Audio Noise Reduction Systems
The upper end of the dynamic range of an audio system is normally the level at which distortion occurs because of overload. The lower end of the range is set by noise: tape hiss, ‘thermal’ noise in electronic components, mains hum, and so on.
The effects of such noise can be reduced very significantly by noise reduction systems, which are commonly used, particularly in analogue recording. (Digital systems are almost totally unaffected by the noise problems mentioned above.) Most noise reduction systems make use of some form of companders—that is, the dynamic range is reduced before recording or transmission etc. and expanded afterwards. Unfortunately simple compressors and expanders generally produce audible side ...
Get The Video Studio, 3rd Edition now with the O’Reilly learning platform.
O’Reilly members experience books, live events, courses curated by job role, and more from O’Reilly and nearly 200 top publishers.
