GB1490725A - Demodulation circuit for colour television signals - Google Patents
Demodulation circuit for colour television signalsInfo
- Publication number
- GB1490725A GB1490725A GB4776074A GB4776074A GB1490725A GB 1490725 A GB1490725 A GB 1490725A GB 4776074 A GB4776074 A GB 4776074A GB 4776074 A GB4776074 A GB 4776074A GB 1490725 A GB1490725 A GB 1490725A
- Authority
- GB
- United Kingdom
- Prior art keywords
- phase
- switch
- phase comparator
- signal
- pal
- 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
- H04N9/00—Details of colour television systems
- H04N9/44—Colour synchronisation
- H04N9/465—Synchronisation of the PAL-switch
Landscapes
- Engineering & Computer Science (AREA)
- Multimedia (AREA)
- Signal Processing (AREA)
- Processing Of Color Television Signals (AREA)
Abstract
1490725 Colour television INDESIT INDUSTRIA ELETTRODOMESTICI ITALIANA SpA 5 Nov 1974 [7 Nov 1973] 47760/74 Heading H4F The phase of a PAL-switch 14 in a colour television receiver is controlled in response to the output of a phase comparator 11 receiving one input from a subcarrier regenerator 12 and the other input from a burst gate 6 via a switch 9 synchronized with PAL-switch 14 and a 90 degree phase delay 10. If switches 9 and 14, controlled by a multivibrator 8, are operating in the correct phase all the bursts received by phase comparator 11 are of a constant phase (+ 135 degrees relative to the B-Y axis) whereas if switches 9 and 14 are operating in the incorrect phase successive bursts received by phase comparator 11 are in antiphase (-135 degrees, + 45 degrees); in the latter situation phase comparator 11 provides a signal which alternates at half line frequency which signal passes through a half line frequency selective circuit 17 to a rectifier circuit 18 which provides a signal either to reset multivibrator 8 or to change a change-over switch connected to the output of multivibrator 8 to invert the control signal supplied to switches 9 and 14. The output of phase comparator 11 controls subcarrier regenerator 12 to supply a signal in phase with the bursts received by phase comparator 11, which is supplied via a 135 degree phase delay 13 to B-Y demodulator 3 and PAL-switch 14.
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| IT7026273A IT999737B (en) | 1973-11-07 | 1973-11-07 | DEMODULATOR CIRCUIT OF TELEVISION CHROMATIC SIGNALS |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| GB1490725A true GB1490725A (en) | 1977-11-02 |
Family
ID=11313691
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| GB4776074A Expired GB1490725A (en) | 1973-11-07 | 1974-11-05 | Demodulation circuit for colour television signals |
Country Status (2)
| Country | Link |
|---|---|
| GB (1) | GB1490725A (en) |
| IT (1) | IT999737B (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP0009237A1 (en) * | 1978-09-19 | 1980-04-02 | Sanyo Electric Co., Ltd. | Chrominance signal circuit in color television receiver |
| CZ309384B6 (en) * | 2017-01-26 | 2022-11-02 | České vysoké učení technické v Praze | Frequency selective circuit with constant phase |
-
1973
- 1973-11-07 IT IT7026273A patent/IT999737B/en active
-
1974
- 1974-11-05 GB GB4776074A patent/GB1490725A/en not_active Expired
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP0009237A1 (en) * | 1978-09-19 | 1980-04-02 | Sanyo Electric Co., Ltd. | Chrominance signal circuit in color television receiver |
| CZ309384B6 (en) * | 2017-01-26 | 2022-11-02 | České vysoké učení technické v Praze | Frequency selective circuit with constant phase |
Also Published As
| Publication number | Publication date |
|---|---|
| IT999737B (en) | 1976-03-10 |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PS | Patent sealed | ||
| PCNP | Patent ceased through non-payment of renewal fee |