4.4 - What is Dolby HX-Pro?
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This article is from the Audio Professional FAQ, by with numerous contributions by Gabe M. Wiener others.
4.4 - What is Dolby HX-Pro?
HX-Pro is a scheme to reduce the level of the bias signal when high
frequency information is present in the recorded signal. Sufficient
high frequency information will act to bias the tape itself, and by
reducing the AC bias signal somewhat, additional signal can be
applied without saturating the tape. This is a single-ended system;
it requires no decoding on playback, because it merely permits more
signal to be recorded on the tape. In theory it is an excellent
idea, and some implementations have lived up to the promise of the
method, although some other implementations have produced unpleasant
artifacts. [Scott]
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