GB712292A - Circuit arrangement for the generation of a control voltage for the automatic amplification control of television receivers - Google Patents
Circuit arrangement for the generation of a control voltage for the automatic amplification control of television receiversInfo
- Publication number
- GB712292A GB712292A GB5370/52A GB537052A GB712292A GB 712292 A GB712292 A GB 712292A GB 5370/52 A GB5370/52 A GB 5370/52A GB 537052 A GB537052 A GB 537052A GB 712292 A GB712292 A GB 712292A
- Authority
- GB
- United Kingdom
- Prior art keywords
- voltage
- signal
- condenser
- grid
- resistance
- 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
- 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)
- Control Of Amplification And Gain Control (AREA)
Abstract
712,292. Automatic gain control. STANDARD TELEPHONES & CABLES, Ltd. Feb. 29, 1952 [March 24, 1951], No. 5370/52. Class 40 (5) In a television receiver for signals of the negatively-modulated type an automatic gain control (A.G.C.) voltage is derived as the sum of two voltages, the first of which is proportional to the mean value of the rectified I.F. signal and the second to the difference between the peak and mean values of the rectified video-frequency signal. The signal detector 2 is direct-coupled to a video-frequency amplifier . 6 which modulates the cathode of the picture tub'e 8. A negative going voltage proportional to the mean value of the demodulated signal is obtained by means of a resistance-condenser combination 4, 5 and appears across the condenser 5. The signal applied to the cathode of the tube 8 is also applied to the grid of a synch-separator valve 11 via blocking condenser 9: the valve 11 operates by virtue of grid-leak bias, a series grid resistance 12 also being provided to improve the elimination of noise impulses. A voltage proportional to the difference between the peak and mean values of the composite video-frequency 'signal is obtained from the grid of the valve 11, by means of resistance-condenser combination 14, 5. This voltage appears across condenser 5, being added to the first component of A.G.C. voltage ; resistances 14, 4 provide a voltage divider whereby the correct proportion of the second component of A.G.C. voltage is added in. By deriving the A.G.C. voltage in this manner, the effect of noise impulses upon the control is minimized.
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| DE712292X | 1951-03-24 |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| GB712292A true GB712292A (en) | 1954-07-21 |
Family
ID=6621917
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| GB5370/52A Expired GB712292A (en) | 1951-03-24 | 1952-02-29 | Circuit arrangement for the generation of a control voltage for the automatic amplification control of television receivers |
Country Status (3)
| Country | Link |
|---|---|
| BE (1) | BE510161A (en) |
| FR (1) | FR1052706A (en) |
| GB (1) | GB712292A (en) |
-
0
- BE BE510161D patent/BE510161A/xx unknown
-
1952
- 1952-02-29 GB GB5370/52A patent/GB712292A/en not_active Expired
- 1952-03-21 FR FR1052706D patent/FR1052706A/en not_active Expired
Also Published As
| Publication number | Publication date |
|---|---|
| BE510161A (en) | |
| FR1052706A (en) | 1954-01-26 |
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