GB1333887A - Separation of television signals - Google Patents

Separation of television signals

Info

Publication number
GB1333887A
GB1333887A GB4095972A GB1333887DA GB1333887A GB 1333887 A GB1333887 A GB 1333887A GB 4095972 A GB4095972 A GB 4095972A GB 1333887D A GB1333887D A GB 1333887DA GB 1333887 A GB1333887 A GB 1333887A
Authority
GB
United Kingdom
Prior art keywords
signal
delay
line
colour
subcarrier
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
Application number
GB4095972A
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Pye Electronic Products Ltd
Original Assignee
Pye Ltd
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed by Pye Ltd filed Critical Pye Ltd
Publication of GB1333887A publication Critical patent/GB1333887A/en
Expired legal-status Critical Current

Links

Classifications

    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
    • H04N9/00—Details of colour television systems
    • H04N9/77—Circuits for processing the brightness signal and the chrominance signal relative to each other, e.g. adjusting the phase of the brightness signal relative to the colour signal, correcting differential gain or differential phase
    • H04N9/78—Circuits for processing the brightness signal and the chrominance signal relative to each other, e.g. adjusting the phase of the brightness signal relative to the colour signal, correcting differential gain or differential phase for separating the brightness signal or the chrominance signal from the colour television signal, e.g. using comb filter
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
    • H04N11/00—Colour television systems
    • H04N11/06—Transmission systems characterised by the manner in which the individual colour picture signal components are combined
    • H04N11/12—Transmission systems characterised by the manner in which the individual colour picture signal components are combined using simultaneous signals only
    • H04N11/14—Transmission systems characterised by the manner in which the individual colour picture signal components are combined using simultaneous signals only in which one signal, modulated in phase and amplitude, conveys colour information and a second signal conveys brightness information, e.g. NTSC-system
    • H04N11/16—Transmission systems characterised by the manner in which the individual colour picture signal components are combined using simultaneous signals only in which one signal, modulated in phase and amplitude, conveys colour information and a second signal conveys brightness information, e.g. NTSC-system the chrominance signal alternating in phase, e.g. PAL-system
    • H04N11/165—Decoding means therefor

Abstract

1333887 Colour television PYE Ltd 4 Sept 1972 40959/72 Heading H4F The quadrature modulated subcarrier chroma signals U and V are separated while maintaining their quadrature relationship from a PAL colour signal with quarter line offset by means of a comb filter in which the signal is delayed by one and two line periods, and a delay line having a delay of one quarter of the colour subcarrier period. As shown a PAL signal at input 1 is fed via a filter 2, which passes the chroma signal and the high frequency components of the luminance signal Y, directly and via one line period delays 4 and 8 to a summation circuit 5, directly to a difference circuit 11, and via one line period delay 4 to a difference circuit 14. The output from summation circuit 5 comprises 2Y and this is reduced to Y by potential divider 10 and passed to difference circuits 11 and 14. The outputs from difference circuits 11 and 14 are added 18 and subtracted 20 directly and via a delay 21 of one quarter of the colour subcarrier period to derive the U and V chroma subcarrier signals with their quadrature relationship which are demodulated in synchronous demodulators 26 and 27 to obtain the chrominance signals (B-Y) and Π(R-Y).
GB4095972A 1972-09-04 1972-09-04 Separation of television signals Expired GB1333887A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
GB4095972 1972-09-04

Publications (1)

Publication Number Publication Date
GB1333887A true GB1333887A (en) 1973-10-17

Family

ID=10417453

Family Applications (1)

Application Number Title Priority Date Filing Date
GB4095972A Expired GB1333887A (en) 1972-09-04 1972-09-04 Separation of television signals

Country Status (3)

Country Link
AU (1) AU477329B2 (en)
GB (1) GB1333887A (en)
ZA (1) ZA735274B (en)

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4136358A (en) * 1976-08-09 1979-01-23 Rca Corporation Transcoding apparatus
EP0033606A1 (en) * 1980-01-30 1981-08-12 Sony Corporation Methods of and decoders for decoding composite PAL television signals
US4345268A (en) * 1978-03-29 1982-08-17 British Broadcasting Corporation Processing circuit for color television signals
US4409612A (en) * 1980-09-20 1983-10-11 U.S. Philips Corporation Circuit arrangement for separating the components of a PAL color television signal
GB2153624A (en) * 1984-01-27 1985-08-21 Mcmichael Ltd Signal processing circuit for pal colour television signals

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4136358A (en) * 1976-08-09 1979-01-23 Rca Corporation Transcoding apparatus
US4345268A (en) * 1978-03-29 1982-08-17 British Broadcasting Corporation Processing circuit for color television signals
EP0033606A1 (en) * 1980-01-30 1981-08-12 Sony Corporation Methods of and decoders for decoding composite PAL television signals
US4409612A (en) * 1980-09-20 1983-10-11 U.S. Philips Corporation Circuit arrangement for separating the components of a PAL color television signal
GB2153624A (en) * 1984-01-27 1985-08-21 Mcmichael Ltd Signal processing circuit for pal colour television signals

Also Published As

Publication number Publication date
AU477329B2 (en) 1976-10-21
ZA735274B (en) 1974-07-31
AU5981473A (en) 1975-03-06

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Legal Events

Date Code Title Description
PS Patent sealed
732 Registration of transactions, instruments or events in the register (sect. 32/1977)
PCNP Patent ceased through non-payment of renewal fee