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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2-5-3. Two-channel fold-down for DVD-Audio
[Fig. 18] Flow of a Down mixing : DVD-Audio
DVD-Audio down-mixing circuits have full matrix mixer functionality consisting of twelve attenuators
and ten phase switches. The attenuation values can be set in detailed steps of either 0.2 dB or 0.4 dB.
Since default values are not specified for each parameter, the parameters must be specified as meta-data
when encoding and stored on the disc in order for the player to perform a down-mix to two channels
(fold-down). DVD-Audio, on the other hand, allows you to record meta-data that prohibits down-mixing
by the player, and in this case, a separate two-channel mix should be recorded on the disc.
Incidentally since Super Audio CD does not have a down-mixing circuit as described above, two-channel
mix material must always be recorded on the disc.
The surround monitoring functionality of the Yamaha DM2000, DM1000, and 02R96 digital consoles
provides down-mixing circuitry that complies with Lo/Ro down-mixing for DVD-Video (Dolby
Digital, DTS) and digital broadcast (Japan, MPEG-2 AAC), allowing you to check the down-mix
playback immediately.
The values of attenuation meta-data for down-mixing can also be adjusted, allows you to determine the
appropriate attenuation values for each production.
■
Att1
〜
Att12
1.000 (0dB)
〜
0.001 (-60dB), 0.000 (-
∞
dB)
※0.2dB-step （0〜-40dB）
※0.4dB-step （-40〜-60dB）
■Default
N/A
L
Lmix
＝
＋
Att1
×
L
±
Att2
×
R
±Att3
×
C
±Att4
×
LFE
±Att5
×
LS±
Att6
×
RS
Rmix ＝±Att7×L＋Att8×R±Att9×C
±Att10×LFE±Att11×LS±Att12×RS
C
R
5.1ch Master
2ch Down-mix
Meta data
LFE
RS
LS
+ / -
+ / -
+ / -
+ / -
+ / -
+ / -
+ / -
+ / -
+ / -
+ / -
Att1
Att7
Att8
Att2
Att3
Att9
Att4
Att10
Att5
Att11
Att6
Att12
Phase