[ GLOSSARY DEFINITION ] Audio Dolby Digital A multi-channel audio format. Also known as: AC-3 Full Definition & Technical Explanation Dolby Digital — A multi-channel audio format.This audio term is part of the CompareTech technical dictionary and helps you read specifications, comparisons, and benchmark data across its device database.See also: ALAC MQA. Related Technical Terms ALAC Apple's lossless audio codec. Audio MQA Master Quality Authenticated — a hi-res audio format. Audio ← All Glossary Terms How We Score → ← Previous Term Next Term →