JPS56149871A - Automatic gain control circuit of television signal - Google Patents

Automatic gain control circuit of television signal

Info

Publication number
JPS56149871A
JPS56149871A JP5383180A JP5383180A JPS56149871A JP S56149871 A JPS56149871 A JP S56149871A JP 5383180 A JP5383180 A JP 5383180A JP 5383180 A JP5383180 A JP 5383180A JP S56149871 A JPS56149871 A JP S56149871A
Authority
JP
Japan
Prior art keywords
circuit
output
signals
input
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
JP5383180A
Other languages
Japanese (ja)
Inventor
Taku Kamura
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 JP5383180A priority Critical patent/JPS56149871A/en
Publication of JPS56149871A publication Critical patent/JPS56149871A/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

Landscapes

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

Abstract

PURPOSE:To enable to automatically adjust the relative levels of two TV signals and utilize both signals effectively, by obtaining an output by which the respective pedestal parts of the two TV signals correspond to each other in time and sample- holding the difference between components of the two input signals by the said output. CONSTITUTION:Two TV signals which have been input to the signal input terminal 1' are provided to the differential component sampling circuit 3', and the DC potential corresponding to the amplitude is output from the circuit 3'. Also, a signal which has been delayed by the 1H delaying circuit 2' is provided to the circuit 3' through the gain control circuit 8. The gain of this circuit 8 is controlled by the output which has been detected by the detecting circuit 7. And, the 1H delaying circuit 2' prevents a level variation caused by temperature characteristic or time aging, etc. so that the differential component of two input signals can be sample-held, the output of the circuit 3' is provided to the amplitude limiting circuit 4', the signal amplitude exceeding a prescribed value is limited, the mean DC potential of the input signal is provided to the adder 5', and the DC potential is added to the input signal, which is output from the output terminal 6.
JP5383180A 1980-04-22 1980-04-22 Automatic gain control circuit of television signal Pending JPS56149871A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP5383180A JPS56149871A (en) 1980-04-22 1980-04-22 Automatic gain control circuit of television signal

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP5383180A JPS56149871A (en) 1980-04-22 1980-04-22 Automatic gain control circuit of television signal

Publications (1)

Publication Number Publication Date
JPS56149871A true JPS56149871A (en) 1981-11-19

Family

ID=12953725

Family Applications (1)

Application Number Title Priority Date Filing Date
JP5383180A Pending JPS56149871A (en) 1980-04-22 1980-04-22 Automatic gain control circuit of television signal

Country Status (1)

Country Link
JP (1) JPS56149871A (en)

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