JPS55153421A - Counter for channel number - Google Patents

Counter for channel number

Info

Publication number
JPS55153421A
JPS55153421A JP6042779A JP6042779A JPS55153421A JP S55153421 A JPS55153421 A JP S55153421A JP 6042779 A JP6042779 A JP 6042779A JP 6042779 A JP6042779 A JP 6042779A JP S55153421 A JPS55153421 A JP S55153421A
Authority
JP
Japan
Prior art keywords
counter
sweep
data
circuit
output
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
JP6042779A
Other languages
Japanese (ja)
Inventor
Eisaku Akutsu
Toshinori Murata
Shigeo Matsuura
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 JP6042779A priority Critical patent/JPS55153421A/en
Publication of JPS55153421A publication Critical patent/JPS55153421A/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
    • H03J7/18—Automatic scanning over a band of frequencies
    • H03J7/20—Automatic scanning over a band of frequencies where the scanning is accomplished by varying the electrical characteristics of a non-mechanically adjustable element
    • H03J7/28—Automatic scanning over a band of frequencies where the scanning is accomplished by varying the electrical characteristics of a non-mechanically adjustable element using counters or frequency dividers

Landscapes

  • Channel Selection Circuits, Automatic Tuning Circuits (AREA)

Abstract

PURPOSE:To extend the stable operating area of the channel number counter and to increase the noise interference removal characteristics, using surface acoustic wave filter, by controlling the tuning voltage sweep speed at a constant speed. CONSTITUTION:The output from the counter clock oscillator 21 is given to the timing counter 22 for pulse modulation, and the set signal gate circuit 23 gives the set pulse to the pulse width conversion circuit 24 while the data of the counter 22 is circulated. Further, the data of the sweep counter 28 and the data of the counter 22 are compared at the comparison circuit 25, the reset signal is output while the data are in agreement, and the conversion circuit 24 is reset. The tuning voltage in pulse width modulation is output from the output terminal 32 obtain the sweep of a given speed by forming the sweep circuit like this. Accodingly, the use of this sweep circuit allows the device using SAW filter to extend the stable region and noise rejection performance.
JP6042779A 1979-05-18 1979-05-18 Counter for channel number Pending JPS55153421A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP6042779A JPS55153421A (en) 1979-05-18 1979-05-18 Counter for channel number

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP6042779A JPS55153421A (en) 1979-05-18 1979-05-18 Counter for channel number

Publications (1)

Publication Number Publication Date
JPS55153421A true JPS55153421A (en) 1980-11-29

Family

ID=13141909

Family Applications (1)

Application Number Title Priority Date Filing Date
JP6042779A Pending JPS55153421A (en) 1979-05-18 1979-05-18 Counter for channel number

Country Status (1)

Country Link
JP (1) JPS55153421A (en)

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