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JPS57174985A - Aperture correcting circuit - Google Patents

Aperture correcting circuit

Info

Publication number
JPS57174985A
JPS57174985A JP56060220A JP6022081A JPS57174985A JP S57174985 A JPS57174985 A JP S57174985A JP 56060220 A JP56060220 A JP 56060220A JP 6022081 A JP6022081 A JP 6022081A JP S57174985 A JPS57174985 A JP S57174985A
Authority
JP
Japan
Prior art keywords
video signal
signal
high frequency
amplifier
frequency component
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.)
Pending
Application number
JP56060220A
Other languages
Japanese (ja)
Inventor
Kunihiko Yamakawa
Yoshinori Kitamura
Teruo Saito
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.)
Panasonic Holdings Corp
Original Assignee
Matsushita Electric Industrial 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 Matsushita Electric Industrial Co Ltd filed Critical Matsushita Electric Industrial Co Ltd
Priority to JP56060220A priority Critical patent/JPS57174985A/en
Publication of JPS57174985A publication Critical patent/JPS57174985A/en
Pending legal-status Critical Current

Links

Classifications

    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
    • H04N5/00—Details of television systems
    • H04N5/14—Picture signal circuitry for video frequency region
    • H04N5/20—Circuitry for controlling amplitude response
    • H04N5/205—Circuitry for controlling amplitude response for correcting amplitude versus frequency characteristic
    • H04N5/208—Circuitry for controlling amplitude response for correcting amplitude versus frequency characteristic for compensating for attenuation of high frequency components, e.g. crispening, aperture distortion correction

Landscapes

  • Engineering & Computer Science (AREA)
  • Multimedia (AREA)
  • Signal Processing (AREA)
  • Picture Signal Circuits (AREA)

Abstract

PURPOSE:To improve picture quality by correcting an aperture automatically according to the high frequency component of a video signal by controlling aperture correction by a controlling means according to the amount of a signal obtained by detecting the edge component of the video signal. CONSTITUTION:A video signal from a signal source 1 is matched with a delay circuit 3 through a characteristic impedance element 2, and a video signal delayed by the circuit 3 and the undelayed video signal are processed by a subtracter 4, whose output is supplied to a rectifying circuit 7 and an amplifier 8. Then, the edge component of a high frequency signal is detected by the subtracter 4 and the high frequency component of the video signal is detected by the rectifying circuit 7 in the form of a DC voltage, on the basis of which the gain of the amplifier 8 is varied. The output of the amplifier 8 is applied to an adder 6 to perform aperture correction automatically according to the amount of the high frequency component contained in the video signal, and thus is made to an image signal having the most suitable sharpness for the video signal, thereby improving the picture quality of the image signal.
JP56060220A 1981-04-20 1981-04-20 Aperture correcting circuit Pending JPS57174985A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP56060220A JPS57174985A (en) 1981-04-20 1981-04-20 Aperture correcting circuit

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP56060220A JPS57174985A (en) 1981-04-20 1981-04-20 Aperture correcting circuit

Publications (1)

Publication Number Publication Date
JPS57174985A true JPS57174985A (en) 1982-10-27

Family

ID=13135854

Family Applications (1)

Application Number Title Priority Date Filing Date
JP56060220A Pending JPS57174985A (en) 1981-04-20 1981-04-20 Aperture correcting circuit

Country Status (1)

Country Link
JP (1) JPS57174985A (en)

Cited By (10)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS60199272A (en) * 1984-03-23 1985-10-08 Mitsubishi Electric Corp Profile correcting device of video signal
JPS60199271A (en) * 1984-03-23 1985-10-08 Mitsubishi Electric Corp Profile correcting device of video signal
JPS60199274A (en) * 1984-03-23 1985-10-08 Mitsubishi Electric Corp Profile correcting device of video signal
JPS60199273A (en) * 1984-03-23 1985-10-08 Mitsubishi Electric Corp Profile correcting device of video signal
JPH01198871A (en) * 1988-02-03 1989-08-10 Sony Corp Contour emphasizing circuit
JPH0213179A (en) * 1988-04-06 1990-01-17 Yves C Faroudja Television signal transition booster
JPH02174376A (en) * 1988-12-26 1990-07-05 Matsushita Electric Ind Co Ltd Picture quality correction circuit
JPH04101578A (en) * 1990-08-21 1992-04-03 Matsushita Electric Ind Co Ltd Contour correction circuit for luminance signal of television receiver
JPH04196771A (en) * 1990-11-28 1992-07-16 Hitachi Ltd Waveform equalization device
JPH05316392A (en) * 1992-05-14 1993-11-26 Matsushita Electric Ind Co Ltd Contour correction device

Cited By (11)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS60199272A (en) * 1984-03-23 1985-10-08 Mitsubishi Electric Corp Profile correcting device of video signal
JPS60199271A (en) * 1984-03-23 1985-10-08 Mitsubishi Electric Corp Profile correcting device of video signal
JPS60199274A (en) * 1984-03-23 1985-10-08 Mitsubishi Electric Corp Profile correcting device of video signal
JPS60199273A (en) * 1984-03-23 1985-10-08 Mitsubishi Electric Corp Profile correcting device of video signal
JPH01198871A (en) * 1988-02-03 1989-08-10 Sony Corp Contour emphasizing circuit
JPH0213179A (en) * 1988-04-06 1990-01-17 Yves C Faroudja Television signal transition booster
JPH02174376A (en) * 1988-12-26 1990-07-05 Matsushita Electric Ind Co Ltd Picture quality correction circuit
JPH04101578A (en) * 1990-08-21 1992-04-03 Matsushita Electric Ind Co Ltd Contour correction circuit for luminance signal of television receiver
JPH04196771A (en) * 1990-11-28 1992-07-16 Hitachi Ltd Waveform equalization device
JP2865853B2 (en) * 1990-11-28 1999-03-08 株式会社日立製作所 Waveform equalizer
JPH05316392A (en) * 1992-05-14 1993-11-26 Matsushita Electric Ind Co Ltd Contour correction device

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