| 摘要 |
PROBLEM TO BE SOLVED: To impart an effect of a swing or the like to audio phrases by application of a time stretch technique by executing the time base compression and elongation reproduction to be executed by a compression and elongation reproducing means in accordance with the control signal from a control signal memory means. SOLUTION: The waveform data consisting of front beats (quarter notes) 1 and back beats (eighth notes) 4 are (a) subjected to time base compression and elongation and are reproduced in real time in accordance with the time rate (time base compression and elongation quantity information) signal TRATE (b) of the control signal. The value of the time rate signal TRATE is negative and elongation is executed mainly at the front beats 2. Since the time rate signal TRATE of the negative value continues, the elongation is continued. Consequently, the timing entering the rear beats 4 is slower than the intrinsic timing. The compression is started after lapse of the intrinsic timing of the rear beats 4 and the state that the compression and elongation are not executed is returned at the top of the front beats 2 of the next beat. The tones corresponding to the back beats 4 move relatively backward at the eventually resulted waveform (c). |
