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In which year Dolby laboratories introduced Dolby surround sound?

In which year Dolby laboratories introduced Dolby surround sound? Correct Answer 1982

In 1982, Dolby Laboratories introduced Dolby surround that has surround sound signal onto a stereo source through a process called matrix encoding. After few years, Dolby came with Pro-logic surround and since then many advanced surround sound systems are introduced to the point where as many as 11 speakers can be used to enable listeners experience a truly natural sound.

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