Title:
SIGNAL PROCESSING METHOD
Document Type and Number:
Japanese Patent JP2004188726
Kind Code:
A
Abstract:
To effectively remove noises contained in an output from an encoder regardless of a speed at which a motor is driven.
A signal is outputted from the encoder 110 used for an instrument which drives a mechanism by using a motor as a power source. To the signal, a filter means 112 which can change a frequency to be passed is provided. The number of pulse signals contained in the signal which is outputted from the encoder within a specified period is counted by a counter 103. The output from a selector 2 101 is changed in such a manner that the frequency to be passed is made higher as the counted value becomes larger, and the frequency to be passed is made lower as the counted value becomes smaller.
Inventors:
HARADA KEIJI
Application Number:
JP2002358314A
Publication Date:
July 08, 2004
Filing Date:
December 10, 2002
Export Citation:
Assignee:
CANON KK
International Classes:
B41J19/18; H04N1/04; (IPC1-7): B41J19/18; H04N1/04
Attorney, Agent or Firm:
Yasunori Otsuka
Shiro Takayanagi
Yasuhiro Otsuka
Shuji Kimura
Shiro Takayanagi
Yasuhiro Otsuka
Shuji Kimura
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