Encoder and signal adjustment method for the same

Details Encoder and signal adjustment method for the same Encoder and signal adjustment method for the same

2006-10-03

2006-10-03

JeanPierre, Peguy (Department: 2819)

Coded data generation or conversion

Converter compensation

C341S155000

Reexamination Certificate

active

07116252

ABSTRACT:
An encoder includes: a detector; an A/D converter for performing A/D conversion for a two-phase analog signal output from the detector; an error correction circuit for correcting an error of the two-phase analog signal; an interpolation circuit for performing interpolation from the corrected result of A/D conversion; a memory for storing correction data; and a central processing unit (CPU) having communication means. The result of A/D conversion of the two-phase analog signal is sent by the communication means to an external personal computer. The error of sine and cosine signals from a predetermined value is detected by the personal computer and is sent by the communication means. The encoder performs interpolation in which the error is corrected by using the received correction data. Thus, it is possible to perform signal adjustment without observing a display screen of an oscilloscope, while confirming a status of signal adjustment in a non-stepped manner. This enables optimum adjustment and confirmation to be performed, and reduces an interpolation error caused by adjustment of the encoder signal.

REFERENCES:
patent: 5252825 (1993-10-01), Imai et al.
patent: 5506579 (1996-04-01), Spaulding
patent: 5625310 (1997-04-01), Takeishi
patent: 5706219 (1998-01-01), Ishimoto
patent: 5719789 (1998-02-01), Kawamata
patent: SHO 54-19773 (1979-02-01), None
patent: B2 3202316 (2001-06-01), None

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