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Yamaha AP-U70 Manual

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E-4
OUTLINE OF THIS UNIT
Virtual 3D
FL C FR
RL RR
FL C FR
RL RR
Virtual speakers
Typical surround system Virtual 3D
Early sound
reflections
Reverberation
Direct sound
Surround sound typically requires several speakers
situated in front of and behind the listening position, which
requires a substantial amount of space that may not always
be available. This unit uses Yamaha’s unique “Virtual 3D
(three-dimensional)” technology to simulate a typical
surround sound system using only two speakers. Virtual
3D, which is used by this unit’s sound field programs,
simulates the surround effect provided by rear and center
speakers, creating “virtual” surround speakers, as shown,
so even with only two front speakers, you can still enjoy
surround sound.
Digital Sound Field Processing (DSP)
When you listen to a performance in a concert hall, jazz
club, or other live music venue, you not only hear the direct
sound coming from the musical instruments and singers,
but also the “early reflections” and natural reverberation.
Early reflections are the initial sound waves that bounce off
the floor, ceiling, and walls. Natural reverberation is made
up of sound waves that gradually attenuate as they bounce
repeatedly off multiple surfaces.
Since the way you hear early reflections and reverberation
depends on the shape and size of the building as well as
the material and construction of the walls and ceiling, each
venue has its own unique “sound,” called its “sound field.”
At Yamaha, we have measured all the elements that make
up a typical sound field—direction and level of the
reflections, band-width characteristics, and delay times—at
famous concert halls and opera houses around the world.
The information gained in this process has been converted
into programs that can be reproduced using Yamaha’s DSP
technology. Using its on-board DSP, this unit can process
any audio source and recreate the atmosphere of the
original venue.
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