Biological information measurement device and variable filter circuit
AssigneeMurata Manufacturing Co., Ltd.
InventorsNaoaki MATSUOKA, Suguru KUSANAGI, Kento FUJIKI, Mana KAWAHARA
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Abstract
A biological information measurement device in which a biological signal with a harmonic structure is input to a variable band-pass filter. A first signal, which has passed through the variable band-pass filter, is input to a frequency calculator. The frequency calculator outputs a second signal including information related to a frequency of the input first signal. A biological information acquirer acquires biological information from the second signal. A band-pass filter controller shifts a passband of the variable band-pass filter based on the information related to the frequency included in the second signal.
Claims13
A biological information measurement device comprising:
- a variable band-pass filter to receive a biological signal with a harmonic structure;
- a frequency calculator to receive a first signal that has passed through the variable band-pass filter and output a second signal including information related to a frequency of the received first signal;
- a biological information acquirer to acquire biological information from the second signal;
- and
- a band-pass filter controller configured or programmed to shift a passband of the variable band-pass filter based on the information related to the frequency included in the second signal.
A variable filter circuit comprising:
- a variable band-pass filter with a variable passband;
- a phase-locked loop to generate a tracking signal synchronized with a phase of a signal that has passed through the variable band-pass filter;
- and
- a band-pass filter controller configured or programmed to vary a passband of the variable band-pass filter based on a frequency of the tracking signal.
Dependencies are inferred from the claim text.