Frequency measuring apparatus
AssigneeSeiko Epson Corporation
InventorMasayoshi Todorokihara
Life of this patent
Estimating the term…
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.
Claims9
A frequency measuring apparatus comprising:
- 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 of the binary 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, the first stage filter reduces a high frequency component, the first stage filter outputs a binary output, and
- the second stage filter performs an average value calculation of the binary output to reduce the high frequency component of the binary output, the second stage filter outputs an output.
Dependencies are inferred from the claim text.