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| Pitch shifter (audio processor) ： ウィキペディア英語版 |
Pitch shift
Pitch shifting is a sound recording technique in which the original pitch of a sound is raised or lowered. Effects units that raise or lower pitch by a pre-designated musical interval (transposition) are called "pitch shifters" or "pitch benders".
==Pitch/time shifting==
The simplest methods are used to increase pitch and reduce durations, or ''vice versa'', reduce pitch and increase duration. This can be done by replaying a sound waveform at a different speed than it was recorded. It could be accomplished on an early reel-to-reel tape recorder by changing the diameter of the capstan drive shaft, or using a different motor. As technologies improved later designs of motor speeds could be controlled by electronic servo system circuits. This arrangement using “vari-speed” capstan motors allowed the speed change to be achieved more simply. As for vinyl records, the same thing can be done;
placing a finger on the turnable to give friction will retard it, while giving it a 'spin' can advance it.
抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』
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