Title:
周波数測定装置
Document Type and Number:
Japanese Patent JP5877188
Kind Code:
B2
Abstract:
A frequency measuring apparatus includes: a counter section adapted to count a signal including a pulse signal for a predetermined time period, and output a binary count value corresponding to a frequency of the signal including the pulse signal; and a low pass filter section adapted to perform a filtering process on the count value, wherein the low pass filter section includes a first stage filter and a second stage filter, the first stage filter is a moving average filter to which the count value is input, and which provides a binary output with a high-frequency component reduced, and the second stage filter performs an average value calculation on the binary output to provide an output with the high-frequency component reduced.
Inventors:
Todoroki Masayoshi
Application Number:
JP2013239872A
Publication Date:
March 02, 2016
Filing Date:
November 20, 2013
Export Citation:
Assignee:
Seiko Epson Corporation
International Classes:
G01R23/10; G01N5/02
Domestic Patent References:
| JP2000505547A | ||||
| JP2001502050A | ||||
| JP647706A |
Attorney, Agent or Firm:
Yoshiyuki Inaba
Katsuro Tanaka
Katsuro Tanaka