Signal processing device and signal processing method

摘要

A signal processing device includes: a detecting unit configured to a second feature value relating to a first feature value recognized to satisfy a recognition condition, from a second time series prior to a first time series of the first feature value in a times series of a feature value corresponding to an input signal; and a recognition condition changing unit configured to change the recognition condition so that the second feature value is recognized as a class for recognizing the first feature value.