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INTR
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APPENDIX
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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 playerfs 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/or the ceiling) so
numerous that they merge together to form a continuous
sonic afterglow. They are nondirectional and lessen the
clarity of the direct sound.
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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
provides the audiovisual experience of a movie theater in the listening
room of your own home by using the Yamaha original sound field
technology combined with various digital audio systems.
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CINEMA DSP 3D
The actually measured sound field data contain the
information of the height of the sound images. CINEMA
DSP 3D feature achieves the reproduction of the accurate
height of the sound images so that it creates the accurate
and intensive stereoscopic sound fields in a listening
room.
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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.
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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.
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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
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.
