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Glossary
APPENDIX
■ 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.
■ “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.
■ Virtual CINEMA DSP
YAMAHA has developed a Virtual CINEMA DSP
algorithm that allows you to enjoy DSP sound field
surround effects even without any surround speakers by
using virtual surround speakers.
It is even possible to enjoy Virtual CINEMA DSP using a
minimal two-speaker system that does not include a center
speaker.
■ Bit stream
A signal that is compressed and changed into digital
format. Then depending on the decoder it can be
processed as 5.1 multi-channel audio.
■ 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.
■ Dynamic range
The difference between the smallest sound that can be
heard above the equipment noise and the biggest sound
that can be heard without distortion is the dynamic range.
■ LFE (Low Frequency Effect) 0.1 channel
This channel is for the reproduction of low bass signals.
The frequency range for this channel is 20 Hz to 120 Hz.
This channel is counted as 0.1 because it only enforces a
low frequency range compared to the full-range
reproduced by the other 5/6 channels in Dolby Digital or
DTS 5.1/6.1-channel systems.
■ Sampling frequency and quantized bit
rate
When converting an analog signal to digital, the number of
times the signal is sampled per second is called the
sampling frequency, while the degree of fineness when
converting the sound level into a numeric value is called
the quantized bit rate.
The frequency band that can be played back is determined
by the sampling rate, while the dynamic range expressing
the difference in sound level is determined by the
quantized bit rate. 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.
Sound field programs Audio information