GB963262A - Improvements in or relating to television receiver line oscillators having automatic frequency control means - Google Patents
Improvements in or relating to television receiver line oscillators having automatic frequency control meansInfo
- Publication number
- GB963262A GB963262A GB3703760A GB3703760A GB963262A GB 963262 A GB963262 A GB 963262A GB 3703760 A GB3703760 A GB 3703760A GB 3703760 A GB3703760 A GB 3703760A GB 963262 A GB963262 A GB 963262A
- Authority
- GB
- United Kingdom
- Prior art keywords
- line
- stage
- oscillator
- phase
- output
- 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
- H04N5/126—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
Landscapes
- Engineering & Computer Science (AREA)
- Multimedia (AREA)
- Signal Processing (AREA)
- Synchronizing For Television (AREA)
- Details Of Television Scanning (AREA)
Abstract
963,262. Automatic frequency control. BLAUPUNKT-WERKE G.m.b.H. Oct. 28, 1960 [Oct. 30, 1959], No. 37037/60. Heading H3A. Relates to a television receiver in which the line oscillator 2 is synchronized by pulses from an A.F.C. stage 3 controlled through an R.C. filter network 7 by the output of a phase detector 9 which compares the phase of the line sync. pulses 17 from the sync. separator 15 with the output of the line oscillator or the line output stage 1. According to the invention, the time constant of the R.C. network 7 is short so that the A.F.C. stage has 8 range just sufficient to cover all likely frequency deviations. The negative direct voltage arising from grid rectification in oscillator 2 is also fed back over a resistor 23 to block the A.F.C. stage 3, for the major portion of each line scanning cycle, until the fractional alternating voltage of oscillator 2 fed back over capacity 22 has a positive value sufficient to cause unblocking. The capacitor 22 and resistor 5 shift the phase of this A.C. feedback and in other embodiments different phase shifters are used. The blocking of the A.F.C. stage prevents the introduction of interference impulses therethrough to the line oscillator for the said major part of each linescanning cycle.
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| DEB55343A DE1110214B (en) | 1959-10-30 | 1959-10-30 | Line oscillator for a television receiver with retuning arrangement |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| GB963262A true GB963262A (en) | 1964-07-08 |
Family
ID=6970958
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| GB3703760A Expired GB963262A (en) | 1959-10-30 | 1960-10-28 | Improvements in or relating to television receiver line oscillators having automatic frequency control means |
Country Status (2)
| Country | Link |
|---|---|
| DE (1) | DE1110214B (en) |
| GB (1) | GB963262A (en) |
-
1959
- 1959-10-30 DE DEB55343A patent/DE1110214B/en active Pending
-
1960
- 1960-10-28 GB GB3703760A patent/GB963262A/en not_active Expired
Also Published As
| Publication number | Publication date |
|---|---|
| DE1110214B (en) | 1961-07-06 |
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