User Manual

Multichannel Monitoring Tutorial Booklet (M2TB) rev. 3.5.2

Masataka Nakahara : SONA Corporation

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[When reproducing monaural surround (S) from LS and RS] DVD-Audio Software Production

Guidebook (Supplemented Edition)

If no independent speaker is provided at a location corresponding to monaural surround (S), it is usual to

adjust S by -3 dB and distribute it to LS and RS for playback. In most cases at present, the player does not

have an analog output for the S channel separately from LS and RS, so this distribution is performed

within the player, and the S signal is sent from the analog LS and RS outputs. If the player does have an S

channel output, or if the S channel is being conveyed by a multi-channel digital stream via IEEE 1394 etc.,

the amplifier performs the above distribution processing.

Monaural surround in Super Audio CD

Super Audio CD does not provide monaural surround as a format. This means that if you are producing

monaural surround for Super Audio CD, you will need to mono-mix the S channel to LS and RS at the

appropriate level in the stereo surround (LS, RS) environment.

5.1 (6 ch) is the basic multichannel format for Super Audio CD; other formats are supported by recording

digital mute signals for unused channels as well as setting mute flags. This means that the same playback

environment can be applied for all channel formats of Super Audio CD.

2-4-4. Broadcast: Dolby DIGITAL, DTS, MPEG-2, MPEG-2 AAC

In the case of Dolby DIGITAL or DTS, the DVD-Video playback response is used.

In the cases of MPEG-2 and MPEG-2 AAC, the response is defined by the administrative body (LFE

channel handling in particular). For MPEG-2 (digital broadcast, Europe), the ISO standard limits the LFE

recording bandwidth to 125 Hz, but the playback level is defined by the administrative body. For the LFE

of MPEG-2 AAC (digital broadcast, Japan), full-band recording is possible according to the ISO/IEC

specification. However in some cases, bandwidth limitations may occur during propagation (ISO/IEC). In

actual operation, bandwidth limitation and playback level is defined by the ARIB (Association of Radio

Industries and Businesses). In the cases of MPEG-2 and MPEG-2 AAC, the playback level of LS and RS

for monaural surround (the S (LS+RS) channel in 3-1) must also be as specified by the administrative

body.

2-4-5. GAME

Audio for games falls in two categories; multi-channel playback for the “movie” portion of role-playing

games etc., and “interactive” multi-channel playback that occurs in response to movements within the

game.

These multi-channel formats will depend on the audio processing method used by each manufacturer.

Currently, Dolby DIGITAL or DTS are widely used.

In this case, the playback environment will be as described for DVD-Video.

The Ya maha DM2000, DM1000, and 02R96 digital consoles support these various playback environments

by providing LFE boost functions and LS/RS attenuation functions in the bass management section of their

surround monitor functionality, making it possible to switch instantly between playback environments.