Patent ID: 8886527
Filing Date: 2014-11-11
Classification: G10L

Abstract:
1. A speech recognition system comprising: a speech input unit that inputs a speech signal using a plurality of speech input channels, the speech input channels including a channel for speech collection and a channel for noise collection; an output evaluation unit that evaluates whether or not the speech signal of the channel for speech collection input by the speech input unit is the speech signal in a sound section, evaluates whether or not the speech signal of the channel for noise collection input by the speech input unit is the speech signal in an adaptive speech section ,and outputs the speech signal as the speech signal to be processed only when the speech signal is evaluated as the speech signal in the sound section or the speech signal in the adaptive speech section, the sound section being a speech section that assumes a speaker is speaking, and the adaptive speech section being the speech section which is required at a time of environment adaptation in a signal process or a speech recognition process; a signal processing unit that performs signal processing to the speech signal output by the output evaluation unit as the speech signal to be processed; a speech recognition processing unit that performs a speech recognition process to the speech signal, the speech signal being signal-processed by the signal processing unit; and a delay time measurement unit that measures delay time by a process for the speech signal; wherein the output evaluation unit changes an evaluation method of the speech signal, which is output to be processed, according to the delay time measured by the delay time measurement unit, and the delay time measurement unit measures the delay time in the signal process by the signal processing unit calculating a time difference between time when a certain speech signal is input to the signal processing unit from the output evaluation unit and time when the certain speech signal is output from the signal processing unit.