GB1448979A - Circuit arrangements for colour television receivers - Google Patents
Circuit arrangements for colour television receiversInfo
- Publication number
- GB1448979A GB1448979A GB54773A GB54773A GB1448979A GB 1448979 A GB1448979 A GB 1448979A GB 54773 A GB54773 A GB 54773A GB 54773 A GB54773 A GB 54773A GB 1448979 A GB1448979 A GB 1448979A
- Authority
- GB
- United Kingdom
- Prior art keywords
- component
- demodulator
- oscillator
- phase
- bursts
- 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
1448979 Colour television EMI Ltd 14 Dec 1973 [4 Jan 1973] 547/73 Heading H4F A received PAL colour television signal is split into its U and V components by a one-line delay line (not shown) an adder (not shown) to derive the U component, a 180 degree phaseshifter 1 and an adder 2 to derive the V component, the V component being passed to a demodulator 9 via a switch 3 operated at the end of each line period, a direct path 6 and a 180 degree phase shifter 5 to derive a constantphase V<SP>1</SP> component; a reference oscillator 11 connected to demodulator 9 is synchronized by bursts derived either from a burst gate (12<SP>1</SP>, Fig. 2, not shown) connected to receive the V<SP>1</SP> component fed to demodulator 9, or from a burst gate 12, the bursts being passed via a switch 13 ganged with switch 3, direct path 15 and 180 degrees phase shifter 16, oscillator 11 operating at the mean phase of the received bursts, which is the phase of the V<SP>1</SP> component fed to demodulator 9. The U component is demodulated by a second demodulator (18, Fig. 2, not shown), the reference signal for which is derived either from a second oscillator (21) synchronized by the U components of the bursts, or from oscillator 11 if the phase of switch 3 relative to the received signal is monitored to generate a control signal which operates a phase shifting device inserted between the oscillator 11 and the U-demodulator.
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
GB54773A GB1448979A (en) | 1973-01-04 | 1973-01-04 | Circuit arrangements for colour television receivers |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
GB54773A GB1448979A (en) | 1973-01-04 | 1973-01-04 | Circuit arrangements for colour television receivers |
Publications (1)
Publication Number | Publication Date |
---|---|
GB1448979A true GB1448979A (en) | 1976-09-08 |
Family
ID=9706294
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
GB54773A Expired GB1448979A (en) | 1973-01-04 | 1973-01-04 | Circuit arrangements for colour television receivers |
Country Status (1)
Country | Link |
---|---|
GB (1) | GB1448979A (en) |
Cited By (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
EP0045221A2 (en) * | 1980-07-30 | 1982-02-03 | Matsushita Electric Industrial Co., Ltd. | Demodulator circuit for PAL system color television signals |
US4374396A (en) * | 1979-04-26 | 1983-02-15 | Robert Bosch Gmbh | Chrominance sub-carrier modifier for PAL-color television signals |
-
1973
- 1973-01-04 GB GB54773A patent/GB1448979A/en not_active Expired
Cited By (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US4374396A (en) * | 1979-04-26 | 1983-02-15 | Robert Bosch Gmbh | Chrominance sub-carrier modifier for PAL-color television signals |
EP0045221A2 (en) * | 1980-07-30 | 1982-02-03 | Matsushita Electric Industrial Co., Ltd. | Demodulator circuit for PAL system color television signals |
EP0045221A3 (en) * | 1980-07-30 | 1982-02-17 | Matsushita Electric Industrial Co., Ltd. | Demodulator circuit for color television signals of pal system |
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Legal Events
Date | Code | Title | Description |
---|---|---|---|
PS | Patent sealed | ||
746 | Register noted 'licences of right' (sect. 46/1977) | ||
PCNP | Patent ceased through non-payment of renewal fee | ||
732 | Registration of transactions, instruments or events in the register (sect. 32/1977) |