Coincidence detection apparatus and method

Details Coincidence detection apparatus and method Coincidence detection apparatus and method

2006-12-26

2006-12-26

Ghebretinsae, Temesghen (Department: 2611)

Pulse or digital communications

Pulse position, frequency, or spacing modulation

C327S003000, C702S150000

Reexamination Certificate

active

07154947

ABSTRACT:
This invention is to allow accurate high-speed coincidence detection while preventing any increase in circuit scale. To achieve this object, a coincidence detection apparatus includes a detector which outputs at least two periodical signals in accordance with the displacement of an object, a digital interpolator which processes the periodical signal output from the detector at a predetermined time interval to generate a displacement or angle at a period shorter than the period of the periodical signal, a pulse generation unit which generates a constant frequency pulse signal, a counter which counts the pulse signal output from the pulse generation unit, and a pulse conversion unit which calculates a value to be set in the counter from the difference between displacement information corresponding to the target position of the object and the output from the digital interpolator.

REFERENCES:
patent: 5191336 (1993-03-01), Stephenson
patent: 6327319 (2001-12-01), Hietala et al.
patent: 6470292 (2002-10-01), Tanaka et al.

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