For Noise Reduction (DNR, Dolby B, Dolby C, etc.) we have a term and definition in Car Audio.

Noise Reduction (Dnr, Dolby B, Dolby C, Etc.) (Car Audio)

Various methods or schemes for reducing the level of noise on program material. Note that modern CDs don’t require such processing. (e.g., Since most of the old cassettes were recorded with Dolby B noise reduction, you should look for a cassette deck that features Dolby B on playback.)

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