Manual Yamaha AVS70 (page 30 of 40) (English)

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GLOSSARY

■ Encode/Decode

When a signal or other information is processed,

compressed and digitized, this is called encoding. Encoding

can be used to record an extremely large amount of

information on a single CD or DVD.

An encoded signal cannot be listened to directly. It must be

returned to its original state (i.e. audible sound) and this is

called decoding.

■ Sound field

Not all sound travels from the sound source directly into the

human ear, but instead reflects off of walls, ceilings and

other objects to arrive at the ear slightly delayed (early

reflection). It may also reflect repeatedly in a complicated

manner before reaching the ear (subsequent reverberation).

A human is able to perceive the size and shape of a location

based on the various sounds heard in this way. The specific

acoustic space of a particular building is called a sound

field.

■ Dolby Surround

In movie theaters and in live theaters, the spectators are

surrounded by many speakers and sound effects geared to

each scene are used to make sound move from front to back

and right to left. This gives the sound a three dimensional

feel that surrounds the entire body. Dolby Surround is used

to implement this realistic effect. Originally, the Dolby

Surround system consisted of a total of four channels: two

front channels (right and left), one center channel, and one

rear channel. Later, two-channel stereo compatibility was

added to for broadcast and video media used in the home.

The ability to easily set up a home AV system capable of

stereo reproduction is one of the biggest features of Dolby

Surround.

■ Dolby Digital

Dolby Digital consists of a total of five channels: three front

channels and two rear channels, plus a distinct LFE channel

for low frequency effect. It is therefore commonly referred

to as a 5.1 channel system. Using digital compression

technology for all 5.1 channels, Dolby Digital can be used

for completely independent audio reproduction. Dolby

Digital offers superior sound quality and a more three

dimensional surround effect in comparison to the older

Dolby Surround, which mixes four channels (three front and

one rear) into two-channel stereo and separates them using a

matrix circuit.

■ Virtual surround

We basically perceive the direction from which sounds

come to us based on the difference in time they reach the

right and left ears and differences in sound level. Virtual

technology is based on this property of the human ear. A

DSP (digital sound field processor — a form of digital

signal processing) and right and left front speakers are used

so that the listener feels like he or she is hearing sounds that

come from virtual speakers located in directions other than

just the two physical speakers. This allows the listener to

experience surround effects as if rear speakers were present

as in a five-speaker system.

■ YAMAHA DSP (Digital Sound Field

Processor)

YAMAHA technicians traveled to world famous concert

halls, opera houses and other locations just to measure

acoustical information such as the direction, intensity, band

characteristics, and delay time of reflected sounds. This

wealth of information was then put on a ROM.

Using a built-in YAMAHA DSP (digital sound field

processor) to create sound fields, this front speaker unit

allows you to freely select various sound field programs

created from this actual acoustical data so that you can

reproduce the sound field of famous halls and live houses

right in your listening room.

Movie makers design sounds for a movie so that the sound

and screen become one. Dialog is positioned right on the

screen, sound effects behind the screen, music behind that,

and surround effects wrap around the audience.

CINEMA DSP is a program for use in AV reproduction that

has evolved from YAMAHA DSP. Fusing the movie sound

decoders, Dolby Pro Logic and Dolby Digital, with

YAMAHA DSP, allows you to reproduce the type of

surround sound field of the quality found on a dubbing stage

designed to optimize movie surround conditions. (A

dubbing stage is the final mix used to complete the final

sound design for a movie.)

By adding YAMAHA DSP processing to both the right and

left front channels and the center channel, the CINEMA

DSP program wraps the audience in a surround sound field

that not only makes dialog real, but penetrates and

surrounds the screen to give depth to sound effects and

music as well as a smooth sense of movement to sound

sources.

APPENDIX

0105AV-S70_23-30_EN 3/29/0, 4:04 PM28

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Yamaha AVS70 Manual

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