| 摘要 |
Spaced segments of an analog sound signal the time axis of which is compressed are fed to stores 103, 104, and then the stored signal is read out at a rate which is slower than the rate at which it was written in so that the segments are time expanded. The operation is alternately repeated, whereby the output signal read out from the stores is compiled to provide a continuous output signal, the arrangement being controlled by a microcomputer, 121. The analog sound signal is sampled at the leading and trailing end portion of each sound segment and the samples converted to digital signals. The microcomputer evaluates the similarity of the data concerning the waveform at the trailing end portion of a preceding sound segment and the leading end portion of the succeeding sound segment by evaluating a mean square error or a mutual correlation function of the two sets of data. The phase shift of the succeeding sound segment to be joined to the trailing end portion of the preceding sound segment is determined by the result of the evaluation and applied to correct the time axis of the succeeding sound element, thereby to achieve continuity of the waveform at the junction of the preceding and succeeding sound elements. <IMAGE> |
