APPARATUS AND METHOD FOR PRE-PROCESSING SPEECH SIGNAL

摘要

An apparatus for pre-processing a speech signal capable of improving the performance of speech signal processing by extracting the characteristics of noise that are distinguished from those of speech, and a method for extracting a speech end-point for the apparatus are provided. The apparatus includes a noise/speech determination unit for calculating noise information from at least one of an initial frame and a final frame of an input speech signal and determining if a current frame of the speech signal is a noise frame or a speech frame using the noise information, a hangover application unit for determining a predetermined number of frames transmitted after the current frame as consecutive speech frames when the current frame is the speech frame, and a speech information update unit for storing the speech frame and the consecutive speech frames. Noise information can be accurately calculated by using at least one of an initial noise frame and a final noise frame and continuously updating the noise information.