Yamaha Digital Sound YSP-900 - Manual (Page 53)

USING SOUND FIELD PROGRAMS
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This unit is equipped with a variety of precise digital decoders that allow you to enjoy multi-channel playback from
stereo or multi-channel sources. This unit is also equipped with a YAMAHA CINEMA DSP (digital sound field
processing) chip containing several sound field programs which you can use to enhance your playback experience. Most
of the sound field programs are precise digital recreations of actual acoustic environments found in famous concert halls,
music venues and movie theaters.
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The YAMAHA CINEMA DSP modes are compatible with all Dolby Digital, DTS and Dolby Surround sources.
Choose a sound field program based on your listening preference and do not purely rely on the name of the sound field program itself.
A significant factor that 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 the listener to tell where the player is situated as well
as the size and shape of the room in which the listening is sitting.
■ Elements of a sound field
In any environment, there are two distinct types of sound reflections that combine with the direct sound coming straight
to our ears from the player’s instrument to make up the sound field.
Early reflections
Reflected sounds reach our ears extremely rapidly (50 ms to 80 ms after the direct sound) after reflecting from one
surface only (from the ceiling or a wall, for example). Early reflections help add clarity to the direct sound.
Reverberations
These are caused by reflections from more than one surface (i.e. wall, ceiling, the back of the room, etc.) 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 reverberation 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 listening room of virtually any size at all. This ability to create sound fields at will is exactly what
YAMAHA has done with the CINEMA DSP technology.
USING SOUND FIELD PROGRAMS
Note
What is a sound field?