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Techno Tidbits and Problem-solving

Dolby

Dolby Digital

Dolby Digital is a discrete digital surround format used for multichannel surround sound. It was developed after the

Dolby Surround System and Dolby Pro Logic Surround System. Dolby Digital is a high quality digital sound format

that is used by many theatrical film releases.

Other features include:

1) Downmixing on playback for compatibility with mono, stereo, Dolby Pro Logic and 5.1 channel audio.

2) A wide range of bitrates and channels.

3) Decoding dynamic range information and adjusting the dialog level in the soundtrack (called Dialog

Normalization, see below for more information).

Dialog Normalization

When a Dolby Digital soundtrack is played back the Dialog Normalization function of the receiver activates

automatically. Dialog Normalization is a Dolby Digital function that establishes the average dialog level for the

program source being played. If the receiver’s level does not match the average dialog level, first you see “DIAL

NORM” and “OFFSET +4 dB” (as an example) appear in the receiver’s display. In this example, the number +4 dB is

the difference between the receiver’s gain structure and the Dolby Digital average dialog level. To match the average

dialog level, subtract or add the OFFSET level. For example, if the OFFSET level is +4 dB, the amplifier’s output is 4

dB over the average recorded level.

Dolby Pro Logic II

Dolby Pro Logic II is an improved version of Dolby Pro Logic technology with extended matrix decoding technology

that can create 5.1 channel sound from two channel sources. Dolby Pro Logic II creates basic 5 channel sound by

using the innovative “steering logic” circuit. Therefore when listening to typical two-channel sources like CD, the

listener can enjoy a richer spatial effect. When using software encoded with Dolby Surround, this decoding system

affords the listener an improved surround experience with greater sound detail.

Chart Comparing Dolby Pro Logic and Dolby Pro Logic II

Dolby Digital Surround EX

This new recording technology is able to play 6.1 channel sound and was developed in a collaboration between

Dolby Laboratories and Lucasfilm, Ltd. for the film “Star Wars: The First Episode”, the first movie ever to be made

with Dolby Digital Surround EX technology. In a movie theater this format affords the listener vivid surround sound

experience replete with the effect of sounds flying overhead, even for those seated towards the sides of the theater.

Dolby Digital Surround EX contains surround back channels which are dubbed into the soundtrack in studio. The

channels are encoded into the left and right channels of the soundtrack so this format can be compatible with

Dolby Digital 5.1 channel decoding. For a list of movies that contain Dolby Digital Surround EX soundtracks see

Dolby website at: http://www.dolby.com

DTS

In this system, 6 channels of digital sound are recorded on CD-ROM. DTS adopts a simultaneous playback format.

With a low rate of compression of sound signals and a high rate of transmittance, a higher sound quality format is

produced. For this reason, the format is being introduced in more and more movie theaters, and is being adopted

for home use as DTS Digital Surround. When used with movies it’s called DTS-LD DVD and for music software (5.1

channel CD) as DTS-CD.

Pro Logic Pro Logic II

Effective sound source Dolby Surround encoded sources All two channel stereo sources

Surround Sound Mono Stereo

Frequency Range Surround within 7kHz All Channels/Full Range

Techno Tidbits and Problem-solving

00_VSX-AX3.book Page 94 Monday, May 19, 2003 1:05 PM

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