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Adjusting the Sound
Pro Logic Emulation Mode
The Pro Logic emulation mode offers users the same robust surround processing as original Pro Logic, in case the
source content is not of optimum quality, or if there is a desire to hear the program more "as it used to be". When this
mode is used, it is called Pro Logic, as before. There is no "Pro Logic I" mode. The Pro Logic emulation mode is optional.
Dolby does not require PLII products to use the original Pro Logic decoding algorithm. However, if the DSP contains
the original Pro Logic code, and if the product maker would like to use it, this is quite acceptable and even encouraged.
A product must not offer both original Pro Logic and the Pro Logic emulation mode.
Matrix Mode
The Matrix mode is the same as the Music mode except that the directional enhancement logic is turned off. It may
be used to enhance mono signals by making them seem "larger". The Matrix mode may also find use in auto systems,
where the fluctuations from poor FM stereo reception can otherwise cause disturbing surround signals from a logic
decoder. The ultimate "cure" for poor FM stereo reception may be simply to force the audio to mono.
Manufactured under license from Dolby Laboratories.
'Dolby', 'Pro Logic' and the double-D symbol are trademarks of Dolby Laboratories.
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