GB929232A - Improvements in or relating to automatic frequency control systems for television receivers - Google Patents
Improvements in or relating to automatic frequency control systems for television receiversInfo
- Publication number
- GB929232A GB929232A GB23707/59A GB2370759A GB929232A GB 929232 A GB929232 A GB 929232A GB 23707/59 A GB23707/59 A GB 23707/59A GB 2370759 A GB2370759 A GB 2370759A GB 929232 A GB929232 A GB 929232A
- Authority
- GB
- United Kingdom
- Prior art keywords
- output
- frequency
- sync
- discriminator
- frequency control
- 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
- H04N5/60—Receiver circuitry for the reception of television signals according to analogue transmission standards for the sound signals
- H04N5/62—Intercarrier circuits, i.e. heterodyning sound and vision carriers
-
- 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
- H04N5/50—Tuning indicators; Automatic tuning control
Landscapes
- Engineering & Computer Science (AREA)
- Multimedia (AREA)
- Signal Processing (AREA)
- Television Receiver Circuits (AREA)
- Superheterodyne Receivers (AREA)
Abstract
929,232. Automatic frequency control systems. BLAUPUNKT-WERKE G.m.b.H. July 10, 1959 [July 12, 1958], No. 23707/59. Class 40 (5). In a single sideband television receiver, with the nominal video carrier on one sloping flank of the receiver I.F. pass-band, an additional voltage derived from detected synchronizing pulses is added on to the output of a frequency discriminator tuned to the video carrier for A.F.C. of the local oscillator. Thereby the frequency control range is increased and ambiguities due to more than one zero of the discriminator output avoided. (The rectified sync. pulse amplitude is also dependent on frequency drift.) An additional step-wave voltage arising only when a certain frequency drift is exceeded may be derived from a phase discriminator 58 with inputs 56, 57 receiving sync. pulses from a sync separator stage and sweep voltages from a line output stage respectively and with one output 59 stabilizing a flywheel sync. oscillator controlling the line scan, the other output at 69 being added to a constant positive D.C. voltage and the output of a frequency discriminator 5 tuned to the video nominal I.F. frequency, and the combined output applied to a phase splitter 6 with outputs applied across a rectifier 61 constituting a variable capacitance in the tuned circuit of a local oscillator 60.
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| DEB49601A DE1220471B (en) | 1958-07-12 | 1958-07-12 | Retuning arrangement for a television receiver operating according to the differential carrier method |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| GB929232A true GB929232A (en) | 1963-06-19 |
Family
ID=6968924
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| GB23707/59A Expired GB929232A (en) | 1958-07-12 | 1959-07-10 | Improvements in or relating to automatic frequency control systems for television receivers |
Country Status (3)
| Country | Link |
|---|---|
| CH (1) | CH370825A (en) |
| DE (1) | DE1220471B (en) |
| GB (1) | GB929232A (en) |
Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE2162367C3 (en) * | 1971-12-16 | 1983-01-05 | Blaupunkt-Werke Gmbh, 3200 Hildesheim | Circuit arrangement for automatic, electronic sharpening in a television receiver |
Family Cites Families (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE739068C (en) * | 1938-09-19 | 1943-09-10 | Telefunken Gmbh | Device for automatic sharpening of a receiver |
| US2504663A (en) * | 1947-11-12 | 1950-04-18 | Gen Electric | Automatic frequency control for television receivers |
| DE1765032U (en) * | 1958-03-01 | 1958-04-17 | Max Grundig | AUTOMATIC VOTING FOR TELEVISION RECEIVERS. |
-
1958
- 1958-07-12 DE DEB49601A patent/DE1220471B/en active Pending
-
1959
- 1959-03-03 CH CH7029359A patent/CH370825A/en unknown
- 1959-07-10 GB GB23707/59A patent/GB929232A/en not_active Expired
Also Published As
| Publication number | Publication date |
|---|---|
| CH370825A (en) | 1963-07-31 |
| DE1220471B (en) | 1966-07-07 |
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