DEVICE FOR ESTIMATING DETERIORATION FACTOR OF SPEECH RECOGNITION ACCURACY, METHOD FOR ESTIMATING DETERIORATION FACTOR OF SPEECH RECOGNITION ACCURACY, AND PROGRAM

摘要

The present invention provides a device for estimating the deterioration factor of speech recognition accuracy, the device capable of estimating an acoustic factor that leads to a speech recognition error. The device for estimating the deterioration factor of speech recognition accuracy comprises: an acoustic feature amount extraction unit for extracting an acoustic feature amount for each frame from a speech that is input; a posterior probability calculation unit for calculating, on the basis of a plurality of acoustic events preliminarily classified into either a deterioration factor class or a non-deterioration factor class, a posterior probability for each acoustic event for the acoustic feature amount for each frame; a filter unit for correcting the posterior probability by filtering the posterior probability for each acoustic event using a time-series filter with weighting coefficients developed in the time axis; a speech recognition unit for outputting a set of speech recognition results with a recognition score; a speech recognition result feature amount extraction unit for outputting a feature amount for the speech recognition results for each frame; and a deterioration factor output unit for calculating and outputting a principal deterioration factor class for the speech recognition accuracy for each frame on the basis of the corrected posterior probability, the feature amount for speech recognition results for each frame, and the acoustic feature amount for each frame.