JPS5713869A - Agc voltage detector - Google Patents

Agc voltage detector

Info

Publication number
JPS5713869A
JPS5713869A JP8729780A JP8729780A JPS5713869A JP S5713869 A JPS5713869 A JP S5713869A JP 8729780 A JP8729780 A JP 8729780A JP 8729780 A JP8729780 A JP 8729780A JP S5713869 A JPS5713869 A JP S5713869A
Authority
JP
Japan
Prior art keywords
circuit
composite video
video signal
current
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.)
Granted
Application number
JP8729780A
Other languages
Japanese (ja)
Other versions
JPS6351432B2 (en
Inventor
Norio Meki
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 JP8729780A priority Critical patent/JPS5713869A/en
Publication of JPS5713869A publication Critical patent/JPS5713869A/en
Publication of JPS6351432B2 publication Critical patent/JPS6351432B2/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
    • H04N5/44—Receiver circuitry for the reception of television signals according to analogue transmission standards
    • H04N5/52—Automatic gain control
    • H04N5/53—Keyed automatic gain control

Landscapes

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

Abstract

PURPOSE:To stabilize the operation of an AGC circuit by detecting the intensity of a synchronizing signal contained in a composite video signal with simple circuit constitution and by controlling the gain of a variable gain circuit on the basis of its detection voltage. CONSTITUTION:A composite video signal with the positive polarity from an input terminal 1 is clamped by a diode D1 and then supplied to the base of a transistor TRT1. This TRT1 and another TRT2 constitute a differential amplifier to hold the peak potential V2 of a synchronizing signal in a composite video signal from an output terminal 2 constant regardless of the intensity of the composite video signal from the input terminal 1. The synchronizing signal separated from the composite video signal is delayed by about 2-3musec to generate a pulse signal (a), which drives a switch circuit 3; when the circuit 3 turns on, a current I2 is flowed from a current source to a diode D2 to flow a current equal to the current I2 to the collector of a TRT3, constituting a current Miller circuit, via the TRT3, thus stabilizing the operation of an AGC circuit.
JP8729780A 1980-06-26 1980-06-26 Agc voltage detector Granted JPS5713869A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP8729780A JPS5713869A (en) 1980-06-26 1980-06-26 Agc voltage detector

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP8729780A JPS5713869A (en) 1980-06-26 1980-06-26 Agc voltage detector

Publications (2)

Publication Number Publication Date
JPS5713869A true JPS5713869A (en) 1982-01-23
JPS6351432B2 JPS6351432B2 (en) 1988-10-13

Family

ID=13910878

Family Applications (1)

Application Number Title Priority Date Filing Date
JP8729780A Granted JPS5713869A (en) 1980-06-26 1980-06-26 Agc voltage detector

Country Status (1)

Country Link
JP (1) JPS5713869A (en)

Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5492126A (en) * 1977-12-29 1979-07-21 Matsushita Electric Ind Co Ltd Agc voltage detection circuit

Patent Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5492126A (en) * 1977-12-29 1979-07-21 Matsushita Electric Ind Co Ltd Agc voltage detection circuit

Also Published As

Publication number Publication date
JPS6351432B2 (en) 1988-10-13

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