Bedienungsanleitung Yamaha DSP-AX630SE (Seite 60 von 68) (Englisch)

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GLOSSARY

■ Dolby Surround

Dolby Surround uses a 4 channel analog recording system

to reproduce realistic and dynamic sound effects: 2 main

left and right channels (stereo), a center channel for

dialog (monaural), and a rear channel for special sound

effects (monaural). The rear channel reproduces sound

within a narrow frequency range.

Dolby Surround is widely used with nearly all video tapes

and laser discs, and in many TV and cable broadcasts as

well. The Dolby Pro Logic decoder built into this unit

employs a digital signal processing system that

automatically stabilizes the volume on each channel to

enhance moving sound effects and directionality.

■ Dolby Digital

Dolby Digital is a digital surround sound system that

gives you completely independent multi-channel audio.

With 3 front channels (left, center, and right), and 2 rear

stereo channels, Dolby Digital provides 5 full-range audio

channels. With an additional channel especially for bass

effects, called LFE (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 rear speakers, more

accurate moving sound effects and surround sound

environment are possible than with Dolby Surround. The

wide dynamic range (from maximum to minimum

volume) reproduced by the 5 full-range channels and the

precise sound orientation generated using digital sound

processing provide listeners with previously unheard of

excitement and realism.

With this unit, any sound environment from monaural up

to a 5.1-channel configuration can be freely selected for

your enjoyment.

Dolby Digital EX creates 6 full-bandwidth output

channels from 5.1-channel sources. This is done using a

matrix decoder that derives 3 surround channels from the

2 in the original recording. For the best results, Dolby

Digital EX should be used with movie sound tracks

recorded with Dolby Digital Surround EX. With this

additional channel, you can experience more dynamic and

realistic moving sound especially with scenes with “fly-

over” and “fly-around” effects.

■ Dolby Pro Logic

Dolby Pro Logic is an improved technique used to

decode vast numbers of existing Dolby Surround

softwares. This new technology enables a discrete 5-

channel playback with 2 main left and right channels, 1

center channel, and 2 rear left and right channels (instead

of only 1 rear channel for conventional Pro Logic

technology). A music mode is also available for 2-channel

sources in addition to the movie mode.

■ DTS (Digital Theater Systems)

Digital Surround

DTS digital surround was developed to replace the analog

soundtracks of movies with a 6-channel digital sound

track, and is now rapidly gaining popularity in movie

theaters around the world. Digital Theater Systems Inc.

has developed a home theater system so that you can

enjoy the depth of sound and natural spatial

representation of DTS digital surround in your home.

This system produces practically distortion-free 6-channel

sound (technically, a left, right and center channels, 2 rear

channels, plus an LFE 0.1 channel as a subwoofer, for a

total of 5.1 channels).

The unit incorporates DTS-ES compatible decoder that

enables 6.1-channel reproduction by adding the rear

center channel to existing 5.1-channel format. (The rear

center channel is created from rear left and right

channels.)

■ LFE 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 channels in a Dolby Digital or

DTS 5.1 channel systems.

■ CINEMA DSP

DIGITAL

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

YAMAHA has developed 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 using headphones.

0110V630_54-60_EN(GB) 1/11/02, 7:43 PM58

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