Editing Dolby noise-reduction system (section)

==Dolby S==
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[[File:Harman Kardon TD4800-130311-0014EC (cropped).jpg|thumb|400px|[[Harman Kardon|Harman/Kardon]] Dolby&nbsp;S tape deck, released 1991 and also incorporating HX&nbsp;Pro<ref name="HKTD4800"/>]]

Dolby&nbsp;S was introduced in 1989. It was intended that Dolby&nbsp;S would become standard on commercial pre-recorded music cassettes in much the same way that Dolby&nbsp;B had in the 1970s, but it came to market when the [[Compact Cassette]] was being replaced by the [[compact disc]] as the dominant mass market music format. Dolby Labs claimed that most members of the general public could not differentiate between the sound of a CD and a Dolby&nbsp;S encoded cassette. Dolby&nbsp;S mostly appeared on high-end audio equipment and was never widely used, although it did filter down to several mid-tier models manufactured during the mid to late 1990s.

Dolby&nbsp;S is much more resistant to playback problems caused by noise from the tape transport mechanism than Dolby&nbsp;C. Likewise, Dolby&nbsp;S was also claimed to have playback compatibility with Dolby&nbsp;B in that a Dolby&nbsp;S recording could be played back on older Dolby&nbsp;B equipment with some benefit being realized. It is basically a cut-down version of Dolby&nbsp;SR optimized specifically for cassette recording, and uses many of the same noise reduction techniques. Dolby&nbsp;S is capable of 10&nbsp;dB of noise reduction at low frequencies and up to 24&nbsp;dB of noise reduction at high frequencies.<ref name="Dolby_BCS_NR"/>

As with Dolby C, it is not ''just'' a noise reduction system. It employs the same anti-saturation and spectral skewing techniques as those used by Dolby C, reducing the effects of tape saturation and allowing for improved high frequency performance at high recording levels.
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