JPS56162526A - Tuning detector - Google Patents

Tuning detector

Info

Publication number
JPS56162526A
JPS56162526A JP6679980A JP6679980A JPS56162526A JP S56162526 A JPS56162526 A JP S56162526A JP 6679980 A JP6679980 A JP 6679980A JP 6679980 A JP6679980 A JP 6679980A JP S56162526 A JPS56162526 A JP S56162526A
Authority
JP
Japan
Prior art keywords
frequency
signal
detection
detector
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
JP6679980A
Other languages
Japanese (ja)
Inventor
Shunichi Nezu
Kiyotake Fukui
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.)
Panasonic Holdings Corp
Original Assignee
Matsushita Electric Industrial 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 Matsushita Electric Industrial Co Ltd filed Critical Matsushita Electric Industrial Co Ltd
Priority to JP6679980A priority Critical patent/JPS56162526A/en
Publication of JPS56162526A publication Critical patent/JPS56162526A/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

Landscapes

  • Engineering & Computer Science (AREA)
  • Computer Hardware Design (AREA)
  • Microelectronics & Electronic Packaging (AREA)
  • Channel Selection Circuits, Automatic Tuning Circuits (AREA)

Abstract

PURPOSE:To perform stable frequency detection with high resolution by detecting an IF digitally and by using a reference frequency signal in a synthesizer circuit as a reference signal for said frequency detection. CONSTITUTION:A frequency-division code outputted from a channel-selection control circuit 12 is supplied to a variable frequency-dividing circuit 7 and the oscillation frequency of a voltage-controlled oscillator 5 is decided by its frequency-division ratio. An IF signal, on the other hand, is inputted to a frequency detector 13 and one frequency-divided signal from a frequency divider 11 is used as a reference signal to detect whether it is at a prescribed frequency or not. The detection result of the detector 13 is inputted to the channel-selection control circuit 12 and used, for example, as a sweep stop signal for automatic tuning. As the detection reference signal of this detector 13, the frequency-divided signal of a frequency synthesizing circuit composed of a variable frequency divider 7, a phase comparator 8, an LPF9, a reference frequency oscillator 10, and the reference frequency divider 11 is used to perform high-resolution and stable tuning detection.
JP6679980A 1980-05-19 1980-05-19 Tuning detector Pending JPS56162526A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP6679980A JPS56162526A (en) 1980-05-19 1980-05-19 Tuning detector

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP6679980A JPS56162526A (en) 1980-05-19 1980-05-19 Tuning detector

Publications (1)

Publication Number Publication Date
JPS56162526A true JPS56162526A (en) 1981-12-14

Family

ID=13326270

Family Applications (1)

Application Number Title Priority Date Filing Date
JP6679980A Pending JPS56162526A (en) 1980-05-19 1980-05-19 Tuning detector

Country Status (1)

Country Link
JP (1) JPS56162526A (en)

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