JPS5597708A - Frequency converter - Google Patents

Frequency converter

Info

Publication number
JPS5597708A
JPS5597708A JP512379A JP512379A JPS5597708A JP S5597708 A JPS5597708 A JP S5597708A JP 512379 A JP512379 A JP 512379A JP 512379 A JP512379 A JP 512379A JP S5597708 A JPS5597708 A JP S5597708A
Authority
JP
Japan
Prior art keywords
phase
signal
dividing
output
counter
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
JP512379A
Other languages
Japanese (ja)
Inventor
Kazuhide Kawada
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.)
NEC Corp
Original Assignee
NEC Corp
Nippon Electric 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 NEC Corp, Nippon Electric Co Ltd filed Critical NEC Corp
Priority to JP512379A priority Critical patent/JPS5597708A/en
Publication of JPS5597708A publication Critical patent/JPS5597708A/en
Pending legal-status Critical Current

Links

Landscapes

  • Stabilization Of Oscillater, Synchronisation, Frequency Synthesizers (AREA)

Abstract

PURPOSE: To attain the accurate digital conversion of the frequency of an input signal by varying a dividing ratio by controlling an up/down counter so that a divided input signal will be in phase with a fundamental frequency signal.
CONSTITUTION: An input signal is inputted to variable divider 3, where it is divided by a dividing-ratio output from up/down counter 5 to output a division output signal to phase detector 4. On the other hand, a fundamental frequency signal from fundamental frequency oscillator 1 is inputted to phase detector 4 via phase regulator 2 to make a comparison with the phase of the division output signal and when the both disagree each other, the dividing-ratio output of counter 5 is controlled to approximate frequencies of both signals each other, in addition to a fine adjustment of phases by phase regulator 2. When both the signals get in phase, a coincidence signal is outputed from phase coincidence detector 6 and the dividing-ratio output of counter 5 at that time is extracted as the digital value of the frequency.
COPYRIGHT: (C)1980,JPO&Japio
JP512379A 1979-01-19 1979-01-19 Frequency converter Pending JPS5597708A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP512379A JPS5597708A (en) 1979-01-19 1979-01-19 Frequency converter

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP512379A JPS5597708A (en) 1979-01-19 1979-01-19 Frequency converter

Publications (1)

Publication Number Publication Date
JPS5597708A true JPS5597708A (en) 1980-07-25

Family

ID=11602530

Family Applications (1)

Application Number Title Priority Date Filing Date
JP512379A Pending JPS5597708A (en) 1979-01-19 1979-01-19 Frequency converter

Country Status (1)

Country Link
JP (1) JPS5597708A (en)

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