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What is the difference between Dolby A, B, C, S, and SR? How do each of these systems work? How do they affect the sound?

April 26, 2017affect Dolby sound SR SYSTEMS

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What is the difference between Dolby A, B, C, S, and SR? How do each of these systems work? How do they affect the sound?

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The Dolby A, B, C, SR, and S noise reduction (NR) systems are non-linear level-dependent companders (compressors/expanders). They offer various amounts of noise reduction, as shown in the table below.