Pitch

Pitch is the perceived frequency of a sound or musical note. In musical terms, for example, a string vibrating at a frequency of 440Hz sounds at a pitch that people have named “A” above middle “C.” The greater the frequency, the higher the pitch.

In audio post, when a soundtrack is sped up or slowed down, which occurs during NTSC to PAL or PAL to NTSC conversions, the relative pitch of the track will change accordingly. Pitch-correction can be used when vari-speeding a track to retain the audio's original pitch while still permitting the speed change, however it can sometimes induce unpleasant audio artifacts.

This definition is licensed under the GNU Free Documentation License found at http://www.gnu.org/copyleft/fdl.html. It uses material from the Wiktionary definition at http://en.wiktionary.org/wiki/pitch.