JPS5784629A - Channel selection circuit - Google Patents

Channel selection circuit

Info

Publication number
JPS5784629A
JPS5784629A JP55160296A JP16029680A JPS5784629A JP S5784629 A JPS5784629 A JP S5784629A JP 55160296 A JP55160296 A JP 55160296A JP 16029680 A JP16029680 A JP 16029680A JP S5784629 A JPS5784629 A JP S5784629A
Authority
JP
Japan
Prior art keywords
frequency
output
prescaler
channel selection
divider
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
JP55160296A
Other languages
Japanese (ja)
Inventor
Akira Yamakoshi
Yukio Tsuda
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 JP55160296A priority Critical patent/JPS5784629A/en
Publication of JPS5784629A publication Critical patent/JPS5784629A/en
Pending legal-status Critical Current

Links

Classifications

    • H—ELECTRICITY
    • H03—ELECTRONIC CIRCUITRY
    • H03J—TUNING RESONANT CIRCUITS; SELECTING RESONANT CIRCUITS
    • H03J1/00—Details of adjusting, driving, indicating, or mechanical control arrangements for resonant circuits in general
    • H03J1/0008—Details of adjusting, driving, indicating, or mechanical control arrangements for resonant circuits in general using a central processing unit, e.g. a microprocessor
    • H03J1/0041—Details of adjusting, driving, indicating, or mechanical control arrangements for resonant circuits in general using a central processing unit, e.g. a microprocessor for frequency synthesis with counters or frequency dividers
    • H03J1/005—Details of adjusting, driving, indicating, or mechanical control arrangements for resonant circuits in general using a central processing unit, e.g. a microprocessor for frequency synthesis with counters or frequency dividers in a loop

Abstract

PURPOSE:To avoid beat interference, by making the output frequency higher than the intermediate freuency at all times and making it lower than the operation-enable-frequency of a programable divider, through the change in the frequecy dividing ratio of a prescaler in a channel selection circuit of a PLL system. CONSTITUTION:TV broadcast electromagnetic waves are supplied to a tunning circuit 2 via an antenna 1, whereby they are mixed with the output of a local oscillator 3 to output an intermediate frequency signal from a terminal 9. An oscillation frequency f of the oscillator 3 is frequency-divided with a frequency ratio 1/k preset with a control signal from a control circuit 8a at a prescaler 4a, the output is supplied to a programmable divider 5 and frequency-divided at a frequency-dividing ratio 1/N preset from the control circuit 8a, the output is compared in terms of phase at a phase comparator 6 with a frequency fr of a reference frequency generator 7, and the output becomes the controlled voltage input of the oscillator 3. Taking the frequency dividing ratio of the divider 5 as 1/N=kfr/f , the output frequency of the prescaler 4a is higher than the intermediate frequency, the harmonic is lower than the channel selection frequency and the beat interference can be avoided.
JP55160296A 1980-11-14 1980-11-14 Channel selection circuit Pending JPS5784629A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP55160296A JPS5784629A (en) 1980-11-14 1980-11-14 Channel selection circuit

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP55160296A JPS5784629A (en) 1980-11-14 1980-11-14 Channel selection circuit

Publications (1)

Publication Number Publication Date
JPS5784629A true JPS5784629A (en) 1982-05-27

Family

ID=15711897

Family Applications (1)

Application Number Title Priority Date Filing Date
JP55160296A Pending JPS5784629A (en) 1980-11-14 1980-11-14 Channel selection circuit

Country Status (1)

Country Link
JP (1) JPS5784629A (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS62159030U (en) * 1986-03-31 1987-10-08

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS62159030U (en) * 1986-03-31 1987-10-08

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