GB2003695A - Transcoding digital PAL colour television signals - Google Patents

Transcoding digital PAL colour television signals

Info

Publication number
GB2003695A
GB2003695A GB7833561A GB7833561A GB2003695A GB 2003695 A GB2003695 A GB 2003695A GB 7833561 A GB7833561 A GB 7833561A GB 7833561 A GB7833561 A GB 7833561A GB 2003695 A GB2003695 A GB 2003695A
Authority
GB
United Kingdom
Prior art keywords
divided
signal
2fsc
chrominance
sampled
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
GB7833561A
Other versions
GB2003695B (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 GB7833561A priority Critical patent/GB2003695B/en
Publication of GB2003695A publication Critical patent/GB2003695A/en
Application granted granted Critical
Publication of GB2003695B publication Critical patent/GB2003695B/en
Expired legal-status Critical Current

Links

Classifications

    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
    • H04N11/00—Colour television systems
    • H04N11/04—Colour television systems using pulse code modulation
    • H04N11/042—Codec means
    • H04N11/048—Sub-Nyquist sampling

Abstract

In a method of and apparatus for processing PAL colour television signals in digital form, the signals are transcoded between (i) a 2fsc format consisting of an encoded signal of PAL type sampled at 2fsc and (ii) a 3fsc format consisting of a luminance signal Y sampled at 2fsc and a chrominance signal C sampled at fsc and comprising U + V and U - V on alternate lines (or either the luminance signal or composite chrominance signal by itself). Converting from the 2fsc to the 3fsc format, over the chrominance bandwidth (22) undelayed and 1- and 2-line delayed (14, 16) samples are combined in the proportions 1 DIVIDED 4:1 DIVIDED 2:1 DIVIDED 4, and below the chrominance band the 1-line delayed samples are low-pass filtered (24), these together providing the luminance signal Y. To provide the chrominance signal C the undelayed and 2-line delayed signals are combined (50) in the proportions - 1 DIVIDED 4:1 DIVIDED 4. The low- and band-pass filters (24, 22, 52) are digital transversal filters operating on adjacent samples in the signal. Transcoding in the other direction is similar. <IMAGE>
GB7833561A 1977-09-01 1978-08-16 Method and apparatus for processing pal colour television signals in digital form Expired GB2003695B (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
GB7833561A GB2003695B (en) 1977-09-01 1978-08-16 Method and apparatus for processing pal colour television signals in digital form

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
GB3659077 1977-09-01
GB7833561A GB2003695B (en) 1977-09-01 1978-08-16 Method and apparatus for processing pal colour television signals in digital form

Publications (2)

Publication Number Publication Date
GB2003695A true GB2003695A (en) 1979-03-14
GB2003695B GB2003695B (en) 1982-03-03

Family

ID=26263163

Family Applications (1)

Application Number Title Priority Date Filing Date
GB7833561A Expired GB2003695B (en) 1977-09-01 1978-08-16 Method and apparatus for processing pal colour television signals in digital form

Country Status (1)

Country Link
GB (1) GB2003695B (en)

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0022405A1 (en) * 1979-07-04 1981-01-14 Thomson-Csf Device for coding video frequency television signals and transmission equipment comprising such a device
EP0033607A2 (en) * 1980-01-30 1981-08-12 Sony Corporation Methods of and arrangements for decoding and recoding composite digital television signals
US4345268A (en) * 1978-03-29 1982-08-17 British Broadcasting Corporation Processing circuit for color television signals
DE3241411A1 (en) * 1981-11-09 1983-05-19 RCA Corp., 10020 New York, N.Y. DIGITAL TV SIGNAL PROCESSING SYSTEM
US4466016A (en) * 1981-05-27 1984-08-14 Rca Corporation Television signal filtering system

Cited By (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4345268A (en) * 1978-03-29 1982-08-17 British Broadcasting Corporation Processing circuit for color television signals
EP0022405A1 (en) * 1979-07-04 1981-01-14 Thomson-Csf Device for coding video frequency television signals and transmission equipment comprising such a device
EP0033607A2 (en) * 1980-01-30 1981-08-12 Sony Corporation Methods of and arrangements for decoding and recoding composite digital television signals
EP0033607A3 (en) * 1980-01-30 1982-02-10 Sony Corporation Methods of and arrangements for decoding and recoding composite digital television signals
US4466016A (en) * 1981-05-27 1984-08-14 Rca Corporation Television signal filtering system
DE3241411A1 (en) * 1981-11-09 1983-05-19 RCA Corp., 10020 New York, N.Y. DIGITAL TV SIGNAL PROCESSING SYSTEM

Also Published As

Publication number Publication date
GB2003695B (en) 1982-03-03

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Legal Events

Date Code Title Description
PCNP Patent ceased through non-payment of renewal fee