JPS5634281A - Electronic channel selection unit - Google Patents

Electronic channel selection unit

Info

Publication number
JPS5634281A
JPS5634281A JP11004979A JP11004979A JPS5634281A JP S5634281 A JPS5634281 A JP S5634281A JP 11004979 A JP11004979 A JP 11004979A JP 11004979 A JP11004979 A JP 11004979A JP S5634281 A JPS5634281 A JP S5634281A
Authority
JP
Japan
Prior art keywords
signal
output
detected
sweep
aft
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
JP11004979A
Other languages
Japanese (ja)
Inventor
Masahiro Fujita
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
Original Assignee
Toshiba Corp
Tokyo Shibaura 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 Toshiba Corp, Tokyo Shibaura Electric Co Ltd filed Critical Toshiba Corp
Priority to JP11004979A priority Critical patent/JPS5634281A/en
Publication of JPS5634281A publication Critical patent/JPS5634281A/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
    • H04N5/50—Tuning indicators; Automatic tuning control

Landscapes

  • Engineering & Computer Science (AREA)
  • Multimedia (AREA)
  • Signal Processing (AREA)
  • Channel Selection Circuits, Automatic Tuning Circuits (AREA)

Abstract

PURPOSE:To make it possible to make the preset operation more accurate, by stopping the AGT signal, which is obtained by detecting the intermediate frequency, to prevent the erroneous signal dependent upon noise and so on from being output, in respect to preset fo the selection channel. CONSTITUTION:When the sweep switch is depressed, the count value of the sweep counter of the unit starts rising, and the tuning voltage starts rising according to rise of the count value above. Then, the TV receiver starts frequency sweep, however, AND gate circuit 65 is non-conductive as long as the synchronizing signal is not detected by period detecting and rectifying circuit 70. Consequently, as long as the synchronizing signal is not detected, the output is stopped by AND gate circuit 65 even if the autofine tuning (AFT) signal obtained by detection of the intermediate frequency or the signal resembling this AFT signal is detected by waveform shaping circuit 63, so that an erroneous signal can be prevented from being output to stop signal output end 67 by noise and the sound signal.
JP11004979A 1979-08-29 1979-08-29 Electronic channel selection unit Pending JPS5634281A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP11004979A JPS5634281A (en) 1979-08-29 1979-08-29 Electronic channel selection unit

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP11004979A JPS5634281A (en) 1979-08-29 1979-08-29 Electronic channel selection unit

Publications (1)

Publication Number Publication Date
JPS5634281A true JPS5634281A (en) 1981-04-06

Family

ID=14525798

Family Applications (1)

Application Number Title Priority Date Filing Date
JP11004979A Pending JPS5634281A (en) 1979-08-29 1979-08-29 Electronic channel selection unit

Country Status (1)

Country Link
JP (1) JPS5634281A (en)

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