Signal level detection device and signal level detection method
AssigneeKYB Corporation
InventorsTomoo KUBOTA, Masatoshi OKUMURA
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Abstract
A signal level detection device 1 and a signal level detection method according to a means for solving a problem of the present invention varies a cut-off frequency ωc, of a variable low-pass filter 3 which filters a signal level r. The cut-off frequency ωc is varied based on the signal level r or information referred to for estimating the signal level. The signal level detection device 1 and the signal level detection method therefore reduce a delay of a rise of the obtained signal level r from an actual signal level, and sufficiently remove noise superimposed on the signal level r even when the signal level r is extremely low. Accordingly, control performance improves regardless of a degree of the signal level r.
Claims15
A signal level detection device comprising:
- a signal level detection unit that obtains a signal level indicating a magnitude of a signal;
- a variable low-pass filter that has a variable cut-off frequency, and filters the signal level obtained by the signal level detection unit;
- and
- a frequency varying unit that varies the cut-off frequency of the variable low-pass filter based on the signal level or information referred to for estimating the signal level.
A signal level detection method comprising:
- a signal level detection step of obtaining a signal level indicating a magnitude of a signal;
- a frequency varying step of varying a cut-off frequency of a variable low-pass filter based on the signal level or information referred to for estimating the signal level;
- and
- a filtering step of filtering the signal level obtained in the signal level detection step bvv using the variable low-pass filter.
Dependencies are inferred from the claim text.