Yamaha DSP-AX863SE - Manual (Page 111)

SOUND FIELD PROGRAM INFORMATION
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■ Elements of a sound field
What really creates the rich, full tones of a live instrument
are the multiple reflections from the walls of the room. In
addition to making the sound live, these reflections enable
us to tell where the player is situated as well as the size
and shape of the room in which we are sitting.
There are two distinct types of sound reflections that
combine to make up the sound field in addition to the
direct sound coming straight to our ears from the player’s
instrument.
Early reflections
Reflected sounds reach our ears extremely rapidly (50 ms
to 100 ms after the direct sound), after reflecting from one
surface only (for example, from a wall or the ceiling).
Early reflections actually add clarity to the direct sound.
Reverberations
These are caused by reflections from more than one
surface (for example, from the walls, and the ceiling) so
numerous that they merge together to form a continuous
sonic afterglow. They are non-directional and lessen the
clarity of the direct sound.
Direct sound, early reflections and subsequent
reverberations taken together help us to determine the
subjective size and shape of the room, and it is this
information that the digital sound field processor
reproduces in order to create sound fields.
If you could create the appropriate early reflections and
subsequent reverberations in your listening room, you
would be able to create your own listening environment.
The acoustics in your room could be changed to those of a
concert hall, a dance floor, or a room with virtually any
size at all. This ability to create sound fields at will is
exactly what Yamaha has done with the digital sound field
processor.
■ CINEMA DSP
Since the Dolby Surround and DTS systems were
originally designed for use in movie theaters, their effect
is best felt in a theater having many speakers designed for
acoustic effects. Since home conditions, such as room
size, wall material, number of speakers, and so on, can
differ so widely, it is inevitable that there are differences in
the sound heard. Based on a wealth of actually measured
data, Yamaha CINEMA DSP uses Yamaha original sound
field technology to combine Dolby Pro Logic, Dolby
Digital and DTS systems to provide the audiovisual
experience of a movie theater in the listening room of your
own home.
■ SILENT CINEMA
Yamaha has developed a natural, realistic sound effect
DSP algorithm for headphones. Parameters for
headphones have been set for each sound field so that
accurate representations of all the sound field programs
can be enjoyed on headphones.
■ Virtual CINEMA DSP
Yamaha has developed a Virtual CINEMA DSP algorithm
that allows you to enjoy DSP sound field surround effects
even without any surround speakers by using virtual
surround speakers. It is even possible to enjoy Virtual
CINEMA DSP using a minimal two-speaker system that
does not include a center speaker.
■ Compressed Music Enhancer
The Compressed Music Enhancer feature of this unit
enhances your listening experience by regenerating the
missing harmonics in a compression artifact. As a result,
flattened complexity due to the loss of high-frequency
fidelity as well as lack of bass due to the loss of low-
frequency bass is compensated, providing improved
performance of the overall sound system.
Sound field program information