JPS5739678A - Detection circuit for automatic gain control voltage - Google Patents

Detection circuit for automatic gain control voltage

Info

Publication number
JPS5739678A
JPS5739678A JP11522580A JP11522580A JPS5739678A JP S5739678 A JPS5739678 A JP S5739678A JP 11522580 A JP11522580 A JP 11522580A JP 11522580 A JP11522580 A JP 11522580A JP S5739678 A JPS5739678 A JP S5739678A
Authority
JP
Japan
Prior art keywords
gain control
diode
voltage
pulse
terminal
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
JP11522580A
Other languages
Japanese (ja)
Inventor
Ichiro Ikegami
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 JP11522580A priority Critical patent/JPS5739678A/en
Publication of JPS5739678A publication Critical patent/JPS5739678A/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
    • H04N5/52—Automatic gain control

Abstract

PURPOSE:To increase the automatic gain control sensitivity, by converting a video signal voltage and a reference pulse voltage into currents, and flowing them to two diodes and adding said diode currents and making the result a gain control voltage. CONSTITUTION:A synchronizing tip of a video signal to detect the level applied to a terminal 101 is clamped to a reference voltage Vref with a horizontal synchronizing pulse applied to a terminal 102. The video signal is converted into a current flowing to a diode D101 and the voltage Vref is a current flowing to a diode D103. Since a transistor Q105 acts like a switch because the base is applied with a negative delay synchronizing pulse with a given time delay from the horizontal synchronizing signal, no current flows to the diode D103 during the period of pulse at ''H'' and the output of addition of a signal to detect video and the reference pulse is obtained at a resistor R104. The added output is applied to a control terminal (a) and the reference voltage is applied to the terminal (b) to control the gain control amplifier.
JP11522580A 1980-08-20 1980-08-20 Detection circuit for automatic gain control voltage Pending JPS5739678A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP11522580A JPS5739678A (en) 1980-08-20 1980-08-20 Detection circuit for automatic gain control voltage

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP11522580A JPS5739678A (en) 1980-08-20 1980-08-20 Detection circuit for automatic gain control voltage

Publications (1)

Publication Number Publication Date
JPS5739678A true JPS5739678A (en) 1982-03-04

Family

ID=14657445

Family Applications (1)

Application Number Title Priority Date Filing Date
JP11522580A Pending JPS5739678A (en) 1980-08-20 1980-08-20 Detection circuit for automatic gain control voltage

Country Status (1)

Country Link
JP (1) JPS5739678A (en)

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