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Audio Post Production Knowledge Base
Bias
Bias is a very high frequency signal that is incorporated in the recording of any magnetic medium. Magnetic recording equipment generates a bias current that is required to enable the magnetic oxide to record the audio portion of a signal - somewhat like an audio catalyst. The signal generated 
Loudness
The perceived quality of sound directly correlated to an increase or decrease in amplitude (volume). Loudness is a highly subjective measurement that varies from person to person and is affected by many factors such as frequency, duration and sound pressure levels (SPL). More objective measurements
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
