DOLBY (Noise Reduction)
A technique developed by Dolby™ Laboratories which improves the signal-to-noise ratio of a recording by raising the level of specific frequencies in quiet passages before recording, and lowering them to their original levels during playback (a compression- expansion process). This automatically reduces any noise that was introduced as a result of the recording or playback process. There are several schemes related to DOLBY noise reduction, using different frequency bands of operation.
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