JPS5465418A - Keyed agc circuit - Google Patents

Keyed agc circuit

Info

Publication number
JPS5465418A
JPS5465418A JP13223377A JP13223377A JPS5465418A JP S5465418 A JPS5465418 A JP S5465418A JP 13223377 A JP13223377 A JP 13223377A JP 13223377 A JP13223377 A JP 13223377A JP S5465418 A JPS5465418 A JP S5465418A
Authority
JP
Japan
Prior art keywords
signal
agc control
control voltage
pulse
guard
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
JP13223377A
Other languages
Japanese (ja)
Inventor
Shogo Furuya
Naohisa Mochizuki
Harumitsu Shimizu
Takuo Fudanotsuji
Goro Izumi
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.)
Oki Electric Industry Co Ltd
Tamura Electric Works Ltd
NTT Inc
Original Assignee
Nippon Telegraph and Telephone Corp
Oki Electric Industry Co Ltd
Tamura Electric Works 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 Nippon Telegraph and Telephone Corp, Oki Electric Industry Co Ltd, Tamura Electric Works Ltd filed Critical Nippon Telegraph and Telephone Corp
Priority to JP13223377A priority Critical patent/JPS5465418A/en
Publication of JPS5465418A publication Critical patent/JPS5465418A/en
Pending legal-status Critical Current

Links

Classifications

    • H—ELECTRICITY
    • H03—ELECTRONIC CIRCUITRY
    • H03G—CONTROL OF AMPLIFICATION
    • H03G3/00—Gain control in amplifiers or frequency changers

Landscapes

  • Facsimile Image Signal Circuits (AREA)
  • Control Of Amplification And Gain Control (AREA)
  • Circuits Of Receivers In General (AREA)

Abstract

PURPOSE:To prevent the deterioration the received picture quality caused by the noise piled on the phase signal by generating the pulse synchronized with the guard signal in the facsimile receiver or the like and then setting the AGC control voltage with every frame. CONSTITUTION:Pulse signal generator circuit 6 which delivers synchronized pulse signal Gd is provided at the front edge of guard signal G which is produced in synchronization with phase signal f. Then the smoothing capacitor, which is holding the AGC control voltage within AGC control part 3, is discharged by signal Gd. After this, the phase signal is charged to the smoothing capacitor only while the guard signal is being generated. As a result, the AGC control voltage can be set with every frame.
JP13223377A 1977-11-04 1977-11-04 Keyed agc circuit Pending JPS5465418A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP13223377A JPS5465418A (en) 1977-11-04 1977-11-04 Keyed agc circuit

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP13223377A JPS5465418A (en) 1977-11-04 1977-11-04 Keyed agc circuit

Publications (1)

Publication Number Publication Date
JPS5465418A true JPS5465418A (en) 1979-05-26

Family

ID=15076474

Family Applications (1)

Application Number Title Priority Date Filing Date
JP13223377A Pending JPS5465418A (en) 1977-11-04 1977-11-04 Keyed agc circuit

Country Status (1)

Country Link
JP (1) JPS5465418A (en)

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5660165A (en) * 1979-10-20 1981-05-23 Canon Inc Picture reader
JPS56116364A (en) * 1980-02-19 1981-09-12 Fuji Xerox Co Ltd Processor for facsimile video signal
JPS5816973U (en) * 1981-07-24 1983-02-02 株式会社東芝 contrast correction circuit

Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5119616B2 (en) * 1971-11-25 1976-06-18

Patent Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5119616B2 (en) * 1971-11-25 1976-06-18

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5660165A (en) * 1979-10-20 1981-05-23 Canon Inc Picture reader
JPS56116364A (en) * 1980-02-19 1981-09-12 Fuji Xerox Co Ltd Processor for facsimile video signal
JPS5816973U (en) * 1981-07-24 1983-02-02 株式会社東芝 contrast correction circuit

Similar Documents

Publication Publication Date Title
ES387326A1 (en) Slicing synchronizing pulse separator circuit
HK53989A (en) Horizontal deflection circuit
JPS5465418A (en) Keyed agc circuit
JPS55166391A (en) Television picture receiver
JPS55107388A (en) Synchronizing signal separation system
SE8100089L (en) GENERATOR FOR COMPOSED KEY SIGNAL FOR A TELEVISION RECEIVER
JPS54124633A (en) Display circuit of television receiver
ES8303864A1 (en) Circuit arrangement for deriving a field synchronizing signal from an incoming signal
JPS53114309A (en) Receiver
JPS5363807A (en) Direct current component regenerator of television receiver
JPS52127029A (en) Tv signal processor
JPS5396604A (en) Display unit for synchronous status
JPS53117925A (en) Frequency control circuit
JPS5387102A (en) Adjustment system for pulse duty
JPS5570130A (en) Saw-tooth wave generator circuit
JPS5387101A (en) Adjustment system for pulse duty
JPS5251814A (en) Synchronizing separation circuit
JPS52140228A (en) Power source unit for tv picture receiver
JPS55162680A (en) Gate pulse generator
JPS52120664A (en) Synchronous type delay differentiation circuit
JPS5635572A (en) Vertical blanking pulse generating circuit
JPS5264218A (en) Synchronous signal generator of color tv camera
JPS5430029A (en) Automatic focal point dethctor
JPS53108717A (en) Auotmatic color synchronizing adjustment system
JPS5426653A (en) Phase synchronism circuit