JPS6461178A - Video signal gain control circuit - Google Patents

Video signal gain control circuit

Info

Publication number
JPS6461178A
JPS6461178A JP21758187A JP21758187A JPS6461178A JP S6461178 A JPS6461178 A JP S6461178A JP 21758187 A JP21758187 A JP 21758187A JP 21758187 A JP21758187 A JP 21758187A JP S6461178 A JPS6461178 A JP S6461178A
Authority
JP
Japan
Prior art keywords
variable gain
ratio
signals
gain amplifier
output
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
JP21758187A
Other languages
Japanese (ja)
Inventor
Hideto Suzuki
Hideki Arai
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 JP21758187A priority Critical patent/JPS6461178A/en
Publication of JPS6461178A publication Critical patent/JPS6461178A/en
Pending legal-status Critical Current

Links

Landscapes

  • Television Receiver Circuits (AREA)
  • Control Of Amplification And Gain Control (AREA)

Abstract

PURPOSE:To obtain a stable gain by detecting a horizontal synchronizing signal of an input/output video signal of a variable gain amplifier and supplying the control signal based on the ratio of the levels of the synchronizing signals to the variable gain amplifier. CONSTITUTION:Level detection circuits 13, 14 detect respectively the levels of the horizontal synchronizing signal of the input/output video signals of the variable gain amplifier 10. Coefficient multiplication circuits 15, 16 multiply respectively coefficients k1, k2 with output signals IS, OS of the detection circuits 13, 14. An output ratio setting circuit 18 adjusts the coefficients k1, k2 to bring the ratio of the signals OS, IS to a prescribed value. The comparator circuit 17 supplies the voltage in response to the output error of the circuits 15, 16 to the VCR 12 of the variable gain amplifier 10. The k1IS and k2OS are controlled to be equal to each other in this way, then the ratio of the signal OS, IS is controlled to be a prescribed value. In this case, since the amplifier 10 is incorporated in the closed loop, the fluctuation factor of the characteristic is absorbed.
JP21758187A 1987-08-31 1987-08-31 Video signal gain control circuit Pending JPS6461178A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP21758187A JPS6461178A (en) 1987-08-31 1987-08-31 Video signal gain control circuit

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP21758187A JPS6461178A (en) 1987-08-31 1987-08-31 Video signal gain control circuit

Publications (1)

Publication Number Publication Date
JPS6461178A true JPS6461178A (en) 1989-03-08

Family

ID=16706523

Family Applications (1)

Application Number Title Priority Date Filing Date
JP21758187A Pending JPS6461178A (en) 1987-08-31 1987-08-31 Video signal gain control circuit

Country Status (1)

Country Link
JP (1) JPS6461178A (en)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH0590855A (en) * 1991-09-30 1993-04-09 Nec Corp Agc circuit
JP2012513153A (en) * 2008-12-18 2012-06-07 テレフオンアクチーボラゲット エル エム エリクソン（パブル） System and method for filtering signals

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH0590855A (en) * 1991-09-30 1993-04-09 Nec Corp Agc circuit
JP2012513153A (en) * 2008-12-18 2012-06-07 テレフオンアクチーボラゲット エル エム エリクソン（パブル） System and method for filtering signals
US8688758B2 (en) 2008-12-18 2014-04-01 Telefonaktiebolaget Lm Ericsson (Publ) Systems and methods for filtering a signal

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