| 摘要 |
A time-scale modification method or apparatus performs time-scale modification (i.e., compression or expansion with respect to time) on original audio signals having waveforms. Adjacent wave segments are divided and cut from the waves of the original audio signals by various lengths. A certain number of samples are thinned out from each of the adjacent waveform segments to provide a reduced amount of data. Calculations are performed on the reduced amount of data to sequentially produce similarities between the adjacent wave segments in response to the various lengths. The similarities are evaluated to determine a length that provides a best similarity within the various lengths as a basic period. The waves of the original audio signals are divided and cut into two waves by the basic period. Time-scale modification is effected on the two waves to produce a mixed wave. Using the mixed wave, it is possible to provide output signals, which correspond to results of the time-scale modification on the original audio signals in accordance with a designated time-scale modification factor without causing pitch variations.
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