SIGNAL ANALYSIS DEVICE, SIGNAL PROCESSING DEVICE, SPEECH RECOGNITION DEVICE, SIGNAL ANALYSIS PROGRAM, SIGNAL PROCESSING PROGRAM, SPEECH RECOGNITION PROGRAM, RECORDING MEDIUM, AND ELECTRONIC DEVICE

摘要

A signal analysis device includes: frequency band division means for dividing an input signal into a signal of a plurality of frequency bands; band energy extraction means for extracting band energy in each band for the input signal divided into respective bands; and normalization means for normalizing the extracted band energy for each band and obtaining normalized band energy for each band. With this configuration, it is possible to obtain a stable speech recognition accuracy even under a high-noise environment. Moreover, it is possible to obtain a stable speech recognition accuracy even when speech having no noise section is input or when the noise level is gradually changed during vocalization.