JPS579123A - Malfunction preventing circuit for automatic fine tuning superposition - Google Patents

Malfunction preventing circuit for automatic fine tuning superposition

Info

Publication number
JPS579123A
JPS579123A JP8213880A JP8213880A JPS579123A JP S579123 A JPS579123 A JP S579123A JP 8213880 A JP8213880 A JP 8213880A JP 8213880 A JP8213880 A JP 8213880A JP S579123 A JPS579123 A JP S579123A
Authority
JP
Japan
Prior art keywords
signal
fine tuning
automatic fine
channel selection
superposition
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
JP8213880A
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 JP8213880A priority Critical patent/JPS579123A/en
Publication of JPS579123A publication Critical patent/JPS579123A/en
Pending legal-status Critical Current

Links

Classifications

    • H—ELECTRICITY
    • H03—ELECTRONIC CIRCUITRY
    • H03J—TUNING RESONANT CIRCUITS; SELECTING RESONANT CIRCUITS
    • H03J7/00—Automatic frequency control; Automatic scanning over a band of frequencies
    • H03J7/02—Automatic frequency control

Landscapes

  • Television Receiver Circuits (AREA)
  • Channel Selection Circuits, Automatic Tuning Circuits (AREA)

Abstract

PURPOSE:To keep the frequency within a given range at all times and to avoid malfunction, by taking channel selection and broadcast detection signals as control signal, and shortening the signal terminal after the completion of automatic fine tuning superposition operation. CONSTITUTION:A voice erasing signal or channel selection signal inputted from a terminal 41 is integrated at an integral network consisting of a diode 42, resistor 43 and capacitor 44, and the waveform is adjusted by an amplifier 45. This integration signal continues until the automatic fine tuning superposing operation is completed after the channel selection. By inputting this signal and a signal of the synchronizing signal detection circuit 49 to detect the broadcast signal to a NOR circuit 48, an FET53 is turned off until the automatic fine tuning superpmposing operation is completed after the channel selection.
JP8213880A 1980-06-19 1980-06-19 Malfunction preventing circuit for automatic fine tuning superposition Pending JPS579123A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP8213880A JPS579123A (en) 1980-06-19 1980-06-19 Malfunction preventing circuit for automatic fine tuning superposition

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP8213880A JPS579123A (en) 1980-06-19 1980-06-19 Malfunction preventing circuit for automatic fine tuning superposition

Publications (1)

Publication Number Publication Date
JPS579123A true JPS579123A (en) 1982-01-18

Family

ID=13766052

Family Applications (1)

Application Number Title Priority Date Filing Date
JP8213880A Pending JPS579123A (en) 1980-06-19 1980-06-19 Malfunction preventing circuit for automatic fine tuning superposition

Country Status (1)

Country Link
JP (1) JPS579123A (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS6412612A (en) * 1987-07-06 1989-01-17 Seiko Epson Corp Automatic channel selection circuit for television set

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS6412612A (en) * 1987-07-06 1989-01-17 Seiko Epson Corp Automatic channel selection circuit for television set

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