Precautions - Sony HT-DDW990 Operating Instructions Manual

x Dolby Surround (Dolby Pro
Logic)
Audio processing technology developed by
Dolby Laboratories, Inc. Center and mono
surround information is matrixed into two
stereo channels. When reproduced, audio is
decoded and output in 4 channel surround
sound. This is the most common audio
processing method for DVD video.
x DTS Digital Surround
Digital audio encoding/decoding technology
for theaters developed by DTS, Inc. It
compresses audio less than Dolby Digital,
delivering a higher quality sound
reproduction.
x HDMI (High-Definition
Multimedia Interface)
HDMI is an interface that supports both video
and audio on a single digital connection. The
HDMI connection carries standard to high
definition video signals and multi channel
audio signals to audio/video components, such
as HDMI equipped TVs, in digital form
without degradation. The HDMI specification
supports HDCP (High-bandwidth Digital
Contents Protection), a copy protection
technology that incorporates coding
technology for digital video signals.
x Sampling frequency
To convert analog audio to digital, analog data
should be quantified. This process is called
sampling, and the number of times per second
the analog data is quantified is called the
sampling frequency. A standard music CD
stores data quantified at 44,100 times per
second, which is expressed as a sampling
frequency of 44.1 kHz. Generally speaking, a
higher sampling frequency means better sound
quality.

Precautions

On safety
Should any solid object or liquid fall into the
cabinet, unplug the receiver and have it
checked by qualified personnel before
operating it any further.
On power sources
• Before operating the receiver, check that the
operating voltage is identical with your local
power supply.
The operating voltage is indicated on the
nameplate on the back of the receiver.
• The unit is not disconnected from the AC
power source (mains) as long as it is
connected to the wall outlet, even if the unit
itself has been turned off.
• If you are not going to use the receiver for a
long time, be sure to disconnect the receiver
from the wall outlet. To disconnect the AC
power cord, grasp the plug itself; never pull
the cord.
• One blade of the plug is wider than the other
for the purpose of safety and will fit into the
wall outlet only one way. If you are unable to
insert the plug fully into the outlet, contact
your dealer.
• The AC power cord must be changed only at
a qualified service shop.
On heat buildup
Although the receiver heats up during
operation, this is not a malfunction. If you
continuously use this receiver at a large
volume, the cabinet temperature of the top,
side and bottom rises considerably. To avoid
burning yourself, do not touch the cabinet.
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