SOUND DETECTOR, SOUND DETECTION METHOD, SOUND FEATURE QUANTITY DETECTOR, SOUND FEATURE QUANTITY DETECTION METHOD, SOUND SECTION DETECTOR, SOUND SECTION DETECTION METHOD AND PROGRAM

摘要

PROBLEM TO BE SOLVED: To enable excellent detection of sound to be detected such as operating status sound emitted from a home appliance.SOLUTION: A sound detector extracts a feature quantity at every prescribed time from an input time signal. Whenever the feature quantity is newly extracted, the detector compares each line of the extracted feature quantities with each feature quantity line of a specific held number of sounds to be detected, and obtains a result of detecting the specific number of sounds to be detected. The detector obtains a likelihood distribution of tone likelihood from a time frequency distribution of the input time signal, and extracts the feature quantity at every prescribed time from a likelihood distribution after smoothing the obtained likelihood distribution in frequency and time directions. The detector can accurately detect the sound to be detected (such as operating status sound emitted from a home electric appliance), independently of an installation position of a microphone or the like.