JPS5628570A - Video signal processing circuit - Google Patents

Video signal processing circuit

Info

Publication number
JPS5628570A
JPS5628570A JP10461679A JP10461679A JPS5628570A JP S5628570 A JPS5628570 A JP S5628570A JP 10461679 A JP10461679 A JP 10461679A JP 10461679 A JP10461679 A JP 10461679A JP S5628570 A JPS5628570 A JP S5628570A
Authority
JP
Japan
Prior art keywords
level
circuit
signal
video
video 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.)
Pending
Application number
JP10461679A
Other languages
Japanese (ja)
Inventor
Takafumi Okada
Atsushi Matsuzaki
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.)
Sony Corp
Original Assignee
Sony Corp
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 Sony Corp filed Critical Sony Corp
Priority to JP10461679A priority Critical patent/JPS5628570A/en
Priority to US06/177,574 priority patent/US4403254A/en
Priority to GB8026802A priority patent/GB2058515B/en
Priority to NL8004625A priority patent/NL8004625A/en
Priority to FR8018058A priority patent/FR2469847B1/en
Publication of JPS5628570A publication Critical patent/JPS5628570A/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
    • H04N5/16—Circuitry for reinsertion of dc and slowly varying components of signal; Circuitry for preservation of black or white level
    • H04N5/18—Circuitry for reinsertion of dc and slowly varying components of signal; Circuitry for preservation of black or white level by means of "clamp" circuit operated by switching circuit
    • H04N5/185—Circuitry for reinsertion of dc and slowly varying components of signal; Circuitry for preservation of black or white level by means of "clamp" circuit operated by switching circuit for the black level

Landscapes

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

Abstract

PURPOSE:To prevent fluctuation of the black level, by detecting the level, which is in the most black side and is blacker than a prescribed level, in the video period and by regarding this level as black to set this level as the cut-off level of the Braun tube. CONSTITUTION:The video signal supplied from a video detecting circuit to terminal 1 is input to clamp circuit 2, and video signal S1 which has the pedestal level set to prescribed level V0 by the clamp pulse from terminal 3 is obtained and is supplied to blanking circuit 4, and output signal S2 which has a section wider than the horizontal balnking time blanked by blanking pulse P1 from terminal 5 is generated and is supplied to peak hold circuit 6 to form hold output S3 corresponding to the peak level in the most black side in the video period, and this output S3 is compared with video signal S1 by comparator 8, and signal S4 whcih is more white-side level one of both signals is generated and is input to clamp circuit 10, thus obtaining signal S5 with the blanking time arranged into a prescribed level by clamp pulse P2.
JP10461679A 1979-08-17 1979-08-17 Video signal processing circuit Pending JPS5628570A (en)

Priority Applications (5)

Application Number Priority Date Filing Date Title
JP10461679A JPS5628570A (en) 1979-08-17 1979-08-17 Video signal processing circuit
US06/177,574 US4403254A (en) 1979-08-17 1980-08-13 Video signal processing circuit
GB8026802A GB2058515B (en) 1979-08-17 1980-08-15 Video signal processing circuits
NL8004625A NL8004625A (en) 1979-08-17 1980-08-15 VIDEO SIGNAL OPERATION CIRCUIT, IN PARTICULAR FOR APPLICATION TO A TELEVISION RECEIVER.
FR8018058A FR2469847B1 (en) 1979-08-17 1980-08-18 VIDEO SIGNAL PROCESSING CIRCUIT

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP10461679A JPS5628570A (en) 1979-08-17 1979-08-17 Video signal processing circuit

Publications (1)

Publication Number Publication Date
JPS5628570A true JPS5628570A (en) 1981-03-20

Family

ID=14385366

Family Applications (1)

Application Number Title Priority Date Filing Date
JP10461679A Pending JPS5628570A (en) 1979-08-17 1979-08-17 Video signal processing circuit

Country Status (1)

Country Link
JP (1) JPS5628570A (en)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS59166159A (en) * 1983-03-11 1984-09-19 東レ株式会社 Dialytic membrane
US7976709B2 (en) 2005-02-16 2011-07-12 Triomed Ab System and method for regeneration of a fluid

Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5187911A (en) * 1975-01-30 1976-07-31 Sony Corp
JPS52100915A (en) * 1976-02-20 1977-08-24 Hitachi Ltd Dc restoration circuit

Patent Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5187911A (en) * 1975-01-30 1976-07-31 Sony Corp
JPS52100915A (en) * 1976-02-20 1977-08-24 Hitachi Ltd Dc restoration circuit

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS59166159A (en) * 1983-03-11 1984-09-19 東レ株式会社 Dialytic membrane
US7976709B2 (en) 2005-02-16 2011-07-12 Triomed Ab System and method for regeneration of a fluid

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