AUDIO PROCESSING SYSTEM USING OVERSAMPLING

摘要

PURPOSE: An audio processing system using over-sampling is provided to process analog audio signals by using other coding systems according to frequency bands, so as to reduce sound quality deterioration caused when an existing audio system uses a decimation filter for recording and uses an over-sampling filter for play back. CONSTITUTION: An analog input unit(11) low pass-filters the first inputted analog audio signal, and outputs the second analog audio signal included in a preset frequency band. With the preset frequency band, a human acoustic signal processing system is capable of feeling a sound. An audio band separator generates the first digital data of a basic band and the second digital data of a high band from the second analog audio signal, on the basis of a preset sampling frequency and a preset decimation rate. The basic band and the high band divide entire bands of the second analog audio signal. The basic band has a lower frequency band than the high band. A lossless coder(21) performs a lossless compression coding for the second digital data. A formatter(23) formats the lossless compression coding-performed second digital data and the first digital data, and outputs formatted data.