GB1141471A - A circuit arrangement for minimising divergences from a predetermined value in the amplitude of an electrical signal - Google Patents
A circuit arrangement for minimising divergences from a predetermined value in the amplitude of an electrical signalInfo
- Publication number
- GB1141471A GB1141471A GB2249566A GB2249566A GB1141471A GB 1141471 A GB1141471 A GB 1141471A GB 2249566 A GB2249566 A GB 2249566A GB 2249566 A GB2249566 A GB 2249566A GB 1141471 A GB1141471 A GB 1141471A
- Authority
- GB
- United Kingdom
- Prior art keywords
- amplitude
- gain
- capacitor
- transistor
- constant
- 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
- 239000003990 capacitor Substances 0.000 abstract 3
- 238000013016 damping Methods 0.000 abstract 2
Classifications
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
- H04N5/00—Details of television systems
- H04N5/44—Receiver circuitry for the reception of television signals according to analogue transmission standards
- H04N5/52—Automatic gain control
- H04N5/53—Keyed automatic gain control
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
- H04N5/00—Details of television systems
- H04N5/14—Picture signal circuitry for video frequency region
- H04N5/16—Circuitry for reinsertion of dc and slowly varying components of signal; Circuitry for preservation of black or white level
- H04N5/18—Circuitry for reinsertion of dc and slowly varying components of signal; Circuitry for preservation of black or white level by means of "clamp" circuit operated by switching circuit
- H04N5/185—Circuitry for reinsertion of dc and slowly varying components of signal; Circuitry for preservation of black or white level by means of "clamp" circuit operated by switching circuit for the black level
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
- H04N5/00—Details of television systems
- H04N5/14—Picture signal circuitry for video frequency region
- H04N5/20—Circuitry for controlling amplitude response
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
- H04N5/00—Details of television systems
- H04N5/44—Receiver circuitry for the reception of television signals according to analogue transmission standards
- H04N5/52—Automatic gain control
Landscapes
- Engineering & Computer Science (AREA)
- Multimedia (AREA)
- Signal Processing (AREA)
- Picture Signal Circuits (AREA)
- Networks Using Active Elements (AREA)
Abstract
1,141,471. Transistor gain control circuits. FERNSEH G.m.b.H. 20 May, 1966 [22 May, 1965; 13 Dec., 1965; 26 March, 1966]. No. 22495/66. Heading H3T. A circuit arrangement for minimizing divergences from a predetermined value in the amplitude of an electrical signal comprises means for developing a control voltage related to the amplitude of a selected component only of said signal and for applying said control voltage to vary the gain of an amplifier, included in the path of said signal, by way of a control channel of which the effective timeconstant is determined by a first damping element when said divergence in either sense is large, and when said divergence is small is determined by the series combination of said first and a second damping element. In an embodiment the rectified gain control voltage is applied to terminal 8 and smoothed by a short time-constant circuit 11, 12; it is then passed to the bases of a pair of transistors 15, 16 of opposite conductivity type the emitters of which are connected in parallel and to capacitor 17. The voltage across capacitor 17 is supplied to the gain-controlled element in the signal path via emitter follower 18. For control signals deviations in either direction from the normal value and of large enough amplitude either transistor 15 or transistor 16 is conductive and the time-constant is that of R.C. circuit 11, 12; below a predetermined level, however, transistors 15, 16 are non-conductive and of high output impedance, determining with capacitor 17 the time-constant.
Applications Claiming Priority (3)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| DE1965F0046124 DE1242674B (en) | 1965-05-22 | 1965-05-22 | Circuit arrangement for obtaining a control voltage from a television signal |
| DEF0047904 | 1965-12-13 | ||
| DEF0048786 | 1966-03-26 |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| GB1141471A true GB1141471A (en) | 1969-01-29 |
Family
ID=27210426
Family Applications (2)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| GB3275968A Expired GB1145969A (en) | 1965-05-22 | 1966-05-20 | A circuit arrangement for minimising divergences from a predetermined value in the amplitude of an electrical signal |
| GB2249566A Expired GB1141471A (en) | 1965-05-22 | 1966-05-20 | A circuit arrangement for minimising divergences from a predetermined value in the amplitude of an electrical signal |
Family Applications Before (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| GB3275968A Expired GB1145969A (en) | 1965-05-22 | 1966-05-20 | A circuit arrangement for minimising divergences from a predetermined value in the amplitude of an electrical signal |
Country Status (2)
| Country | Link |
|---|---|
| GB (2) | GB1145969A (en) |
| NL (1) | NL6606964A (en) |
-
1966
- 1966-05-20 GB GB3275968A patent/GB1145969A/en not_active Expired
- 1966-05-20 GB GB2249566A patent/GB1141471A/en not_active Expired
- 1966-05-20 NL NL6606964A patent/NL6606964A/xx unknown
Also Published As
| Publication number | Publication date |
|---|---|
| NL6606964A (en) | 1966-11-23 |
| GB1145969A (en) | 1969-03-19 |
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