JPS57104383A - Video detection circuit - Google Patents

Video detection circuit

Info

Publication number
JPS57104383A
JPS57104383A JP18071080A JP18071080A JPS57104383A JP S57104383 A JPS57104383 A JP S57104383A JP 18071080 A JP18071080 A JP 18071080A JP 18071080 A JP18071080 A JP 18071080A JP S57104383 A JPS57104383 A JP S57104383A
Authority
JP
Japan
Prior art keywords
video
amplifier
oscillator
vif
circuit
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
JP18071080A
Other languages
Japanese (ja)
Inventor
Tetsuo Kuchiki
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 JP18071080A priority Critical patent/JPS57104383A/en
Publication of JPS57104383A publication Critical patent/JPS57104383A/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
    • H04N5/44—Receiver circuitry for the reception of television signals according to analogue transmission standards
    • H04N5/455—Demodulation-circuits

Landscapes

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

Abstract

PURPOSE:To prevent an oscillation output of a video carrier from feedback to the input side of a VIF amplifier, by decreasing the gain of a video carrier oscillator for a synchronizing detection circuit when an RF input signal is small and the gain of the VIF amplifier circuit is large. CONSTITUTION:An RF input from an antenna is inputted to a multiplication circuit 5 via a tuner 1 and a VIF amplifier 2 and after it is multiplied and detected, the result is inputted to a video amplifier 6. An oscillator AGC voltage is formed at an oscilator AGC circuit 11 based on a VIF-AGC voltage generated depending on the amplitude of a video detection output at the video amplifier 6 and this is fed back to the oscillator 8, allowing to control the oscillation output of the oscillator 8 automatically, when the RF input is small.
JP18071080A 1980-12-19 1980-12-19 Video detection circuit Pending JPS57104383A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP18071080A JPS57104383A (en) 1980-12-19 1980-12-19 Video detection circuit

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP18071080A JPS57104383A (en) 1980-12-19 1980-12-19 Video detection circuit

Publications (1)

Publication Number Publication Date
JPS57104383A true JPS57104383A (en) 1982-06-29

Family

ID=16087953

Family Applications (1)

Application Number Title Priority Date Filing Date
JP18071080A Pending JPS57104383A (en) 1980-12-19 1980-12-19 Video detection circuit

Country Status (1)

Country Link
JP (1) JPS57104383A (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS60229583A (en) * 1984-04-27 1985-11-14 Sony Corp Demodulating circuit for am-modulated video signal

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS60229583A (en) * 1984-04-27 1985-11-14 Sony Corp Demodulating circuit for am-modulated video signal

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