Patent ID: 9044206
Filing Date: 2015-06-02
Classification: A61B

Abstract:
1. A pulse detector that detects a pulse signal that originates from a pulse of a subject, the pulse detector, comprising: a pulse wave sensor that outputs a pulse wave signal in which are intermixed the pulse signal and a noise signal including a body movement noise signal originating in the body movement of the subject; a pulse wave signal filtering section having a first adaptive filter and a second adaptive filter that self-adaptively adjust a frequency response characteristic, the first and second adaptive filters being filters that filter the pulse wave signal, and an adaptive filter switching section that switches the adaptive filter to be used, where the switching occurs in a first interval in which the pulse wave sensor is continuously operating; and a pulse wave frequency analyzer that performs a frequency analysis process at predetermined time intervals on the basis of a filtered signal outputted from the pulse wave signal filtering section and identifying a pulse-presenting spectrum that shows the pulse signal, wherein at a first time point partway through a second interval in which the first adaptive filter is continuously carrying out adaptive processing, where the second interval occurs in the first interval, the adaptive filter switching section causes the second adaptive filter to start adaptive processing, and switches from the first adaptive filter to the second adaptive filter at a second time point that is a time point after the first time point and is the end point of the second interval.