Pitch Correction

Pitch correction is the process of restoring the original pitch without changing the speed or duration of the program material. For example, when converting a NTSC standard audio program to PAL, the audio speed must be increased 4.1%. When audio speed increases, the pitch rises. If pitch correction is applied, the program material can be played back at the faster PAL speed but the pitch will be lowered to match the original NTSC pitch.