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ADDITIONAL INFORMATION
ADDITIONAL INFORMATION
■ Air Surround
Front surround sound system which is developed by
Yamaha enables the surround sound field using six
speaker units built in two satellite speakers. In comparison
with traditional front surround technologies, the Air
Surround system enables a wide range of natural surround
sound field.
■ Channel (ch)
A channel is an audio type that has been divided based on
range and other characteristics.
Ex. 5.1 channel
• Front speakers, Left (1ch), Right (1ch)
• Center speaker (1 ch)
• Surround speakers, Left (1ch), Right (1ch)
• Subwoofer (1 ch x 0.1
*
= 0.1 ch)
*
In contrast to a full 1-channel band, a component designed to
enhance low frequency sound for added effect.
■ CINEMA DSP
(Digital Sound Field Processor)
Since the Dolby Surround and DTS systems were
originally designed for use in movie theaters, their effect
is best felt in a theater having many speakers and designed
for acoustic effects. Since home conditions, such as room
size, wall material, number of speakers, and so on, can
differ so widely, it’s inevitable that there are differences in
the sound heard as well. Based on a wealth of actually
measured data, YAMAHA CINEMA DSP uses
YAMAHA original sound field technology to combine
Dolby Pro Logic, Dolby Digital and DTS systems to
provide the visual and audio experience of movie theater
in the listening room of your own home.
■ Dolby Digital
Digital surround sound system which is developed by
Dolby Laboratories provides completely independent
multi-channel audio. With 3 front channels (left, center,
and right) and 2 surround stereo channels, Dolby Digital
provides five full-range audio channels. With an additional
channel especially for bass effects (called LFE, or low
frequency effect), the system has a total of 5.1-channels
(LFE is counted as 0.1 channel). By using 2-channel
stereo for the surround speakers, more accurate moving
sound effects and surround sound environment are
possible than with Dolby Surround.
■ Dolby Pro Logic II
It is an improved matrix decoding technology that
provides better spatiality and directionality on Dolby
Surround programmed material; provides a convincing
three-dimensional sound field on conventional stereo
music recordings; and is ideally suited to bring the
surround experience to automotive sound. While
conventional surround programming is fully compatible
with Dolby Surround Pro Logic II decoders, soundtracks
will be able to be encoded specifically to take full
advantage of Pro Logic II playback, including separate left
and right surround channels. (Such material is also
compatible with conventional Pro Logic decoders).
■ DTS (Digital Theater System)
Digital surround sound system developed by Digital
Theater Systems, Inc., which provides 5.1 channel audio.
With an abundance of audio data, it is able to provide
authentic-sounding effects.
■ DVS (Dolby Virtual Speaker)
Front surround sound system which is developed by
Dolby Laboratories provides 5.1-channel audio.
■ PCM (Pulse Code Modulation)
A signal that is changed to digital format without
compression. A CD is recorded with 16-bit sound at 44.1
kHz, while DVD recording is anywhere from 16 bits at 48
kHz to 24 bits at 192 kHz, which makes it a higher quality
sound than CD. This signal also has a type called Packed
PCM (PPCM) that can be compressed without any loss of
data.
■ Sampling frequency
The number of sampling (process for digitalizing analog
signals) per second. In principle, the higher the sampling
rate, the wider the frequency range that can be played
back, and the higher the quantized bit rate, the finer the
sound that can be reproduced.
■ “SILENT CINEMA”
“SILENT CINEMA” was developed by YAMAHA as a
natural, realistic sound effect DSP algorithm for
headphones. Parameters for headphones have been set for
each sound field so that accurate representations of all the
sound field programs can be enjoyed on headphones.
Glossary