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Title:
PHASE DISCRIMINATING CIRCUIT
Document Type and Number:
Japanese Patent JPS63309867
Kind Code:
A
Abstract:

PURPOSE: To execute a response at a high speed by a phase variation quantity and a phase variation direction which are obtained by presetting to a period counter by using the number of clock pulses when there is no phase variation, as a reference value, and subtracting the clock pulse at every one period of an input signal.

CONSTITUTION: By presetting to a period counter 38 by using the number of clock pulses in one period when there is no phase variation of a signal to be detected, as a reference value, and subtracting the reference value during one period of the signal to be detected, a phase variation quantity is obtained as a counter remaining value of the counter 38. Subsequently, from positive and negative of a result of subtraction obtained by each circuit 40W42 of a phase variation quantity counter, '0' decision and positive or negative decision, to which of the position or negative direction the phase has been varied is decided. In case of the positive direction, and in case of the negative direction, an FOW (forward) signal containing the number of pulses for showing a result of subtraction, and a BAK (backward) signal of a series of pulses in the same way are outputted, respectively, and by these signals, varying direction and a variable quantity can be obtained. Accordingly, even if a phase variation corresponding to plural pieces of clock pulses during one period of the signal to be detected, it is possible to follow up easily, therefore, a response can be executed at a high speed.


Inventors:
KANEKO KAZUMASA
KINOSHITA ISAMU
INOUE NAOHISA
Application Number:
JP14414387A
Publication Date:
December 16, 1988
Filing Date:
June 11, 1987
Export Citation:
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Assignee:
OMRON TATEISI ELECTRONICS CO
International Classes:
G01B7/00; G01D5/243; G01D5/245; G01R23/10; G01R25/00; (IPC1-7): G01B7/00; G01D5/243; G01D5/245; G01R23/10; G01R25/00
Domestic Patent References:
JPS5010169A1975-02-01
Attorney, Agent or Firm:
Kenji Ushiku