GB789315A - Improvements in or relating to automatic synchronisation of time base circuit arrangements - Google Patents
Improvements in or relating to automatic synchronisation of time base circuit arrangementsInfo
- Publication number
- GB789315A GB789315A GB2377454A GB2377454A GB789315A GB 789315 A GB789315 A GB 789315A GB 2377454 A GB2377454 A GB 2377454A GB 2377454 A GB2377454 A GB 2377454A GB 789315 A GB789315 A GB 789315A
- Authority
- GB
- United Kingdom
- Prior art keywords
- frequency
- generator
- phase
- time base
- strobe
- 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
- 230000005540 biological transmission Effects 0.000 abstract 1
- 230000010363 phase shift Effects 0.000 abstract 1
- 238000010408 sweeping Methods 0.000 abstract 1
- 230000001360 synchronised effect Effects 0.000 abstract 1
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
- H04N5/126—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 indirectly commands a frequency generator
-
- H—ELECTRICITY
- H03—ELECTRONIC CIRCUITRY
- H03L—AUTOMATIC CONTROL, STARTING, SYNCHRONISATION OR STABILISATION OF GENERATORS OF ELECTRONIC OSCILLATIONS OR PULSES
- H03L7/00—Automatic control of frequency or phase; Synchronisation
- H03L7/06—Automatic control of frequency or phase; Synchronisation using a reference signal applied to a frequency- or phase-locked loop
- H03L7/08—Details of the phase-locked loop
- H03L7/10—Details of the phase-locked loop for assuring initial synchronisation or for broadening the capture range
- H03L7/12—Details of the phase-locked loop for assuring initial synchronisation or for broadening the capture range using a scanning signal
Landscapes
- Engineering & Computer Science (AREA)
- Multimedia (AREA)
- Signal Processing (AREA)
- Superheterodyne Receivers (AREA)
Abstract
789,315. Automatic frequency and phase control systems. MULLARD RADIO VALVE CO., Ltd. Nov. 15, 1955 [Aug. 16, 1954], No. 23774/54. Class 38 (4). A television receiver line time base generator 1 is retroactively stabilized in frequency and phase relative to synchronizing pulses by the amplified output of a phase discriminator 4 and the frequency of the generator is swept periodically over a range when not synchronized with the pulses to enlarge the catching range. The range may be so large that the frequency can lock on to different line frequencies of different transmission systems. As shown, the output of a coincidence gate 3 to which the generated signal and synchronizing pulses are applied controls the on or off condition of a strobe generator 2 causing a low-frequency search sweep of the generator 1. Alternatively the gate 3 and strobe 2 may be dispensed with and the output of the discriminator control a D.C. amplifier 5 back-coupled to act also as an oscillator, at low control voltages, for frequency sweeping the generator 1. Thus the back-coupled D.C. amplifier or strobe 2 may act also as a phase shift or Miller transitron oscillator. The generator 1 may be frequency varied through a resistance valve circuit or may be a grid-controlled multi-vibrator. The input to the phase discriminator 4 from the time base generator may be a harmonic of the frequency of the latter.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| GB2377454A GB789315A (en) | 1954-08-16 | 1954-08-16 | Improvements in or relating to automatic synchronisation of time base circuit arrangements |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| GB2377454A GB789315A (en) | 1954-08-16 | 1954-08-16 | Improvements in or relating to automatic synchronisation of time base circuit arrangements |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| GB789315A true GB789315A (en) | 1958-01-22 |
Family
ID=10201111
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| GB2377454A Expired GB789315A (en) | 1954-08-16 | 1954-08-16 | Improvements in or relating to automatic synchronisation of time base circuit arrangements |
Country Status (1)
| Country | Link |
|---|---|
| GB (1) | GB789315A (en) |
-
1954
- 1954-08-16 GB GB2377454A patent/GB789315A/en not_active Expired
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| US2594380A (en) | Synchronizing apparatus for color signal sampling oscillators | |
| GB1241562A (en) | Automatic tuning device | |
| GB856810A (en) | Improvements relating to television receivers | |
| GB788114A (en) | Improvements relating to frequency and phase control systems | |
| US2852669A (en) | Scanning receiver which ignores image signal and locks on desired signal | |
| GB1406898A (en) | Frequency comparator system | |
| GB1043772A (en) | Stabilized signal source | |
| GB664407A (en) | Television receiving apparatus | |
| GB789315A (en) | Improvements in or relating to automatic synchronisation of time base circuit arrangements | |
| GB1421093A (en) | Frequency discriminator circuit arrangement | |
| US2647994A (en) | Automatic frequency control in pulse transmission systems | |
| US2798946A (en) | Automatic frequency control system which stops hunting when in tune | |
| GB717887A (en) | Colour television | |
| GB1309339A (en) | Television receiver | |
| US2891154A (en) | Pulse demodulator | |
| ES372990A1 (en) | Phase discriminator for synchronizing a local oscillator | |
| US2801282A (en) | Oscillator synchronizing circuit | |
| US2656465A (en) | Synchronizing system | |
| GB1447504A (en) | Radar receivers | |
| GB760749A (en) | Phase controlled electric oscillators | |
| GB1098016A (en) | Improvements in or relating to circuit arrangements for synchronising relaxation oscillators | |
| GB775117A (en) | Improvements in or relating to television systems | |
| GB782878A (en) | Improvements in or relating to automatically controlled variable frequency oscillators | |
| GB802800A (en) | Improvements in or relating to coherent oscillator | |
| GB644579A (en) | Improvements in or relating to electrical timing systems |