Sony STR-DA777ES - Manual (Page 61)

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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.