JPS5658373A - Afc circuit for television receiver - Google Patents

Afc circuit for television receiver

Info

Publication number
JPS5658373A
JPS5658373A JP13482679A JP13482679A JPS5658373A JP S5658373 A JPS5658373 A JP S5658373A JP 13482679 A JP13482679 A JP 13482679A JP 13482679 A JP13482679 A JP 13482679A JP S5658373 A JPS5658373 A JP S5658373A
Authority
JP
Japan
Prior art keywords
circuit
signal
fed
comparison signal
afc
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
JP13482679A
Other languages
Japanese (ja)
Inventor
Yuzo Yamamoto
Shinya Okuno
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.)
Sanyo Electric Co Ltd
Original Assignee
Sanyo Electric 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 Sanyo Electric Co Ltd filed Critical Sanyo Electric Co Ltd
Priority to JP13482679A priority Critical patent/JPS5658373A/en
Publication of JPS5658373A publication Critical patent/JPS5658373A/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 jitter of 15Hz or lower frequency components and to suppress fluctuation of reproduced picture, by suitably increasing the loop gain of an AFC circuit according to the degree of production of jitter components from VTRs. CONSTITUTION:An AFC circuit 1 consists of a phase detection circuit 2, integration circuit 3, and horizontal oscillation circuit 4. Diodes 21, 22 of the phase detection circuit 2 are mutually connected at the cathodes, and a synchronizing signal 12 fed to a connecting point 25 is fed to resistors 23, 24 with two split way. Further, the anode of the diode 21 is connected to the integrating circuit 3, and the horizontal oscillation output is converted into a saw tooth wave signal and fed as a comparison signal 11. The signal difference between the synchronizing signal 11 and the comparison signal 11 is output to the integrating circuit 3, and the time constant of an integrating circuit 26 is changed with switching of a selector switch 27 to change the amplitude of the comparison signal, allowing to increase the sensitivity of detection.
JP13482679A 1979-10-17 1979-10-17 Afc circuit for television receiver Pending JPS5658373A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP13482679A JPS5658373A (en) 1979-10-17 1979-10-17 Afc circuit for television receiver

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP13482679A JPS5658373A (en) 1979-10-17 1979-10-17 Afc circuit for television receiver

Publications (1)

Publication Number Publication Date
JPS5658373A true JPS5658373A (en) 1981-05-21

Family

ID=15137371

Family Applications (1)

Application Number Title Priority Date Filing Date
JP13482679A Pending JPS5658373A (en) 1979-10-17 1979-10-17 Afc circuit for television receiver

Country Status (1)

Country Link
JP (1) JPS5658373A (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4942472A (en) * 1988-01-04 1990-07-17 Sgs-Thomson Microelectronics S.A. Detection circuit for a video tape recorder signal

Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5019319A (en) * 1973-06-20 1975-02-28

Patent Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5019319A (en) * 1973-06-20 1975-02-28

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4942472A (en) * 1988-01-04 1990-07-17 Sgs-Thomson Microelectronics S.A. Detection circuit for a video tape recorder signal

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