JPS55115737A - Digital phase synchronism circuit - Google Patents

Digital phase synchronism circuit

Info

Publication number
JPS55115737A
JPS55115737A JP2311379A JP2311379A JPS55115737A JP S55115737 A JPS55115737 A JP S55115737A JP 2311379 A JP2311379 A JP 2311379A JP 2311379 A JP2311379 A JP 2311379A JP S55115737 A JPS55115737 A JP S55115737A
Authority
JP
Japan
Prior art keywords
output
circuit
zero cross
input signal
oscillation 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
JP2311379A
Other languages
Japanese (ja)
Inventor
Tatsuki Hayashi
Akira Kawasaki
Toshiyuki Yamamoto
Takao Gotoda
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 Ltd
Original Assignee
Fujitsu 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 Ltd filed Critical Fujitsu Ltd
Priority to JP2311379A priority Critical patent/JPS55115737A/en
Publication of JPS55115737A publication Critical patent/JPS55115737A/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

Abstract

PURPOSE:To enable synchronism with the sampling frequency in non-multiple of the input signal, by controlling the oscillator with the output in response to the time ratio at the time points of two in synchronizing with the oscillator output clipping the zero cross of the input signal. CONSTITUTION:The input signal 21 having the amplitude at sampled and scattered points is fed to the zero cross estimate circuit 22 to detect the information at the zero cross point. Further, the time tau2 before the zero cross of one sampling period is counted with the pulses of the oscillation circuit 23 to obtain the amount of phase n2, it is set with the signal 27 frequency dividing the output of the oscillation circuit 23, the output of the oscillation circuit 23 is counted. By controlling the oscillation circuit 23 with the signal comparing the amount of phase n3 and n2 of counter 25 to stop the count at the changing point of the estimate circuit 22 to positive sign at the comparison circuit 28, the output signal 27 is obtained, which is in synchronizing with the input signal 21.
JP2311379A 1979-02-28 1979-02-28 Digital phase synchronism circuit Pending JPS55115737A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP2311379A JPS55115737A (en) 1979-02-28 1979-02-28 Digital phase synchronism circuit

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP2311379A JPS55115737A (en) 1979-02-28 1979-02-28 Digital phase synchronism circuit

Publications (1)

Publication Number Publication Date
JPS55115737A true JPS55115737A (en) 1980-09-05

Family

ID=12101415

Family Applications (1)

Application Number Title Priority Date Filing Date
JP2311379A Pending JPS55115737A (en) 1979-02-28 1979-02-28 Digital phase synchronism circuit

Country Status (1)

Country Link
JP (1) JPS55115737A (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH02212775A (en) * 1989-02-13 1990-08-23 Fuji Electric Co Ltd Pll circuit and alternating current voltage detecting circuit

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH02212775A (en) * 1989-02-13 1990-08-23 Fuji Electric Co Ltd Pll circuit and alternating current voltage detecting circuit

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