GB2018087A - Processing circuit for colour television signals - Google Patents

Processing circuit for colour television signals

Info

Publication number
GB2018087A
GB2018087A GB7909914A GB7909914A GB2018087A GB 2018087 A GB2018087 A GB 2018087A GB 7909914 A GB7909914 A GB 7909914A GB 7909914 A GB7909914 A GB 7909914A GB 2018087 A GB2018087 A GB 2018087A
Authority
GB
United Kingdom
Prior art keywords
output
signal
subtractor
line
input signal
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.)
Granted
Application number
GB7909914A
Other versions
GB2018087B (en
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.)
British Broadcasting Corp
Original Assignee
British Broadcasting Corp
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 British Broadcasting Corp filed Critical British Broadcasting Corp
Priority to GB7909914A priority Critical patent/GB2018087B/en
Publication of GB2018087A publication Critical patent/GB2018087A/en
Application granted granted Critical
Publication of GB2018087B publication Critical patent/GB2018087B/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

Landscapes

  • Engineering & Computer Science (AREA)
  • Multimedia (AREA)
  • Signal Processing (AREA)
  • Processing Of Color Television Signals (AREA)

Abstract

A signal processing circuit (10) for colour television signals, e.g. PAL signals, has first and second one-line delays (14, 16) connected in series to the input (12), an averager (18) connected across the two delays and a subtractor (20) connected to subtract the averager output from the output of the first delay (14). In this way the circuit provides (i) a first signal at the output of the first delay (14) which is the input signal delayed by one line period and (ii) a second signal at the output of the subtractor (20) which is the resultant of the average of the undelayed input signal and the input signal delayed by two line periods subtracted from the input signal. A band-pass filter (22) covering the chrominance band is connected to the output of the subtractor (20). A second subtractor (24) subtracts the filtered signal from the one-line delayed signal. Separated luminance and chrominance are obtained at the outputs of the second subtractor (24) and the filter (22) respectively, which are especially suitable for digital use with line-locked sampling frequencies. Either output may be used on its own. Not N.T.S.C. signals, a divide-by-two circuit is included in series with the band-pass filter (22). <IMAGE>
GB7909914A 1978-03-29 1979-03-21 Processing circuit for colour television signals Expired GB2018087B (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
GB7909914A GB2018087B (en) 1978-03-29 1979-03-21 Processing circuit for colour television signals

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
GB1229478 1978-03-29
GB7909914A GB2018087B (en) 1978-03-29 1979-03-21 Processing circuit for colour television signals

Publications (2)

Publication Number Publication Date
GB2018087A true GB2018087A (en) 1979-10-10
GB2018087B GB2018087B (en) 1982-10-27

Family

ID=26248918

Family Applications (1)

Application Number Title Priority Date Filing Date
GB7909914A Expired GB2018087B (en) 1978-03-29 1979-03-21 Processing circuit for colour television signals

Country Status (1)

Country Link
GB (1) GB2018087B (en)

Also Published As

Publication number Publication date
GB2018087B (en) 1982-10-27

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Legal Events

Date Code Title Description
PE20 Patent expired after termination of 20 years

Effective date: 19990320