JPS573475A - Picture quality adjusting circuit - Google Patents

Picture quality adjusting circuit

Info

Publication number
JPS573475A
JPS573475A JP7666880A JP7666880A JPS573475A JP S573475 A JPS573475 A JP S573475A JP 7666880 A JP7666880 A JP 7666880A JP 7666880 A JP7666880 A JP 7666880A JP S573475 A JPS573475 A JP S573475A
Authority
JP
Japan
Prior art keywords
video signal
picture quality
frequency component
inputted
picked
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
JP7666880A
Other languages
Japanese (ja)
Other versions
JPS6339145B2 (en
Inventor
Koichi Sunada
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.)
NEC Home Electronics Ltd
NEC Corp
Original Assignee
NEC Home Electronics Ltd
Nippon 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 NEC Home Electronics Ltd, Nippon Electric Co Ltd filed Critical NEC Home Electronics Ltd
Priority to JP7666880A priority Critical patent/JPS573475A/en
Publication of JPS573475A publication Critical patent/JPS573475A/en
Publication of JPS6339145B2 publication Critical patent/JPS6339145B2/ja
Granted 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

Landscapes

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

Abstract

PURPOSE:To accomplish an optimum picture quality with good resolution, by applying high frequency component of a video signal picked up via a pair of differential amplifiers and a low frequency component picked up via one differential amplifier having a picture quality controlling variable resistor. CONSTITUTION:A video signal A is given to a pair of differential amplifiers I1, II2 connected differentially and a high frequency component C only is inputted to one of a matrix circuit 8 via an HPF6 of the second order differential circuit via a common load resistor 5. At the same time, the video signal A is also inputted to a current source 3 of the differential amplifier I1 having a picture quality controlling variable resistor VR1, and a low frequency component B only is picked up via an LPF7 of an integration circuit and inputted to another of the matrix circuit 8. Thus, the peaking amount of the video signal produced via the current source 3 is controlled inversely proportional to the level of the video signal applied to the differential amplifiers I1 and II2, and the compensation of picture quality is automatically controlled through the contrast, and the optimum picture with good resolution to any video signal level is obtained.
JP7666880A 1980-06-09 1980-06-09 Picture quality adjusting circuit Granted JPS573475A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP7666880A JPS573475A (en) 1980-06-09 1980-06-09 Picture quality adjusting circuit

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP7666880A JPS573475A (en) 1980-06-09 1980-06-09 Picture quality adjusting circuit

Publications (2)

Publication Number Publication Date
JPS573475A true JPS573475A (en) 1982-01-08
JPS6339145B2 JPS6339145B2 (en) 1988-08-03

Family

ID=13611787

Family Applications (1)

Application Number Title Priority Date Filing Date
JP7666880A Granted JPS573475A (en) 1980-06-09 1980-06-09 Picture quality adjusting circuit

Country Status (1)

Country Link
JP (1) JPS573475A (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS6214584A (en) * 1985-07-12 1987-01-23 Canon Inc Image pickup device

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH01173148U (en) * 1988-05-25 1989-12-08

Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5574274A (en) * 1978-11-30 1980-06-04 Toshiba Corp Adjuster for video quality

Patent Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5574274A (en) * 1978-11-30 1980-06-04 Toshiba Corp Adjuster for video quality

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS6214584A (en) * 1985-07-12 1987-01-23 Canon Inc Image pickup device

Also Published As

Publication number Publication date
JPS6339145B2 (en) 1988-08-03

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