Audio Post Production Knowledge Base

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Academy Curve
The Academy curve is a standard playback equalization curve for pre-1975 mono, non-Dolby® optical soundtracks. It functions as the second part of a noise reduction scheme that begins by adding a “pre-emphasis” to audio intended for theatrical playback by boosting its high frequencies. When

Vari-speed
Vari-speeding sound allows an audio engineer to deviate from (or to) a standard speed. It is the process of changing the speed of an audio track to match the speed of another audio track or video source. Vari-speeding is often used to correct speed variations due to rate conversion or

Bleed Through
Magnetic tape or film stores audio information via metal particles applied to one side of the tape or film. A record head applies a magnetic flux to those particles, which then orient themselves to represent the audio information. A playback head reads the magnetic flux stored on the tape to