APPARATUS AND METHOD FOR PLAYBACK SPEED ALTERING WITH PRESERVATION OF TONE SIGNAL

摘要

Provided is an apparatus and method for altering a playback speed while preserving a voice signal. The apparatus includes: a memory for storing compressed audio files; a file buffer for buffering the audio files stored in the memory; a playback speed controller for storing audio file information of the file buffer and generating playback speed information according to a playback speed request from a user; a decoder for restoring audio files transferred from the file buffer to PCM data; a data buffer for buffering PCM data from the decoder; a PCM data processor for finding a voiceless period from the PCM data from the data buffer and controlling a playback speed according to the playback speed information; and a CODEC for transforming the PCM data from the PCM data processor to audio analog signal.