Noise suppression apparatus and method for speech recognition, and speech recognition apparatus and method

摘要

A target voice elimination unit reliably eliminates a target voice and outputs a target voice elimination signal including only a noise component. A target voice emphasis unit outputs a target voice emphasis signal from which a noise component is eliminated to some extent. A noise spectrum information extraction unit extracts noise spectrum information from the target voice elimination signal, and a target voice spectrum information extraction unit extracts target voice spectrum information from the target voice emphasis signal. A degree of multiplexing of noise estimation unit reliably detects the position where noise is superimposed and the magnitude of the noise from the noise spectrum information and the target voice spectrum information and obtains a degree of multiplexing of noise. A spectrum information correction unit reliably corrects the target voice spectrum information using the information of the degree of multiplexing of noise indicating the position and magnitude of the noise detected correctly. The influence of noise is greatly reduced in the spectrum information, thereby the accuracy of speech recognition can be improved.