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PHASE CONTROL technology14
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Chapter 14:
PHASE CONTROL technology
PHASE CONTROL technology is used with this unit.
During multi-channel playback in a typical home theater, the
LFE (Low Frequency Effects) signals and low-pitched
components contained in various channels are routed to the
subwoofer or other optimum speaker. However, in principle,
this routing process results in a frequency where the phase is
shifted (group delay), leading to problems where the low-
frequency sounds only arrive delayed or low-pitched sounds
cancel each other out due to interference with other
channels. The PHASE CONTROL technology in the unit is
used to recreate powerful low-pitched sounds that are faithful
to the original sounds.
The phase indicates the time relationship between two sound
waves. Two sounds waves are said to be “in phase” if their
peaks match up with each other, and the phases are said to
be “out of phase” if their peaks do not match up.
When the PHASE CONTROL technology is used, it can
provide the following effects when the sound source is played
back.
No PHASE CONTROL technology
Rhythm is out of phase and unclear
Poor quality of low-pitched sounds
Musical instruments have an unrealistic sound
With PHASE CONTROL technology
•Clear rhythm
Low-pitched sounds keep their quality
Musical instruments have a realistic sound
Note
•The PHASE CONTROL technology is always activated.
Phase Control technology is a trademark assigned to
products that provide matching of the phase characteristics
from recording to playback based on the PHASE CONTROL
technology concept developed by PIONEER.
Front speaker
Subwoofer Timing is
delayed, and
sounds cancel
each other out
Sound
source
Listening
position
Front speaker
Subwoofer
Original sound
tone can be
heard
Sound
source
Listening
position
SBX-B70_En.book 40 ペー 01年413 月日 前1時2
40


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