GB1342497A - Demodulating systems for colour television receivers - Google Patents
Demodulating systems for colour television receiversInfo
- Publication number
- GB1342497A GB1342497A GB998471A GB998471A GB1342497A GB 1342497 A GB1342497 A GB 1342497A GB 998471 A GB998471 A GB 998471A GB 998471 A GB998471 A GB 998471A GB 1342497 A GB1342497 A GB 1342497A
- Authority
- GB
- United Kingdom
- Prior art keywords
- phase
- oscillator
- demodulator
- colour
- 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
- H04N9/00—Details of colour television systems
- H04N9/44—Colour synchronisation
- H04N9/455—Generation of colour burst signals; Insertion of colour burst signals in colour picture signals or separation of colour burst signals from colour picture signals
Landscapes
- Engineering & Computer Science (AREA)
- Multimedia (AREA)
- Signal Processing (AREA)
- Processing Of Color Television Signals (AREA)
Abstract
1342497 Colour television SANYO ELECTRIC CO Ltd 19 April 1971 [15 March 1971] 9984/71 Heading H4F In a chrominance demodulation circuit a colour television signal is fed to a signal separator 3 and the PAL chrominance signal with swinging colour bursts is fed to parallel 0 and 180 degrees phase shifters 9, 8 which are alternately connected to a band-pass amplifier 4 via a switch 10 operated by pulses at line frequency. The bandpass amplifier 4 passes the PAL chrominance signal to the R-Y demodulator 5 and passes the colour bursts via a gate 6 to control the operation of an oscillator 16 via a phase detector 13. Regardless of the phase of operation of the switch 10 the R-Y component of the chrominance signal fed to the demodulator 5 is of the same polarity for every line and is the same polarity as the output of the oscillator 16. For the B-Y component of the chrominance signal there is provided a band pass amplifier 4<SP>1</SP>, gate 6<SP>1</SP>, oscillator 16<SP>1</SP> and demodulator 5<SP>1</SP>. In an alternative embodiment (Fig. 3, not shown) one band-pass amplifier and one gate are used instead of the two amplifiers 4, 4<SP>1</SP>, and two gates 6, 6<SP>1</SP>, the amplifier receiving the output from the signal separator, the separated colour bursts and chrominance signal being separately phase shifted by a respective pair of phase shifters and associated switch before being passed to the R-Y oscillator and R-Y demodulator respectively. In this case the two switches may be operated in antiphase, to give a -(R-Y) output from the R-Y demodulator. Alternatively (Fig. 4, not shown) the chrominance signal may be fed without phase-shift to both demodulators, the colour bursts being phaseshifted as before before being passed to the R-Y oscillator, the output from the R-Y oscillator also being phase shifted by a pair of phase shifters and a switch operated in phase or antiphase with the switch of the colour burst phase shifter, thus giving an output from the R-Y demodulator of + (R-Y) or -(R-Y) as desired.
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP1420571 | 1971-03-15 |
Publications (1)
Publication Number | Publication Date |
---|---|
GB1342497A true GB1342497A (en) | 1974-01-03 |
Family
ID=11854594
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
GB998471A Expired GB1342497A (en) | 1971-03-15 | 1971-04-19 | Demodulating systems for colour television receivers |
Country Status (2)
Country | Link |
---|---|
DE (1) | DE2118891A1 (en) |
GB (1) | GB1342497A (en) |
Families Citing this family (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
AU519140B2 (en) * | 1979-04-19 | 1981-11-12 | Matsushita Electric Industrial Co., Ltd. | Pal demodulator |
-
1971
- 1971-04-19 GB GB998471A patent/GB1342497A/en not_active Expired
- 1971-04-19 DE DE19712118891 patent/DE2118891A1/en active Pending
Also Published As
Publication number | Publication date |
---|---|
DE2118891A1 (en) | 1972-09-28 |
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Legal Events
Date | Code | Title | Description |
---|---|---|---|
PS | Patent sealed | ||
PCNP | Patent ceased through non-payment of renewal fee |