Red Book Audio
Although rarely used, there exists the capability for standardized emphasis in Red Book CD mastering. As CD's were intended to work on 14 bit audio, a specification for 'pre-emphasis' was included to compensate for quantization noise. After production spec was set at 16 bits, quantization noise became less of a concern, but emphasis remained an option through standards revisions. The pre-emphasis curve is described as 50/15 µs at 20 db/decade.
Read more about this topic: Emphasis (telecommunications)
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