GB2328339A - Video signal luminance and chrominance separation - Google Patents

Video signal luminance and chrominance separation

Info

Publication number
GB2328339A
GB2328339A GB9822218A GB9822218A GB2328339A GB 2328339 A GB2328339 A GB 2328339A GB 9822218 A GB9822218 A GB 9822218A GB 9822218 A GB9822218 A GB 9822218A GB 2328339 A GB2328339 A GB 2328339A
Authority
GB
United Kingdom
Prior art keywords
signal
filter
output
video signal
subtraction circuit
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
GB9822218A
Other versions
GB2328339B (en
GB9822218D0 (en
Inventor
Roger Neil Robinson
Roy Steinar Sutherland
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.)
Vistek Electronics Ltd
Original Assignee
Vistek Electronics 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
Priority claimed from GBGB9703143.9A external-priority patent/GB9703143D0/en
Application filed by Vistek Electronics Ltd filed Critical Vistek Electronics Ltd
Priority to GB9822218A priority Critical patent/GB2328339B/en
Publication of GB9822218D0 publication Critical patent/GB9822218D0/en
Publication of GB2328339A publication Critical patent/GB2328339A/en
Application granted granted Critical
Publication of GB2328339B publication Critical patent/GB2328339B/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
    • 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 video signal decoder including a comb filter (5, 6) characterised by means for changing the operating mode of the filter (5, 6) progressively. Also, a video signal decoder including a comb filter (5, 6) characterised by means for adjusting continuously the degree of filtering performed by the filter (5, 6). In one arrangement the decoder comprises an input filter (4) and two signal multipliers (8, 9) wherein one of the multipliers (9) is connected to receive a signal (102) output by the input filter (4) and the other multiplier is connected to receive a signal (104) output by the comb filter (5, 6) and wherein operation of the multipliers (8, 9) is mutually interdependent. In another arrangement, the decoder comprises an input filter (4), a subtraction circuit (14) and a signal multiplier (12); the multiplier (12) being connected to receive an output from the comb filter (5, 6) and multiply said output by a variable factor so as to input a multiplied signal to said subtraction circuit (14); the subtraction circuit (14) being connected to perform a subtraction between the multiplied signal and a signal output by the input filter (4), the subtraction circuit (14) having an output which provides a chrominance signal.
GB9822218A 1997-02-14 1998-02-16 Video signal luminance and chrominance separation Expired - Fee Related GB2328339B (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
GB9822218A GB2328339B (en) 1997-02-14 1998-02-16 Video signal luminance and chrominance separation

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
GBGB9703143.9A GB9703143D0 (en) 1997-02-14 1997-02-14 An improved method of luminance and chrominance separation for video signals
GB9822218A GB2328339B (en) 1997-02-14 1998-02-16 Video signal luminance and chrominance separation
PCT/GB1998/000475 WO1998036578A1 (en) 1997-02-14 1998-02-16 Video signal luminance and chrominance separation

Publications (3)

Publication Number Publication Date
GB9822218D0 GB9822218D0 (en) 1998-12-02
GB2328339A true GB2328339A (en) 1999-02-17
GB2328339B GB2328339B (en) 2001-08-08

Family

ID=26311004

Family Applications (1)

Application Number Title Priority Date Filing Date
GB9822218A Expired - Fee Related GB2328339B (en) 1997-02-14 1998-02-16 Video signal luminance and chrominance separation

Country Status (1)

Country Link
GB (1) GB2328339B (en)

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS612488A (en) * 1984-06-15 1986-01-08 Matsushita Electric Ind Co Ltd Device for separating carrier chrominance signal from luminance signal
GB2170975A (en) * 1985-01-14 1986-08-13 Nec Corp Luminance/chrominance separating apparatus
EP0340098A1 (en) * 1988-04-29 1989-11-02 Laboratoire Europeen De Recherches Electroniques Avancees Device for separating chrominance and luminance and television receiver including such a device
EP0362747A2 (en) * 1988-10-04 1990-04-11 RCA Thomson Licensing Corporation Circuitry for comb filtering PAL and NTSC video signals

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS612488A (en) * 1984-06-15 1986-01-08 Matsushita Electric Ind Co Ltd Device for separating carrier chrominance signal from luminance signal
GB2170975A (en) * 1985-01-14 1986-08-13 Nec Corp Luminance/chrominance separating apparatus
EP0340098A1 (en) * 1988-04-29 1989-11-02 Laboratoire Europeen De Recherches Electroniques Avancees Device for separating chrominance and luminance and television receiver including such a device
EP0362747A2 (en) * 1988-10-04 1990-04-11 RCA Thomson Licensing Corporation Circuitry for comb filtering PAL and NTSC video signals

Non-Patent Citations (2)

* Cited by examiner, † Cited by third party
Title
OWASHI H ET AL,IEEE PROC OF THE CUSTOM INTEGRATED CIRCUITS CONF, 15-18 MAY 1989, pages 1161-1164 *
PATENT ABSTRACTS OF JAPAN vol. 10, no. 137 (E-405) & JP 61-002488 *

Also Published As

Publication number Publication date
GB2328339B (en) 2001-08-08
GB9822218D0 (en) 1998-12-02

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Legal Events

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

Effective date: 20090216