Sony STR-DA777ES User Manual download pdf (Page 61)

61

Additional Information

Glossary

Surround sound

Sound that consists of three elements:

direct sound, early reflected sound

(early reflections) and reverberative

sound (reverberation). The acoustics

of the surrounding space affect the

way these three sound elements are

heard. Surround sound combines

these sound elements in such a way

that you actually can sense the size of

the venue, as well as its type.

• Types of sound

• Transition of sound from rear speakers

Dolby Pro Logic Surround

As one method of decoding Dolby

Surround, Dolby Pro Logic Surround

produces four channels from two-

channel sound. Compared with the

former Dolby Surround system,

Dolby Pro Logic Surround reproduces

left-to-right panning more naturally

and localizes sounds more precisely.

To take full advantage of Dolby Pro

Logic Surround, you should have one

pair of rear speakers and a center

speaker. The rear speakers output

monaural sound.

Dolby Digital (AC-3)

This sound format for movie theaters

is more advanced than Dolby Pro

Logic Surround. In this format, the

rear speakers output stereo sound

with an expanded frequency range

and a subwoofer channel for deep

bass is independently provided. This

format is also called “5.1” because the

subwoofer channel is counted as

0.1 channel (since it functions only

when a deep bass effect is needed).

All six channels in this format are

recorded separately to realize superior

channel separation. Furthermore,

since all the signals are processed

digitally, less signal degradation

occurs. The name “AC-3” comes from

the fact that it is the third audio

coding method to be developed by

the Dolby Laboratories Licensing

Corporation.

Digital Cinema Sound

This is the generic name of the

surround sound produced by digital

signal processing technology

developed by Sony. Unlike previous

surround sound fields mainly

directed at the reproduction of music,

Digital Cinema Sound is designed

specifically for the enjoyment of

movies.

Reverberation

Direct sound

Early

reflections

Reverberation

Early reflection time

Early reflections

Direct sound

Time

Level

DTS

Digital audio compression technology

that the Digital Theater Systems, Inc.

developed. This technology conforms

to 5.1-channel surround. The rear

channel is stereo and there is discrete

subwoofer channel in this format. The

good channel separation is realized

because the all channel data is

recorded discrete and processed in

digital.

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