Sound Field Options; What Is A Sound Field - Yamaha DSP-Z9 Owner's Manual

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What is 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, and the size and shape
of the room in which we are sitting.
Elements of a sound field
In any environment, in addition to the direct sound coming straight to our ears from the player's instrument, there are two
distinct types of sound reflections that combine to make up the sound field:
Early reflections
Reflected sounds reach our ears extremely rapidly (50 ms – 100 ms after the direct sound), after reflecting from one
surface only — for example, from the ceiling or a wall. Early reflections actually add clarity to the direct sound.
Reverberations
These are caused by reflections from more than one surface — walls, ceiling, the back of the room — 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 virtually any size room at all. This ability to create sound fields at will is exactly what YAMAHA has done
with the digital sound field processor.
Sound field parameters (Stereo/Surround)
Use to select and adjust sound field parameters.
Item
DSP Level
Adjusts the level of all the DSP effect sounds.
Init. Delay
Adjusts the apparent distance from the source sound.
Room Size
Adjusts the apparent size of the sound field.
Liveness
Adjusts the reflectivity of the virtual walls in the hall.
Dialogue Lift
Adjusts the height of the front and center channel sounds.
Rev. Time
Adjusts the apparent size of the acoustic environment.
Adjusts the time difference between the beginning of the direct sound and the beginning
Rev. Delay
of the reverberation sound.
Rev. Level
Adjusts the volume of the reverberation sound.
Sur. Delay
Adjusts the delay between the front (left, right and center) signals and the surround signals.
Initialize
Initializes the parameters of the sound field program.
Sur.Init.Delay
Adjusts the delay between the direct sound and the first reflection in the surround sound field.
Sur.Room Size
Adjusts the apparent size of the surround sound field.
Sur.Liveness
Adjusts the apparent reflectivity of the virtual walls in the surround sound field.
SB Init.Delay
Adjusts the delay between the direct sound and the first reflection in the surround back sound field.

SOUND FIELD OPTIONS

Features
SOUND FIELD OPTIONS
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