Asus A7N8X Deluxe User Manual download pdf (Page 108)

Chapter 5: Software reference

5.7.8 Audio Glossary

Dolby

Surround is an audio encoding process. When a Dolby

Surround

soundtrack is produced, four channels of audio information — left, center,

right, and surround — are matrix-encoded onto two audio tracks. These two

tracks are then recorded onto stereo program sources, like videotapes and

TV broadcasts.

Dolby

Digital 5:1 (AC-3) is an audio encoding process that simulates the

illusion of total surround sound. The system consists of five speakers and

one bass unit, hence the name 5:1. Normally, the listener is faced by two

front speakers and surrounded by two rear speakers; both pair of speakers

supply full stereo output. An additional, center speaker, facing the listener, is

mainly used for dialogue between actors and actresses.

The Dolby

Digital 5:1 AC-3 coder is designed to take advantage of natural

human auditory masking. AC-3 coding is essentially a very selective and

powerful noise reduction filter. The coder system divides the audio spectrum

of each channel into narrow frequency bands of precise proportions, each

one optimized with respect to the innate frequency selectivity of human

hearing. Coding noise is filtered out by matching its frequency to the “blind

spots” of human hearing. By reducing coding noise, the sound quality of the

original signal can be preserved and enhanced.

S/PDIF: S/PDIF (Sony/Philips Digital Interface) is a standard audio transfer

file format. It is usually built-in to the digital processors of audio equipment

such as DAT recorders or audio processing devices. It facilitates transfer of

audio data from one file to another without conversion to and from the analog

format, which could degrade signal quality. The most common connector

used with an S/PDIF interface is the RCA jack, the same one used for many

consumer audio-visual products. An optical connector is also available.

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Asus A7N8X Deluxe User Manual Page 108