GB2275586A - Improvements in television systems - Google Patents

Improvements in television systems

Info

Publication number
GB2275586A
GB2275586A GB9407408A GB9407408A GB2275586A GB 2275586 A GB2275586 A GB 2275586A GB 9407408 A GB9407408 A GB 9407408A GB 9407408 A GB9407408 A GB 9407408A GB 2275586 A GB2275586 A GB 2275586A
Authority
GB
United Kingdom
Prior art keywords
signal
2fsc
borders
frequency components
occupying
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
GB9407408A
Other versions
GB9407408D0 (en
GB2275586B (en
Inventor
Michael George Croll
John Oliver Drewery
James Edward Easterbrook
Graham Alexander Thomas
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
Publication of GB9407408D0 publication Critical patent/GB9407408D0/en
Publication of GB2275586A publication Critical patent/GB2275586A/en
Application granted granted Critical
Publication of GB2275586B publication Critical patent/GB2275586B/en
Anticipated expiration legal-status Critical
Expired - Fee Related legal-status Critical Current

Links

Classifications

    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
    • H04N7/00—Television systems
    • H04N7/007—Systems with supplementary picture signal insertion during a portion of the active part of a television signal, e.g. during top and bottom lines in a HDTV letter-box system
    • 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
    • H04N11/167—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 a resolution-increasing signal being multiplexed to the PAL-system signal, e.g. PAL-PLUS-system
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
    • H04N11/00—Colour television systems
    • H04N11/24—High-definition television systems
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
    • H04N7/00—Television systems
    • H04N7/01—Conversion of standards, e.g. involving analogue television standards or digital television standards processed at pixel level
    • H04N7/0125—Conversion of standards, e.g. involving analogue television standards or digital television standards processed at pixel level one of the standards being a high definition standard

Landscapes

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

Abstract

A PAL wide aspect ratio luminance signal is transmitted in letterbox format with a main signal component occupying the central part of the vertical scan and a helper signal occupying the top and bottom borders. The input signal is sampled at 4/3 x 2fsc and is split into the two parts so that low horizontal frequency components art transmitted at 2fsc in the main component and high horizontal frequency components, e.g. above fsc, in the borders. The border signals are multiplexed up to 2fsc and preferably are frequency inverted. The main signal occupies three-quarters of the number of lines and the borders comprise the remaining one quarter. The resultant 2fsc signal can be applied to the luminance input of a phase segregated Weston PAL decoder for transmission. <IMAGE>
GB9407408A 1991-10-30 1992-10-30 Improvements in television systems Expired - Fee Related GB2275586B (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
GB919123004A GB9123004D0 (en) 1991-10-30 1991-10-30 Improvements in television systems
PCT/GB1992/001988 WO1993009635A1 (en) 1991-10-30 1992-10-30 Improvements in television systems

Publications (3)

Publication Number Publication Date
GB9407408D0 GB9407408D0 (en) 1994-06-29
GB2275586A true GB2275586A (en) 1994-08-31
GB2275586B GB2275586B (en) 1995-07-19

Family

ID=10703756

Family Applications (2)

Application Number Title Priority Date Filing Date
GB919123004A Pending GB9123004D0 (en) 1991-10-30 1991-10-30 Improvements in television systems
GB9407408A Expired - Fee Related GB2275586B (en) 1991-10-30 1992-10-30 Improvements in television systems

Family Applications Before (1)

Application Number Title Priority Date Filing Date
GB919123004A Pending GB9123004D0 (en) 1991-10-30 1991-10-30 Improvements in television systems

Country Status (6)

Country Link
EP (1) EP0610280A1 (en)
JP (1) JPH07500711A (en)
CN (1) CN1076577A (en)
AU (1) AU2808192A (en)
GB (2) GB9123004D0 (en)
WO (1) WO1993009635A1 (en)

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR0177860B1 (en) * 1994-02-04 1999-05-01 모리시타 요이찌 Signal processing apparatus for video signals with a different display format
GB2309134A (en) * 1996-01-12 1997-07-16 Concept Dev Ltd Information inclusion in television broadcasting

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB2113037A (en) * 1979-02-19 1983-07-27 British Broadcasting Corp Method of and apparatus for coding and decoding PAL colour television signals
WO1990006658A1 (en) * 1988-12-07 1990-06-14 Deutsche Thomson-Brandt Gmbh Colour television transmission system
WO1991003906A1 (en) * 1989-09-08 1991-03-21 Deutsche Thomson-Brandt Gmbh Tv transmission system
GB2238202A (en) * 1989-11-17 1991-05-22 British Broadcasting Corp Method for transmitting HDTV signal

Family Cites Families (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH04326275A (en) * 1991-04-25 1992-11-16 Matsushita Electric Ind Co Ltd Method and device for processing television signal

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB2113037A (en) * 1979-02-19 1983-07-27 British Broadcasting Corp Method of and apparatus for coding and decoding PAL colour television signals
WO1990006658A1 (en) * 1988-12-07 1990-06-14 Deutsche Thomson-Brandt Gmbh Colour television transmission system
WO1991003906A1 (en) * 1989-09-08 1991-03-21 Deutsche Thomson-Brandt Gmbh Tv transmission system
GB2238202A (en) * 1989-11-17 1991-05-22 British Broadcasting Corp Method for transmitting HDTV signal

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
Electronics Letters, Vol 26(3), Feb 1990, pp 195-197; C Sandbank. *

Also Published As

Publication number Publication date
EP0610280A1 (en) 1994-08-17
JPH07500711A (en) 1995-01-19
CN1076577A (en) 1993-09-22
GB9407408D0 (en) 1994-06-29
WO1993009635A1 (en) 1993-05-13
GB2275586B (en) 1995-07-19
AU2808192A (en) 1993-06-07
GB9123004D0 (en) 1991-12-18

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Legal Events

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

Effective date: 19981030