JPS5526777A - Television video intermediate frequency amplifier system - Google Patents

Television video intermediate frequency amplifier system

Info

Publication number
JPS5526777A
JPS5526777A JP10023178A JP10023178A JPS5526777A JP S5526777 A JPS5526777 A JP S5526777A JP 10023178 A JP10023178 A JP 10023178A JP 10023178 A JP10023178 A JP 10023178A JP S5526777 A JPS5526777 A JP S5526777A
Authority
JP
Japan
Prior art keywords
circuit
agc
signal
intermediate frequency
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
JP10023178A
Other languages
Japanese (ja)
Inventor
Hajime Takano
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.)
Mitsubishi Electric Corp
Original Assignee
Mitsubishi Electric 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 Mitsubishi Electric Corp filed Critical Mitsubishi Electric Corp
Priority to JP10023178A priority Critical patent/JPS5526777A/en
Publication of JPS5526777A publication Critical patent/JPS5526777A/en
Pending legal-status Critical Current

Links

Abstract

PURPOSE: To prevent a latch-up phenomenon by providing a control circuit switching an AGC circuit by extracting a synchronizing signal or chroma burst signal from the output of a video synchronous detection circuit.
CONSTITUTION: From the output of video synchronous detection circuit 19, a synchronizing signal or chroma burst signal is generated 24 and outputted to terminal 26. This output signal is detected and rectified by control circuit 25 to control intermediate frequency AGC circuit 20 according to the existence or amplitude of this signal. Then, control circuit 25 is provided with a keying circuit which interrupts the control over AGC at the point in time when a video detection output appears with a normal value and in a normal shape, exerting no influence upon the operation. Consequently, abnormal operation and a latch-up phenomenon due to the large momentary input to the AGC system of RF.AGC circuit 21 and IF.AGC circuit 20 can be prevented without influencing high frequency characteristics of video intermediate frequency amplifier 18 and synchronous detection circuit 19.
COPYRIGHT: (C)1980,JPO&Japio
JP10023178A 1978-08-16 1978-08-16 Television video intermediate frequency amplifier system Pending JPS5526777A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP10023178A JPS5526777A (en) 1978-08-16 1978-08-16 Television video intermediate frequency amplifier system

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP10023178A JPS5526777A (en) 1978-08-16 1978-08-16 Television video intermediate frequency amplifier system

Publications (1)

Publication Number Publication Date
JPS5526777A true JPS5526777A (en) 1980-02-26

Family

ID=14268491

Family Applications (1)

Application Number Title Priority Date Filing Date
JP10023178A Pending JPS5526777A (en) 1978-08-16 1978-08-16 Television video intermediate frequency amplifier system

Country Status (1)

Country Link
JP (1) JPS5526777A (en)

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