JPS573438A - Synthesizer type channel selector - Google Patents

Synthesizer type channel selector

Info

Publication number
JPS573438A
JPS573438A JP7622180A JP7622180A JPS573438A JP S573438 A JPS573438 A JP S573438A JP 7622180 A JP7622180 A JP 7622180A JP 7622180 A JP7622180 A JP 7622180A JP S573438 A JPS573438 A JP S573438A
Authority
JP
Japan
Prior art keywords
frequency
output
loop
tuner
oscillator
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
JP7622180A
Other languages
Japanese (ja)
Inventor
Tomoyuki Yamaguchi
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.)
Fujitsu General Ltd
Gen Co Ltd
Original Assignee
Fujitsu General Ltd
Gen 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 Fujitsu General Ltd, Gen Co Ltd filed Critical Fujitsu General Ltd
Priority to JP7622180A priority Critical patent/JPS573438A/en
Publication of JPS573438A publication Critical patent/JPS573438A/en
Pending legal-status Critical Current

Links

Classifications

    • H—ELECTRICITY
    • H03—ELECTRONIC CIRCUITRY
    • H03L—AUTOMATIC CONTROL, STARTING, SYNCHRONISATION, OR STABILISATION OF GENERATORS OF ELECTRONIC OSCILLATIONS OR PULSES
    • H03L7/00—Automatic control of frequency or phase; Synchronisation
    • H03L7/06—Automatic control of frequency or phase; Synchronisation using a reference signal applied to a frequency- or phase-locked loop
    • H03L7/16—Indirect frequency synthesis, i.e. generating a desired one of a number of predetermined frequencies using a frequency- or phase-locked loop
    • H03L7/22—Indirect frequency synthesis, i.e. generating a desired one of a number of predetermined frequencies using a frequency- or phase-locked loop using more than one loop
    • H03L7/23—Indirect frequency synthesis, i.e. generating a desired one of a number of predetermined frequencies using a frequency- or phase-locked loop using more than one loop with pulse counters or frequency dividers

Abstract

PURPOSE:To make possible the fine tuning of a tuner with a simple constitution, by constituting two phase synchronized loops consisting of constituent elements, and obtaining the reference frequency of the other loop based on the oscillated output obtained from one loop. CONSTITUTION:An output from a reference oscillator 18 of the 2nd phase synchronized loop is changed to a required component via each constituent and applied to a voltage-controlled variable oscillator 14 of the same loop. Next a frequency divider 13 of the 1st phase synchronized loop frequency-divides the output from the oscillator 14 to output a reference frequency fr 1. The phase difference between the output of a frequency divider 10 frequency-dividing a local oscillating frequency fl of an electronic tuner 8 and the frequency fr 1 is outputted at a phase comparator 11. Next, this output is inputted to a low-pass filter 12 to make output as a tuning voltage at the tuner 8 through integration. Thus, fine tuning can be made without changing the fr 1 by changing the number of counts of the frequency divider 10 and determining the number of counts of the frequency dividers of each constituent element so that the step between stations can be changed.
JP7622180A 1980-06-06 1980-06-06 Synthesizer type channel selector Pending JPS573438A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP7622180A JPS573438A (en) 1980-06-06 1980-06-06 Synthesizer type channel selector

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP7622180A JPS573438A (en) 1980-06-06 1980-06-06 Synthesizer type channel selector

Publications (1)

Publication Number Publication Date
JPS573438A true JPS573438A (en) 1982-01-08

Family

ID=13599118

Family Applications (1)

Application Number Title Priority Date Filing Date
JP7622180A Pending JPS573438A (en) 1980-06-06 1980-06-06 Synthesizer type channel selector

Country Status (1)

Country Link
JP (1) JPS573438A (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO1995006359A1 (en) * 1993-08-27 1995-03-02 H.U.C. Elektronik Gmbh Pll system

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO1995006359A1 (en) * 1993-08-27 1995-03-02 H.U.C. Elektronik Gmbh Pll system

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