User Manual

Multichannel Monitoring Tutorial Booklet (M2TB) rev. 3.5.2
Masataka Nakahara : SONA Corporation
©2005 YAMAHA Corporation, ©2005 SONA Corporation
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2-1. Surround processing methods
There are two types of surround processing method; “matrix” and “discrete.”
2-1-1. Matrix
This method uses phase synthesis technology to record a larger number of channels on a limited number
of tracks.
This means that for some channels, there may be restrictions in playback bandwidth and channel
separation (crosstalk).
Matrix processing is often used for analog recording where the number of tracks is limited, such as for the
analog tracks of a film, or on video cassette tape.
However in principle, it could also be applied to digital media such as CD.
Recently, 5.0 matrix formats using Dolby Pro Logic II have been used frequently in game media.
[Fig. 4] 3-1Matrix
[Fig. 5] 5.0 matrix
If the master source of the LFE channel contains the important information and it needs to be played back,
it should be mixed into L&R in advance.
Production
Playback by end-users
Media
Surround processing
C’(
≒
in-phase signal of Lt and Rt)
S’(
≒
anti-phase signal of Lt and Rt)
Master
Surround processing
Movie, VHS etc.
L
C
R
S
Lt (L total)
Rt (R total)
L
R
Production
Playback by end-users
Surround processing
Surround processing
Game etc.
L
C
R
(LFE)
Lt (L total)
Rt (R total)
L (+LFE)
C’
R (+LFE)
RS
LS
RS’
LS’
Media
Master