Pioneer VSA-E03 Kullanım Talimatları Kılavuzu - Sayfa 42

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Additional Information

Dolby Digital

Dolby Digital is a compression format which records the

sound of 6 channels of the theater surround system

(Dolby Digital) on the movie film digital track. Of the 6

channels, the sub woofer channel is intended for bass

only, and because the frequency range is smaller than

the main channel, it is expressed as 5.1 channel.

Dolby Digital is the name of the Dolby surround multi-

channel digital system that was developed after the

Dolby Surround System and Dolby Pro Logic Surround

System.

5.1 channel digital

surround track

Dolby

Digital

encoding

Dolby Digital for motion picture

The number of movies made using Dolby Digital since

1992 has exceeded 300 and continues to increase. For

compact disc players and laser disc digital sounds, 16

bits are used to sample the original analog audio

waveform and sampling is carried out 44,100 times every

second. However because an enormous amount of

recording signal data is required for the multi channel

system with this method, AC-3 is used to compress the

data.

No. of recorded channels

No. of playback channels

Playback channel structure

Sound processing

Rear (Surround) high

frequency playback limit

Other

4 channel analog

sound track (Matrix)

Dolby Digital

5.1 channels (Max.)

Front Left, Front Right, Center, Surround Left,

Surround Right, Sub Woofer

Digital discrete processing

20,000 Hz

• 5.1 completely independent channels

• High dynamic range

• Stable position, high phase characteristics, and

advanced surround effects reproduction

• High efficiency

(Compression rate of about one-tenth)

In reproducing audio signals, the smaller the bit number

used, the lower the sound quality. With AC-3, drop in

auditory sound quality is prevented by using masking

technology and digital filtering technology based on the

human auditory characteristics.

Laser disc format

Laser discs are now available on the market in large

numbers. This means that the recording of different

format audio signals on the laser disc raises the

important question of compatibility with existing laser

discs. Dolby Digital tracks on Laser Discs record signals

using the space of one analog audio channel so it will

maintain compatibility with existing discs and players.

As shown in the following figure, the digital audio

sounds of Dolby Digital discs can be played back as

currently done. Analog sounds are played back by using

the other channel without the Dolby Digital signals for

monaural audio signals.

Dolby Digital

Analog sound

sound

(Monaural)

Digital

sound

Comparison with Dolby Pro Logic Surround

Dolby Digital is also known as the 5.1 channel system. It

is equipped with 5 channels (front left, front right, center,

surround left, surround right) in the frequency range

from 20 Hz to 20 kHz and an independent Low Frequency

Effect (LEF) channel. The sub woofer channel is also

called Low Frequency Effect (LFE).

The subwoofer channel can be used as desired to enjoy

strong bass sounds.

The following table shows the comparison with Dolby

Pro Logic Surround effects.

Dolby Pro Logic Surround

2 channels

4 channels

Front Left, Front Right, Center,

Surround

Analog matrix processing

7,000 Hz

Video

Frequency

14 MHz