JPS5639679A - Horizontal synchronizing afc circuit - Google Patents

Horizontal synchronizing afc circuit

Info

Publication number
JPS5639679A
JPS5639679A JP11351279A JP11351279A JPS5639679A JP S5639679 A JPS5639679 A JP S5639679A JP 11351279 A JP11351279 A JP 11351279A JP 11351279 A JP11351279 A JP 11351279A JP S5639679 A JPS5639679 A JP S5639679A
Authority
JP
Japan
Prior art keywords
waveform
horizontal synchronizing
resistance
fly
turns
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
JP11351279A
Other languages
Japanese (ja)
Inventor
Junichi Yamase
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.)
Hitachi Ltd
Original Assignee
Hitachi 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 Hitachi Ltd filed Critical Hitachi Ltd
Priority to JP11351279A priority Critical patent/JPS5639679A/en
Publication of JPS5639679A publication Critical patent/JPS5639679A/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
    • H04N5/04—Synchronising
    • H04N5/12—Devices in which the synchronising signals are only operative if a phase difference occurs between synchronising and synchronised scanning devices, e.g. flywheel synchronising

Landscapes

  • Engineering & Computer Science (AREA)
  • Multimedia (AREA)
  • Signal Processing (AREA)
  • Synchronizing For Television (AREA)

Abstract

PURPOSE:To eliminate a shift in TV screen between both L and E systems and also to reproduce a correct picture without providing a switching method, by providing an integrating circuit for fly-back pulses with a switching transistor and discharging resistance. CONSTITUTION:When a horizontal synchronizing signal is applied, switch 8 turns on to put differential amplifiers 1 and 2 into operation. Then when fly-back pulse F is applied to the base of transistor TR19 of the integrating circuit, capacitor C13 is charged from electric power source 11 by way of TR17 and resistance 18. As pulse F is ceased, the accumulated charge of C13 is discharged via resistance 19 because of TR17 turns off to obtain saw-tooth waveform (b) having the upper clipped and the waveform is applied to the base of amplifier 2 as a comparison waveform, so that the outputs of differential amplifiers will be supplied to horizontal oscillating circuit 15 via filter 14. In this case, a phase comparison to the horizontal synchronizing signal is made on the basis of the mean value of the saw-tooth waveform, so that no shift in screen between both E and L systems will be made.
JP11351279A 1979-09-06 1979-09-06 Horizontal synchronizing afc circuit Pending JPS5639679A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP11351279A JPS5639679A (en) 1979-09-06 1979-09-06 Horizontal synchronizing afc circuit

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP11351279A JPS5639679A (en) 1979-09-06 1979-09-06 Horizontal synchronizing afc circuit

Publications (1)

Publication Number Publication Date
JPS5639679A true JPS5639679A (en) 1981-04-15

Family

ID=14614208

Family Applications (1)

Application Number Title Priority Date Filing Date
JP11351279A Pending JPS5639679A (en) 1979-09-06 1979-09-06 Horizontal synchronizing afc circuit

Country Status (1)

Country Link
JP (1) JPS5639679A (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR19990018064A (en) * 1997-08-26 1999-03-15 윤종용 Horizontal Synchronization Signal Pulse Width Modulator in Image Display System

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR19990018064A (en) * 1997-08-26 1999-03-15 윤종용 Horizontal Synchronization Signal Pulse Width Modulator in Image Display System

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