JPS5730471A - Automatic switching device of multiple-system color television receiver - Google Patents

Automatic switching device of multiple-system color television receiver

Info

Publication number
JPS5730471A
JPS5730471A JP10358680A JP10358680A JPS5730471A JP S5730471 A JPS5730471 A JP S5730471A JP 10358680 A JP10358680 A JP 10358680A JP 10358680 A JP10358680 A JP 10358680A JP S5730471 A JPS5730471 A JP S5730471A
Authority
JP
Japan
Prior art keywords
circuit
signals
pal
video
diode
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
JP10358680A
Other languages
Japanese (ja)
Inventor
Satoshi Hatakeyama
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 JP10358680A priority Critical patent/JPS5730471A/en
Publication of JPS5730471A publication Critical patent/JPS5730471A/en
Pending legal-status Critical Current

Links

Classifications

    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
    • H04N9/00—Details of colour television systems
    • H04N9/64—Circuits for processing colour signals
    • H04N9/642—Multi-standard receivers

Landscapes

  • Engineering & Computer Science (AREA)
  • Multimedia (AREA)
  • Signal Processing (AREA)
  • Color Television Systems (AREA)

Abstract

PURPOSE:To receive TV signals of the ZB/PAL and M/NTSC systems with simple circuit constitution by switching a video IF resonant circuit automatically by a detection signal obtained by detecting the output amplitude variations of a vertical oscillating circuit due to a difference in field frequency. CONSTITUTION:The output of a vertical synchronism discriminating circuit, which inputs the 1st and 2nd vertical synchronizing signals of the B/PAL and M/NTSC systems and then outputs the 1st and 2nd level voltages synchronizing with those synchronizing signals, is inputted to the terminal E of a circuit switching video IF characteristics. This circuit is provided with a tuner 5, a resonant circuit 6, a video IF amplifier 7, and capacitors 8 and 9, an inductance 10, and a Zener diode 11 constituting a series trapping circuit. For B/PAL or M/NTSC system reception, the voltage at the terminal E is held at a prescribed level to turn on or off the diode 11. Then, the characteristics of the trapping circuit are switched by turning on or off the diode 11 to receive TV signals of both the systems.
JP10358680A 1980-07-30 1980-07-30 Automatic switching device of multiple-system color television receiver Pending JPS5730471A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP10358680A JPS5730471A (en) 1980-07-30 1980-07-30 Automatic switching device of multiple-system color television receiver

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP10358680A JPS5730471A (en) 1980-07-30 1980-07-30 Automatic switching device of multiple-system color television receiver

Publications (1)

Publication Number Publication Date
JPS5730471A true JPS5730471A (en) 1982-02-18

Family

ID=14357872

Family Applications (1)

Application Number Title Priority Date Filing Date
JP10358680A Pending JPS5730471A (en) 1980-07-30 1980-07-30 Automatic switching device of multiple-system color television receiver

Country Status (1)

Country Link
JP (1) JPS5730471A (en)

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