Yamaha DSP-AX1 Manuel télécharger pdf (Page 69)

English

Digital Sound Field Processing (DSP)

Understanding Sound Fields

A sound field is defined as the “characteristic sound reflections of a particular space.” In

concert halls and other music venues, we hear early reflections and reverberations as well

as the direct sound produced by the artist(s). The variations in the early reflections and

other reverberations among the different music venues is what gives each venue its

special and recognizable sound quality.

Yamaha sent teams of sound engineers all around the world to measure the sound

reflections of famous concert halls and music venues, and collect detailed sound field

information such as the direction, strength, range, and delay time of those reflections.

Then we stored this enormous amount of data in the ROM chips of the DSP-AX1.

Recreating a Sound Field

Recreating the sound field of a concert hall or an opera house requires localizing

the virtual sound sources in your listening room. The traditional stereo system that

uses only two speakers is not capable of recreating a realistic sound field.

Yamaha’s DSP requires four effect speakers to recreate sound fields based on the

measured sound field data. The processor controls the strength and delay time of

the signals output from the four effect speakers to localize the virtual sound

sources in a full circle around the listener.

The DSP sound field programs can be classified in two types based on the sound

field processing method: programs that use early reflections only and programs

that use both early reflections and reverberation.

E/R (Early Reflection)

Each sound field is distinguished by the structure of the reflected sound. The increased processing capability of DSP technology enables

Yamaha engineers to incorporate even minute reflections with long delay times into the sound field data.

4ch REV. (Four Channel Reverberation)

This type of program consists of early reflections and high quality digital reverberation processing. Reverberation is the most important

element for recreating the sound field of a church. To recreate a realistic spatial sound image from reverberation data, Yamaha has adapted

the four-channel-output reverberation technology.

Illustration of the Virtual Sound Sources and Echo Patterns

The virtual sound sources and echo patterns for the DSP sound field programs are shown below. The illustration of the virtual sound sources

shows early reflection sound only and the illustration of the echo patterns shows both reflected sound and reverberation.

The center of these circles represent the virtual sound

source.

The size of the circle indicates the strength of the

virtual sound source.

The direct sound source

The listening position

Virtual Sound Sources

Echo Patterns

Direct sound source

Early

reflections

50~80 mSec

Reverbration

1 2 ... 64 65 66 67 68 69 70 71 72 73 74 ... 87 88

Commentaires sur ces manuels

Pas de commentaire

Yamaha DSP-AX1 Manuel Page 69

Commentaires sur ces manuels

Produits connexes et manuels pour Récepteurs AV Yamaha DSP-AX1