GB936656A - Improvements relating to circuit arrangements for synchronising relaxation oscillators - Google Patents
Improvements relating to circuit arrangements for synchronising relaxation oscillatorsInfo
- Publication number
- GB936656A GB936656A GB4105759A GB4105759A GB936656A GB 936656 A GB936656 A GB 936656A GB 4105759 A GB4105759 A GB 4105759A GB 4105759 A GB4105759 A GB 4105759A GB 936656 A GB936656 A GB 936656A
- Authority
- GB
- United Kingdom
- Prior art keywords
- waveform
- relaxation
- oscillator
- saw
- dec
- 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
- H04N5/04—Synchronising
- H04N5/12—Devices in which the synchronising signals are only operative if a phase difference occurs between synchronising and synchronised scanning devices, e.g. flywheel synchronising
- H04N5/123—Devices in which the synchronising signals are only operative if a phase difference occurs between synchronising and synchronised scanning devices, e.g. flywheel synchronising whereby the synchronisation signal directly commands a frequency generator
Abstract
936,656. Pulse circuits. TELEFUNKEN G.m.b.H. Dec. 3, 1959 [Dec. 3, 1958], No. 41057/59. Class 40 (6). A relaxation oscillator having a saw-tooth relaxation characteristic 1 is synchronized by saw-tooth pulses 5, the slope of the forward flank of which is of opposite sign to that of the characteristic 1. The nominal natural frequency of the oscillator is such that the rear flank 6 intersects the relaxation line at the natural transition point. As shown, frame synchronizing pulses 9 for a a television receiver are obtained from the separator stage 8 via a multiple integrating circuit 7. The line synchronizing pulses 18 are removed by means of a biased diode 10. Waveform 9 drives valve 12 into grid current, charging capacitor 11 and cutting-off the anode current until capacitor 11 has discharged via resistor 15, giving waveform 19. Valve 12 passes anode current during the hatched portion of waveform 19 providing a negative going sawtooth waveform 21 at the anode which is used to synchronize a blocking oscillator or multi-vibrator type of time base generator 14. The relaxation waveform 1 of the oscillator 14 is shown in Fig. 2; the free-running frequency being adjusted so that the transition point 6, when free-running, coincides with the centre of the trailing edge of the synchronizing pulse 21.
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| DET0015950 | 1958-12-03 |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| GB936656A true GB936656A (en) | 1963-09-11 |
Family
ID=7548083
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| GB4105759A Expired GB936656A (en) | 1958-12-03 | 1959-12-03 | Improvements relating to circuit arrangements for synchronising relaxation oscillators |
Country Status (3)
| Country | Link |
|---|---|
| DE (1) | DE1074171B (en) |
| FR (1) | FR1246962A (en) |
| GB (1) | GB936656A (en) |
-
0
- DE DENDAT1074171D patent/DE1074171B/en active Pending
-
1959
- 1959-11-17 FR FR810339A patent/FR1246962A/en not_active Expired
- 1959-12-03 GB GB4105759A patent/GB936656A/en not_active Expired
Also Published As
| Publication number | Publication date |
|---|---|
| FR1246962A (en) | 1960-11-25 |
| DE1074171B (en) | 1960-01-28 |
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