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Yamaha DSP-A1092 Owner's Manual Page 8

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Dolby Pro Logic Surround
This unit employs a Dolby Pro Logic Surround decoder similar
to professional Dolby Stereo decoders used in many movie
theaters. By using the Dolby Pro Logic Surround decoder, you can
experience the dramatic realism and impact of Dolby Surround
movie theater sound in your own home. Dolby Pro Logic employs a
four channel five speaker system. The Pro Logic Surround system
divides the input signal into four levels: the left and right main
channels, the center channel (used for dialog), and the rear
surround sound channels (used for sound effects, background
noise, and other ambient noises). The center channel allows
listeners seated in even less-than-ideal positions to hear the dialog
originating from the action on the screen while experiencing good
stereo imaging. Dolby Surround is encoded on the sound track of
pre-recorded video tapes, laser discs, and some TV/cable
broadcasts. When you play a source encoded with Dolby Surround
on this unit, the Dolby Pro Logic Surround decoder decodes the
signal and distributes the surround-sound effects.
This Dolby Pro Logic Surround Decoder employs a digital
signal processing system. This system improves the stability of
sound at each channel and crosstalk between channels, so that
positioning of sounds around the room is more accurate compared
with conventional analog signal processing systems.
In addition, this unit features a built-in automatic input balance
control. This always assures you the best performance without
manual adjustment.
6
Dolby Digital (AC-3)
The built-in Dolby Digital (AC-3) Decoder leads you into a
totally new sound experiences.
Dolby Digital (AC-3) is a new generation of multi-channel digital
audio technology, or the newest spatial sound processing format
developed for 35 mm film-movies by employing a new kind of low
bit-rate audio coding.
Dolby Digital (AC-3) is a digital surround sound system that
provides completely independent multi-channel audio to
consumers. In multi-channel form, Dolby Digital (AC-3) provides
five full range channels in what is sometimes referred to as a "3/2"
configuration: three front channels (left, center and right), plus two
surround channels. A sixth bass-only effect channel is also
provided for output of LFE (low frequency effect), or low bass
effects that are independent of other channels. This channel is
counted as 0.1, thus giving rise to the term 5.1 channels in total.
Compared to Dolby Pro Logic that is referred to a "3/1" system
(left front, center, right front and just one surround channel), Dolby
Digital (AC-3) features two surround channels, called stereo or
split surrounds, each offering the same full range fidelity as the
three front channels.
Sound of wide dynamic range reproduced by the five full range
channels presents listeners much excitement that has never been
experienced before. Precise sound orientation by the discrete
digital sound processing expands realism that the original movie
possesses.

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