to increase the D.C. through D9, D10 and thereby increase the shunting effect. The upper controlling network operates in a similar manner. The latter is associated with the amplifier output which provides the input for T2. The lower network is associated with the amplifier whose output provides the input for T1. Thus the gains of the amplifiers in the two directions are arranged that when one rises the other falls, thereby preventing singing.
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| SE855997X | 1957-10-31 |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| GB855997A true GB855997A (en) | 1960-12-14 |
Family
ID=20362822
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| GB40337/57A Expired GB855997A (en) | 1957-10-31 | 1957-12-30 | Improvements in or relating to electric control circuits |
Country Status (1)
| Country | Link |
|---|---|
| GB (1) | GB855997A (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP0004054A1 (en) * | 1978-03-10 | 1979-09-19 | Siemens Aktiengesellschaft | Circuit for automatically equalizing a signal |
-
1957
- 1957-12-30 GB GB40337/57A patent/GB855997A/en not_active Expired
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP0004054A1 (en) * | 1978-03-10 | 1979-09-19 | Siemens Aktiengesellschaft | Circuit for automatically equalizing a signal |
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