Yamaha AVX-S30 User Manual

■ 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 

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.