JPS57201379A - Video synchronization detecting device - Google Patents

Video synchronization detecting device

Info

Publication number
JPS57201379A
JPS57201379A JP8490581A JP8490581A JPS57201379A JP S57201379 A JPS57201379 A JP S57201379A JP 8490581 A JP8490581 A JP 8490581A JP 8490581 A JP8490581 A JP 8490581A JP S57201379 A JPS57201379 A JP S57201379A
Authority
JP
Japan
Prior art keywords
circuit
signal
video
supplied
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
JP8490581A
Other languages
Japanese (ja)
Inventor
Kanji Oda
Yoshihisa Tomikawa
Tomoharu Genba
Yoshitaka Fujii
Hiroshi Miyazawa
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.)
Toshiba Corp
Japan Broadcasting Corp
Original Assignee
Toshiba Corp
Nippon Hoso Kyokai NHK
Tokyo Shibaura Electric Co Ltd
Japan Broadcasting 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 Toshiba Corp, Nippon Hoso Kyokai NHK, Tokyo Shibaura Electric Co Ltd, Japan Broadcasting Corp filed Critical Toshiba Corp
Priority to JP8490581A priority Critical patent/JPS57201379A/en
Publication of JPS57201379A publication Critical patent/JPS57201379A/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
    • H04N5/455—Demodulation-circuits

Landscapes

  • Engineering & Computer Science (AREA)
  • Multimedia (AREA)
  • Signal Processing (AREA)

Abstract

PURPOSE:To execute a phase detecting operation correctly and exactly, by suppressing the local oscillating jitters by a video carrier signal and an output signal of a video intermediate frequency amplifying stage, and detecting its output signal by a synchronization detecting circuit. CONSTITUTION:A TV signal received by an antenna 1 is supplied to a tuner 2, and a video intermediate frequency signal outputted from the tuner 2 is supplied to a mixing circuit 7 through an intermediate frequency amplifying stage 4. On the other hand, an output of the tuner 2 is supplied to a mixing circuit 8, too, is frequency converted by the circuit 8, and is supplied to a narrow band BPF10. In the BPF10, only a video carrier signal is extracted from an output signal of the circuit 8. This carrier signal is shaped as to its waveform in a limiting circuit 11 and is supplied to the circuit 7. Accordingly, in the circuit 7, the video carrier signal which has been frequency-converted and extracted is added to the video intermediate frequency signal, and it is frequency-converted. By utilizing an output of this circuit 7, the detection is executed by a synchronization detecting circuit 12, and a demodulated video signal is obtained in the output side of its circuit 12.
JP8490581A 1981-06-04 1981-06-04 Video synchronization detecting device Pending JPS57201379A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP8490581A JPS57201379A (en) 1981-06-04 1981-06-04 Video synchronization detecting device

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP8490581A JPS57201379A (en) 1981-06-04 1981-06-04 Video synchronization detecting device

Publications (1)

Publication Number Publication Date
JPS57201379A true JPS57201379A (en) 1982-12-09

Family

ID=13843745

Family Applications (1)

Application Number Title Priority Date Filing Date
JP8490581A Pending JPS57201379A (en) 1981-06-04 1981-06-04 Video synchronization detecting device

Country Status (1)

Country Link
JP (1) JPS57201379A (en)

Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5253652A (en) * 1975-10-28 1977-04-30 Sony Corp Receiver

Patent Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5253652A (en) * 1975-10-28 1977-04-30 Sony Corp Receiver

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