JPS55145492A - Picture quality improving circuit for color television receiver - Google Patents

Picture quality improving circuit for color television receiver

Info

Publication number
JPS55145492A
JPS55145492A JP5343179A JP5343179A JPS55145492A JP S55145492 A JPS55145492 A JP S55145492A JP 5343179 A JP5343179 A JP 5343179A JP 5343179 A JP5343179 A JP 5343179A JP S55145492 A JPS55145492 A JP S55145492A
Authority
JP
Japan
Prior art keywords
circuit
frequency component
luminance signal
signal
high frequency
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
JP5343179A
Other languages
Japanese (ja)
Other versions
JPS6219117B2 (en
Inventor
Toshio Murakami
Masaru Noda
Hiroaki Nabeyama
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.)
Hitachi Ltd
Original Assignee
Hitachi 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 Hitachi Ltd filed Critical Hitachi Ltd
Priority to JP5343179A priority Critical patent/JPS55145492A/en
Publication of JPS55145492A publication Critical patent/JPS55145492A/en
Publication of JPS6219117B2 publication Critical patent/JPS6219117B2/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)
  • Picture Signal Circuits (AREA)
  • Processing Of Color Television Signals (AREA)

Abstract

PURPOSE:To secure the effective correction for the detail information of the lost luminance signal and the improving effect of the picture quality only when the detail information of the luminance signal exists simultaneously at the colored pattern part, by giving the control to the amplitude of the high-band frequency component of the luminance signal in accordance with the chroma. CONSTITUTION:The luminance signal passed through carrier chrominance signal suppressing circuit 2 and delay circuit 3 is isolated for the low and high frequency components through low- and high-band filters 4 and 5 each. And the low frequency component is applied directly to adder circuit 10; while the high frequency component is applied to gain control circuit 7 as well as to waveform shaping circuit 11. The high frequency component of the luminance signal applied to circuit 7 undergoes the gain control with the control signal applied to terminal 9 and then applied to circuit 10 to be added with the low frequency component. The high frequency component of the luminance signal which received the waveform shaping at circuit 11 is applied to one input terminal of AND circuit 12; while the detection signal according to the chroma of the picture which is detected at chroma detecting circuit 8 is applied to the other terminal from chrominance signal circuit 6. And the AND signal of both signals is applied to control terminal 9.
JP5343179A 1979-05-02 1979-05-02 Picture quality improving circuit for color television receiver Granted JPS55145492A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP5343179A JPS55145492A (en) 1979-05-02 1979-05-02 Picture quality improving circuit for color television receiver

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP5343179A JPS55145492A (en) 1979-05-02 1979-05-02 Picture quality improving circuit for color television receiver

Publications (2)

Publication Number Publication Date
JPS55145492A true JPS55145492A (en) 1980-11-13
JPS6219117B2 JPS6219117B2 (en) 1987-04-27

Family

ID=12942646

Family Applications (1)

Application Number Title Priority Date Filing Date
JP5343179A Granted JPS55145492A (en) 1979-05-02 1979-05-02 Picture quality improving circuit for color television receiver

Country Status (1)

Country Link
JP (1) JPS55145492A (en)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5621480A (en) * 1993-04-19 1997-04-15 Mitsubishi Denki Kabushiki Kaisha Image quality correction circuit and method based on color density
US6002448A (en) * 1993-04-19 1999-12-14 Mitsubishi Denki Kabushiki Kaisha Image quality correction circuit and method based on color density

Cited By (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5621480A (en) * 1993-04-19 1997-04-15 Mitsubishi Denki Kabushiki Kaisha Image quality correction circuit and method based on color density
US5663769A (en) * 1993-04-19 1997-09-02 Mitsubishi Denki Kabushiki Kaisha Image quality correction circuit based on color density
US5910823A (en) * 1993-04-19 1999-06-08 Mitsubishi Denki Kabushiki Kaisha Image quality correction circuit and method based on color density
US6002448A (en) * 1993-04-19 1999-12-14 Mitsubishi Denki Kabushiki Kaisha Image quality correction circuit and method based on color density
US6018373A (en) * 1993-04-19 2000-01-25 Mitsubishi Denki Kabushiki Kaisha Image quality correction circuit and method based on color density
US6023304A (en) * 1993-04-19 2000-02-08 Mitsubishi Denki Kabushiki Kaisha Image quality correction circuit and method based on color density
US6081302A (en) * 1993-04-19 2000-06-27 Mitsubishi Denki Kabushiki Kaisha Image quality correction circuit and method based on color density

Also Published As

Publication number Publication date
JPS6219117B2 (en) 1987-04-27

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