JPS57123786A - Suppressor for chroma signal - Google Patents

Suppressor for chroma signal

Info

Publication number
JPS57123786A
JPS57123786A JP56009351A JP935181A JPS57123786A JP S57123786 A JPS57123786 A JP S57123786A JP 56009351 A JP56009351 A JP 56009351A JP 935181 A JP935181 A JP 935181A JP S57123786 A JPS57123786 A JP S57123786A
Authority
JP
Japan
Prior art keywords
suppression
level
directional
signal
chroma 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
JP56009351A
Other languages
Japanese (ja)
Other versions
JPS6255760B2 (en
Inventor
Michio Kuribayashi
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.)
Akai Electric Co Ltd
Original Assignee
Akai Electric Co 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 Akai Electric Co Ltd filed Critical Akai Electric Co Ltd
Priority to JP56009351A priority Critical patent/JPS57123786A/en
Publication of JPS57123786A publication Critical patent/JPS57123786A/en
Publication of JPS6255760B2 publication Critical patent/JPS6255760B2/ja
Granted 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

Landscapes

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

Abstract

PURPOSE:To obtain a more natural picture when a chroma signal suppressed compared with a picture obtained by linear suppression, by suppressing the chroma signal in an undesired range gradually. CONSTITUTION:Signals from the 1st level detector 1 which detects a luminance signal being below a predetermined level in a black direction and from the 2nd level detector 2 which detects the luminance signal being above the predetermined level in a white direction are supplied to a multiplier 3 together with a chroma signal ec. Then, an output signal obtained by gradually suppressing chroma signals below a predetermined black-directional suppression level and a above a predetermined white-directional suppression level from their suppression points appears at an output terminal T2. Namely, a black-directional and a white-directional period are suppressed ones in the unnecessary range of the chroma signal ec, and the suppression is performed not linearly, but gradually and slowly at the suppression point.
JP56009351A 1981-01-23 1981-01-23 Suppressor for chroma signal Granted JPS57123786A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP56009351A JPS57123786A (en) 1981-01-23 1981-01-23 Suppressor for chroma signal

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP56009351A JPS57123786A (en) 1981-01-23 1981-01-23 Suppressor for chroma signal

Publications (2)

Publication Number Publication Date
JPS57123786A true JPS57123786A (en) 1982-08-02
JPS6255760B2 JPS6255760B2 (en) 1987-11-20

Family

ID=11718043

Family Applications (1)

Application Number Title Priority Date Filing Date
JP56009351A Granted JPS57123786A (en) 1981-01-23 1981-01-23 Suppressor for chroma signal

Country Status (1)

Country Link
JP (1) JPS57123786A (en)

Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5234630A (en) * 1975-09-11 1977-03-16 Sony Corp Colr image pickup device

Patent Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5234630A (en) * 1975-09-11 1977-03-16 Sony Corp Colr image pickup device

Also Published As

Publication number Publication date
JPS6255760B2 (en) 1987-11-20

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