Digital audio coded method and its device which utilize the psychological acoustic model which is improved

摘要

This invention relates to the digital audio coded method of using the psychological acoustic model which is improved, the audio data coded method due to this invention the step which forms the CMDCT spectrum from input audio signal the step which decides window type with the quality of the input audio signal and, with the window type which is decided, and, making use of the window type which is decided, the step which forms the FFT spectrum from input audio signal and, making use of the CMDCT spectrum and the FFT spectrum which are formed, includes with the step which analyzes the psychological acoustic model.