JPS55161415A - Tuner - Google Patents

Tuner

Info

Publication number
JPS55161415A
JPS55161415A JP6753079A JP6753079A JPS55161415A JP S55161415 A JPS55161415 A JP S55161415A JP 6753079 A JP6753079 A JP 6753079A JP 6753079 A JP6753079 A JP 6753079A JP S55161415 A JPS55161415 A JP S55161415A
Authority
JP
Japan
Prior art keywords
oscillator
frequency
circuit
pll circuit
afc
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
JP6753079A
Other languages
Japanese (ja)
Inventor
Takeshi Saito
Toshio Nagashima
Hiroshi Hatashita
Susumu Yamamoto
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.)
Hitachi Ltd
Original Assignee
Hitachi 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 Hitachi Ltd filed Critical Hitachi Ltd
Priority to JP6753079A priority Critical patent/JPS55161415A/en
Publication of JPS55161415A publication Critical patent/JPS55161415A/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

Abstract

PURPOSE:To make it possible to adjust finely the receiving frequency of the tuner, which has the first and the second mixers, without fine adjustment of the offset frequency of the PLL circuit, by using the PLL circuit for fine adjustment and an AFC circuit commonly. CONSTITUTION:The output of video intermediate frequency amplifier 12 generates an AFC signal by AFC circuit 14 including a phase detecting circuit, and this signal is given to the second local oscillator 9 to adjust finely the oscillation frequency. The difference between frequencies of the first variable local oscillator 8 and the second local oscillator 9 is taken out by the third mixer 10 and is changed to the frequency control signal of oscillator 8 by PLL circuit 11, and the oscillation frequency of oscillator 8 is controlled to select a channel. By this constitution, the frequency of oscillator 8 is controlled by PLL circuit 11 on a basis of the difference between frequencies of oscillator 8 and oscillator 9, and the frequency control signal obtained from video intermediate frequency amplifier 12 through phase detecting circuit 14 is given to oscillator 9, thus adjusting the frequency finely.
JP6753079A 1979-06-01 1979-06-01 Tuner Pending JPS55161415A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP6753079A JPS55161415A (en) 1979-06-01 1979-06-01 Tuner

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP6753079A JPS55161415A (en) 1979-06-01 1979-06-01 Tuner

Publications (1)

Publication Number Publication Date
JPS55161415A true JPS55161415A (en) 1980-12-16

Family

ID=13347617

Family Applications (1)

Application Number Title Priority Date Filing Date
JP6753079A Pending JPS55161415A (en) 1979-06-01 1979-06-01 Tuner

Country Status (1)

Country Link
JP (1) JPS55161415A (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5388125A (en) * 1991-08-12 1995-02-07 Fujitsu Limited Frequency converter circuit with improved intermediate frequency stability

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5388125A (en) * 1991-08-12 1995-02-07 Fujitsu Limited Frequency converter circuit with improved intermediate frequency stability

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