| 摘要 |
PURPOSE:To generate a loop waveform whose loop start point and end point meet zero-cross positions of a waveform from digital waveform data according to simple specification. CONSTITUTION:The number M' of sampling points in every (n) basic cycles of a waveform signal which has an optional specified pitch is calculated when the waveform signal is sampled in such sampling cycles T that (n) cycles of a reference pitch can almost be divided. Then when the waveform section of (n) basic cycles for loop regeneration is specified, the loop section from the start zero-cross position LST of the waveform section to the end zero-cross position of the loop section is extracted to calculate the loop section length (LET-LST). This loop section length is divided by M' to calculate a sampling cycle T'. Then the loop section is resampled in sampling cycles T' so that the LST and LET are included as sampling points LSP and LEP, thereby generating loop waveform data which can be loop-regenerated with the optional specified pitch. |
