| 摘要 |
PURPOSE:To provide an audio compression method through which an audio waveform having smaller deviation and distorsion is obtained even though the compression percentage of the audio waveform is nearly equal to one. CONSTITUTION:The method employs a pitch extractor 2 which extracts the pitch period of digital audio data S(n), a time axis compressor 3 which computes compressed digital audio data Sc(n) by time axis compressing the data S(n) using the pitch period extracted by the extractor 2 and a multiplexer 4 which multiplexes the pitch period and the data Sc(n). During the compression of audio signals, an (n) times length (where (n) is an integer greater than 2) of the pitch period is cutout from a current pointer position of the inputted audio signal waveform and position which is one pitch period advanced, one pair of the cutout audio signals are weighted and added and one signal waveform is generated by compressing two axis audio signal waveforms. |
