n [ U ]
an electronic system that reduces noise to improve the sound of tape recordings, films, etc. It was invented in London by Ray Dolby (1933– ), a recording engineer born in the US:
The new cinema has a Dolby sound system.
DOLBY
Meaning of DOLBY in English
Oxford guide to British and American culture English vocabulary. Руководство по британской и американской культуре, Оксфордский английский словарь. 2005