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EXPERT

Techno Tidbits & Problem-solving

5.1 channel

4 channel analog

Dolby

Digital

Dolby Digital for movie

Soundtracks using linear PCM audio generate too much

data for multichannel use. Dolby Digital technology was

developed in response to the need for efficient

multichannel digital sound. It uses masking technology and

Adaptive Transform Coding, resulting in no audible loss of

sound quality. In the present age of digital sound Dolby

Digital is a standard audio format for DVD and has been

adopted by HDTV broadcasts throughout the USA.

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).

The advantages of the Dolby Digital system of encoding

allow it to maintain its high quality sound while at the same

time being very flexible, with the ability to handle many

different types of soundtracks.

Dialog Normalization

When a Dolby Digital soundtrack is played back the Dialog Normalization function of the amplifier activates auto-

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

source being played. If the amplifier's level does not match the average dialog level, first you see "DIAL NORM"

and "OFFSET +4 dB" (as an example) appear in the amplifier's display. In this example, the number +4 dB is the

difference between the amplifier'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.

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