JPS5730467A - Automatic switching device of multiple-system color television receiver - Google Patents

Automatic switching device of multiple-system color television receiver

Info

Publication number
JPS5730467A
JPS5730467A JP10358380A JP10358380A JPS5730467A JP S5730467 A JPS5730467 A JP S5730467A JP 10358380 A JP10358380 A JP 10358380A JP 10358380 A JP10358380 A JP 10358380A JP S5730467 A JPS5730467 A JP S5730467A
Authority
JP
Japan
Prior art keywords
horizontal
oscillating circuit
signals
inputted
circuit
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
JP10358380A
Other languages
Japanese (ja)
Inventor
Akihiro Harasawa
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 JP10358380A priority Critical patent/JPS5730467A/en
Publication of JPS5730467A publication Critical patent/JPS5730467A/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)
  • Details Of Television Scanning (AREA)

Abstract

PURPOSE:To receive TV signals of the B/PAL and M/NTS systems with simple circuit constitution, by switching horizontal frequencies of a horizontal oscillating circuit by a detection signal obtained by detecting output amplitude variations of a vertical oscillating circuit due to a difference in field frequency. CONSTITUTION:To a vertical oscillating circuit 1, the 1st and 2nd different vertical synchronizing signals for B/PAL system reception and M/NTSC system reception are inputted, and the 1st and 2nd saw-tooth waves which correspond to those synchronizing signals are outputted. The peak value of each saw-tooth wave is rectified by a peak rectifying circuit 2, whose peak rectification output is applied to a Zener diode 3. This diode 3 turns on when the rectification output exceeds some constant voltage, and the output of the diode 3 is inputted to a switch circuit 4, which outputs a signal different in level. This different level is inputted to a horizontal oscillating circuit inputting a horizontal synchronizing signal to switch horizontal oscillation frequencies automatically, thus receiving TV signals of the B/PAL and M/NTSC systems.
JP10358380A 1980-07-30 1980-07-30 Automatic switching device of multiple-system color television receiver Pending JPS5730467A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP10358380A JPS5730467A (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
JP10358380A JPS5730467A (en) 1980-07-30 1980-07-30 Automatic switching device of multiple-system color television receiver

Publications (1)

Publication Number Publication Date
JPS5730467A true JPS5730467A (en) 1982-02-18

Family

ID=14357793

Family Applications (1)

Application Number Title Priority Date Filing Date
JP10358380A Pending JPS5730467A (en) 1980-07-30 1980-07-30 Automatic switching device of multiple-system color television receiver

Country Status (1)

Country Link
JP (1) JPS5730467A (en)

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