JPS56132017A - Electronic channel selection tuning circuit - Google Patents

Electronic channel selection tuning circuit

Info

Publication number
JPS56132017A
JPS56132017A JP3475680A JP3475680A JPS56132017A JP S56132017 A JPS56132017 A JP S56132017A JP 3475680 A JP3475680 A JP 3475680A JP 3475680 A JP3475680 A JP 3475680A JP S56132017 A JPS56132017 A JP S56132017A
Authority
JP
Japan
Prior art keywords
synchronizing signal
turned
input signal
signal
trq4
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.)
Granted
Application number
JP3475680A
Other languages
Japanese (ja)
Other versions
JPS6126850B2 (en
Inventor
Masahiro Fujita
Yoshito Chikura
Tatsuaki Sato
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 JP3475680A priority Critical patent/JPS56132017A/en
Publication of JPS56132017A publication Critical patent/JPS56132017A/en
Publication of JPS6126850B2 publication Critical patent/JPS6126850B2/ja
Granted 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
    • H03J7/18—Automatic scanning over a band of frequencies
    • H03J7/20—Automatic scanning over a band of frequencies where the scanning is accomplished by varying the electrical characteristics of a non-mechanically adjustable element
    • H03J7/28—Automatic scanning over a band of frequencies where the scanning is accomplished by varying the electrical characteristics of a non-mechanically adjustable element using counters or frequency dividers

Landscapes

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

Abstract

PURPOSE:To make stable receiving possible, by holding the frequency control signal in the state before the time below during the time when detection of the synchronizing signal is broken because of a high input signal level. CONSTITUTION:When synchronizing signal detecting circuit 12 detects the synchronizing signal included in the input signal, the sweep counter generating the automatic tuning voltage is controlled to perform tuning automatically. Meanwhile, if the input signal is excessive, the synchronizing signal is not detected, and the synchronizing signal lack period is generated. During this period, since transistors TRQ1 and Q2 are turned off, diode D5 is turned on, and a current is flowed through the emitter and the base of TRQ4, resistance R0, and diode D5, and the potential of output terminal P4 is lowered though TRQ4 is turned off, and thus, the sweep counter is not operated to hold stable receiving.
JP3475680A 1980-03-21 1980-03-21 Electronic channel selection tuning circuit Granted JPS56132017A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP3475680A JPS56132017A (en) 1980-03-21 1980-03-21 Electronic channel selection tuning circuit

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP3475680A JPS56132017A (en) 1980-03-21 1980-03-21 Electronic channel selection tuning circuit

Publications (2)

Publication Number Publication Date
JPS56132017A true JPS56132017A (en) 1981-10-16
JPS6126850B2 JPS6126850B2 (en) 1986-06-23

Family

ID=12423153

Family Applications (1)

Application Number Title Priority Date Filing Date
JP3475680A Granted JPS56132017A (en) 1980-03-21 1980-03-21 Electronic channel selection tuning circuit

Country Status (1)

Country Link
JP (1) JPS56132017A (en)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS60235593A (en) * 1984-05-08 1985-11-22 Casio Comput Co Ltd Panel type television receiver
JPS62154982A (en) * 1985-12-27 1987-07-09 Pioneer Electronic Corp Television signal receiver

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS60235593A (en) * 1984-05-08 1985-11-22 Casio Comput Co Ltd Panel type television receiver
JPS62154982A (en) * 1985-12-27 1987-07-09 Pioneer Electronic Corp Television signal receiver

Also Published As

Publication number Publication date
JPS6126850B2 (en) 1986-06-23

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