JPS57136879A - Aft circuit - Google Patents

Aft circuit

Info

Publication number
JPS57136879A
JPS57136879A JP56022534A JP2253481A JPS57136879A JP S57136879 A JPS57136879 A JP S57136879A JP 56022534 A JP56022534 A JP 56022534A JP 2253481 A JP2253481 A JP 2253481A JP S57136879 A JPS57136879 A JP S57136879A
Authority
JP
Japan
Prior art keywords
circuit
signal
frequency
aft voltage
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
JP56022534A
Other languages
Japanese (ja)
Inventor
Hisao Mogi
Koji Morita
Osamu Matsunaga
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.)
Sony Corp
Original Assignee
Sony Corp
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 Sony Corp filed Critical Sony Corp
Priority to JP56022534A priority Critical patent/JPS57136879A/en
Priority to GB8204478A priority patent/GB2094080B/en
Priority to CA000396345A priority patent/CA1170354A/en
Priority to US06/349,651 priority patent/US4439787A/en
Priority to DE19823205835 priority patent/DE3205835A1/en
Priority to NL8200651A priority patent/NL8200651A/en
Priority to FR8202708A priority patent/FR2500249B1/fr
Publication of JPS57136879A publication Critical patent/JPS57136879A/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
    • 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)
  • Television Receiver Circuits (AREA)

Abstract

PURPOSE:To improve AFT operation, by giving priority to an AFT voltage among signals controlling a local oscillator circuit and controlling up and down of a local oscillator frequency through the presence of a synchronizing signal when no AFT voltage is used. CONSTITUTION:A signal from a tuner 1 is applied to a VIF circuit 2, detection circuit 3, synchronizing separation circuit 4 for normal TV reception. An AFT voltage is picked up from the circuit 2 through a frequency discrimination circuit 5 and applied to a discrimination circuit 6. A signal discriminating the presence of a synchronizing signal is picked up from the circuit 4 via a discriminating circuit 7 and applied to the circuit 6. Depending on the AFT voltage is above or below the specified value, the frequency is increased or decreased by the circuit 6, and if no AFT voltage is present, a signal increasing or decreasing the frequency through the presence of the synchronizing signal is formed. A signal from the circuit 6 is applied to a control circuit 8 for a PWM generating circuit.
JP56022534A 1981-02-18 1981-02-18 Aft circuit Pending JPS57136879A (en)

Priority Applications (7)

Application Number Priority Date Filing Date Title
JP56022534A JPS57136879A (en) 1981-02-18 1981-02-18 Aft circuit
GB8204478A GB2094080B (en) 1981-02-18 1982-02-16 Automatic fine tuning circuits for television receivers
CA000396345A CA1170354A (en) 1981-02-18 1982-02-16 Aft circuit
US06/349,651 US4439787A (en) 1981-02-18 1982-02-17 AFT Circuit
DE19823205835 DE3205835A1 (en) 1981-02-18 1982-02-18 METHOD AND TUNING CIRCUIT FOR AUTOMATICALLY ADJUSTING THE TUNING OF AN OVERLAY TUNING LEVEL OF A TELEVISION RECEIVER
NL8200651A NL8200651A (en) 1981-02-18 1982-02-18 AUTOMATIC FINE TUNING.
FR8202708A FR2500249B1 (en) 1981-02-18 1982-02-18

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP56022534A JPS57136879A (en) 1981-02-18 1981-02-18 Aft circuit

Publications (1)

Publication Number Publication Date
JPS57136879A true JPS57136879A (en) 1982-08-24

Family

ID=12085460

Family Applications (1)

Application Number Title Priority Date Filing Date
JP56022534A Pending JPS57136879A (en) 1981-02-18 1981-02-18 Aft circuit

Country Status (1)

Country Link
JP (1) JPS57136879A (en)

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