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A trademark for an electronic device that eliminates noise from recorded sound and audio signals.
(Electronics) trademark any of various specialized electronic circuits, esp those used for noise reduction in tape recorders by functioning as companders on high-frequency signals
[named after Ray Dolby (1933–2013), its US inventor]
Dol•by(ˈdoʊl bi, ˈdɔl-)
a system for reducing high-frequency noise in audiotape using various electronic devices during recording and playback.