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Dolby
Well, Dolby
labs has created quite a few different standards of audio
noise reduction and encoding. Dolby isn't just noise reduction.
Here's
the most common buzzwords containing Dolby and their definition:
Dolby NR - a
filter that can be applied at playback to reduce tape hiss
Dolby B - a filter
that is applied at recording, and then again at playback
to reduce hiss.
Fairly portable from one tape deck to another.
Dolby C - a dynamic filter this is applied at recording, and then again
at
playback to reduce hiss.
Not very portable from one deck to another.
Dolby
Surround - a
way of encoding sound on a recording, and then extracting
that sound during playback to produce a rear channel. The
source material doesn't need to be encoded, but it usually
is to enhance the rear channel effect.
Dolby Pro Logic Surround - a way of encoding sound on a recording, and
then
extracting that information during playback to produce five
distinct channels, RL, FL, C, FR, RR during playback. Also
applies a steering function to enhance the directional effect.
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