JPS5648712A - Pll frequency synthesizer receiver - Google Patents

Pll frequency synthesizer receiver

Info

Publication number
JPS5648712A
JPS5648712A JP12579479A JP12579479A JPS5648712A JP S5648712 A JPS5648712 A JP S5648712A JP 12579479 A JP12579479 A JP 12579479A JP 12579479 A JP12579479 A JP 12579479A JP S5648712 A JPS5648712 A JP S5648712A
Authority
JP
Japan
Prior art keywords
frequency
aft
detection output
reference frequency
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
JP12579479A
Other languages
Japanese (ja)
Inventor
Takao Ikegami
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.)
Sharp Corp
Original Assignee
Sharp 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 Sharp Corp filed Critical Sharp Corp
Priority to JP12579479A priority Critical patent/JPS5648712A/en
Priority to ES489331A priority patent/ES489331A0/en
Publication of JPS5648712A publication Critical patent/JPS5648712A/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
    • H03J7/04—Automatic frequency control where the frequency control is accomplished by varying the electrical characteristics of a non-mechanically adjustable element or where the nature of the frequency controlling element is not significant
    • H03J7/06—Automatic frequency control where the frequency control is accomplished by varying the electrical characteristics of a non-mechanically adjustable element or where the nature of the frequency controlling element is not significant using counters or frequency dividers
    • H03J7/065—Automatic frequency control where the frequency control is accomplished by varying the electrical characteristics of a non-mechanically adjustable element or where the nature of the frequency controlling element is not significant using counters or frequency dividers the counter or frequency divider being used in a phase locked loop

Landscapes

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

Abstract

PURPOSE:To perform accurate reception by applying the detection output of an AFT detecting circuit to a reference frequency oscillating circuit, by varying a reference frequency on the basis of the detection output and by making it possible to vary a local oscillation frequency continuously. CONSTITUTION:An intermediate frequency signal obtained by video intermediate frequency circuit 5 is AFT-detected by AFT detecting circuit 16, whose detection output is applied to reference frequency oscillating circuit 14. A reference frequency at which this oscillating circuit 14 oscillates is finely adjusted on the basis of the AFT detection output. In this case, the reference frequency of oscillating circuit 14 is varied according to the AFT detection output to vary the reference frequency applied to phase comparing circuit 13, and consequently the PLL synthesizer loop is brought under external control, so that the value of a local oscillation frequency at which local oscillating circuit 4 oscillates will not be stepped, but be continuous. Thus, the residual frequency in the loop can be made zero at any time, so that the PLL frequency synthesizer receiver will provide more accurate reception.
JP12579479A 1979-09-28 1979-09-28 Pll frequency synthesizer receiver Pending JPS5648712A (en)

Priority Applications (2)

Application Number Priority Date Filing Date Title
JP12579479A JPS5648712A (en) 1979-09-28 1979-09-28 Pll frequency synthesizer receiver
ES489331A ES489331A0 (en) 1979-09-28 1980-03-07 IMPROVEMENT IN TELEVISION RECEIVERS WITH FREQUENCY SYNTHESIS-DOR.

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP12579479A JPS5648712A (en) 1979-09-28 1979-09-28 Pll frequency synthesizer receiver

Publications (1)

Publication Number Publication Date
JPS5648712A true JPS5648712A (en) 1981-05-02

Family

ID=14919033

Family Applications (1)

Application Number Title Priority Date Filing Date
JP12579479A Pending JPS5648712A (en) 1979-09-28 1979-09-28 Pll frequency synthesizer receiver

Country Status (2)

Country Link
JP (1) JPS5648712A (en)
ES (1) ES489331A0 (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4731871A (en) * 1985-11-18 1988-03-15 Casio Computer Co., Ltd. Tuning device for liquid crystal television

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4731871A (en) * 1985-11-18 1988-03-15 Casio Computer Co., Ltd. Tuning device for liquid crystal television

Also Published As

Publication number Publication date
ES8105544A1 (en) 1981-05-16
ES489331A0 (en) 1981-05-16

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