GB781649A - Improvements in or relating to circuits for generating a d.c. voltage from recurrentpulses - Google Patents
Improvements in or relating to circuits for generating a d.c. voltage from recurrentpulsesInfo
- Publication number
- GB781649A GB781649A GB3294053A GB3294053A GB781649A GB 781649 A GB781649 A GB 781649A GB 3294053 A GB3294053 A GB 3294053A GB 3294053 A GB3294053 A GB 3294053A GB 781649 A GB781649 A GB 781649A
- Authority
- GB
- United Kingdom
- Prior art keywords
- pulses
- synch
- circuit
- limiter
- amplitude
- 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)
- Picture Signal Circuits (AREA)
- Tone Control, Compression And Expansion, Limiting Amplitude (AREA)
- Video Image Reproduction Devices For Color Tv Systems (AREA)
Abstract
781,649. Automatic gain control. ELECTRIC & MUSICAL INDUSTRIES, Ltd. Nov. 4, 1954 [Nov. 27, 1953], No. 32940/53. Class 40 (5). In a television A.G.C. circuit the demodulated video'signal (Fig. 2, not shown), is applied to a limiter 1 which removes the greater part of the video component and the resultant waveform is fed in such sense that the synch. pulses are positive-going, to an R.C. circuit 5, 6. The time-constant of the circuit 5, 6 is so chosen that there is produced across the resistance 6 a pair of pulses (Fig. 3, not shown), corresponding to each synch. pulse, the amplitude of each of which is substantially that of the synch. pulse and is independent of the slope of its sides. The negative-going pulses corresponding to the trailing edges of the synch. pulses are applied to a diode peak rectifier 10, the A.G.C. voltage being obtained across its load resistor 11. The limiting level may be varied in accordance with the signal amplitude by applying the A.G.C. bias to the limiter, via lead 14. In a modification, Fig. 4 (not shown), a further valve is interposed between the limiter and the R.C. circuit, being so biased as to pass only the tips of the synch. pulses. The circuit may alternatively be arranged so that the peak rectifier operates on the pulses corresponding to the leading edges of the synch. pulses, while the limiter may be omitted if the amplitude of the synch. pulses is appreciably greater than that of the rest of the signal. Specification 529,319, [Group XL], is referred to.
Priority Applications (3)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| GB3294053A GB781649A (en) | 1953-11-27 | 1953-11-27 | Improvements in or relating to circuits for generating a d.c. voltage from recurrentpulses |
| FR1118080D FR1118080A (en) | 1953-11-27 | 1954-11-18 | Improvements to circuits for measuring pulse amplitude |
| DEE9880A DE965907C (en) | 1953-11-27 | 1954-11-26 | Circuit arrangement for determining the amplitude of pulses |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| GB3294053A GB781649A (en) | 1953-11-27 | 1953-11-27 | Improvements in or relating to circuits for generating a d.c. voltage from recurrentpulses |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| GB781649A true GB781649A (en) | 1957-08-21 |
Family
ID=10346253
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| GB3294053A Expired GB781649A (en) | 1953-11-27 | 1953-11-27 | Improvements in or relating to circuits for generating a d.c. voltage from recurrentpulses |
Country Status (3)
| Country | Link |
|---|---|
| DE (1) | DE965907C (en) |
| FR (1) | FR1118080A (en) |
| GB (1) | GB781649A (en) |
Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| NL223074A (en) * | 1956-12-15 |
Family Cites Families (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US2214846A (en) * | 1938-06-21 | 1940-09-17 | Hazeltine Corp | Television automatic amplification control system |
-
1953
- 1953-11-27 GB GB3294053A patent/GB781649A/en not_active Expired
-
1954
- 1954-11-18 FR FR1118080D patent/FR1118080A/en not_active Expired
- 1954-11-26 DE DEE9880A patent/DE965907C/en not_active Expired
Also Published As
| Publication number | Publication date |
|---|---|
| FR1118080A (en) | 1956-05-31 |
| DE965907C (en) | 1957-06-27 |
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