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Dolby Noise Reduction Dolby noise reduction systems dramatically reduce tape hiss, here are a few different types: Dolby B-type noise reduction is the original Dolby system designed for consumer tape recorders. It is inlcuded in all but the least expensive cassette machines today, and is used in the preparation of the vast majority of prerecorded cassettes. Dolby C-type noise reduction was developed to improve the cassette medium still further by providing twice the tape hiss reduction (20 dB) of Dolby B-type. It is offered along with Dolby B-type in a variety of mid-range and premium cassette decks and players. Dolby S-type is based upon the principles of the professional Dolby SR (Spectral Recording) process. It not only provides still more tape hiss reduction (24 dB), but also reduces low-frequency noise by 10 dB. Thus, it permits recording high-level signals at the frequency extremes more accurately and cleanly
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