User Manual

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Multichannel Monitoring Tutorial Booklet (M2TB) rev. 3.5.2

Masataka Nakahara : 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

Lmix

＝

＋

Att1

Att2

±Att3

±Att4

LFE

±Att5

LS±

Att6

Rmix ＝±Att7×L＋Att8×R±Att9×C

±Att10×LFE±Att11×LS±Att12×RS

5.1ch Master

2ch Down-mix

Meta data

LFE

+ / -

Att1

Att7

Att8

Att2

Att3

Att9

Att4

Att10

Att5

Att11

Att6

Att12

Phase