User`s guide

102 Audio Behavior
Dolby Digital bitstreams default to an audio rate to 48KHz.
Dolby Digital 5.1 Surround Sound
The DVM2 supports output of Dolby Digital 5.1 Surround Sound bitstreams as
well as standard 2 channel MPEG audio. The DVM2 does not default to Dolby
Digital mode, so read the Audio Formats section to understand how the unit
treats them differently and how to put the DVM2 into Dolby Digital Bistream
mode.
DVM2 Hardware Requirements
The DVM2 outputs a Dolby Digital 5.1 Surround Sound encoded bitstream on
the digital audio output on the rear of the unit. (The DVM2/L and DVM2/V do
not support this feature.) To decode the bitstream you will need an external
Dolby Digital decoder.
DVM2 Operating System Requirements
Dolby Digital 5.1 Surround Sound support was implemented in version 0.66 of
the DVM2 operating system. If you have an earlier version of the OS, you need
to upgrade your unit before you can use this feature. To get the latest DVM2
operating system, go to www.alcorn.com/products/dvm2/osupdate.html.
Analog Output
The DVM2 analog audio outputs are inactive when playing a video file with a
Dolby Digital audio bitstream.
Audio Stream ID (SID)
The DVM2 requires the Dolby Digital 5.1 Surround Sound stream to have an
MPEG stream ID of 0x80. This is generally the default used when producing
Dolby Digital bitstreams. If the stream ID of your Dolby Digital bitstream is not
0x80, no audio will be output.
Dolby Digital 5.1 Surround Multiplexing
We are often asked how to multiplex Dolby Digital bitstreams (also called AC-3
streams) into the MPEG-2 program stream. One program with which we have
had good success is called DVD Quick Builder. It is produced by
AuthoringWare Co. and can be purchased from BernClare Multimedia
(www.bernclare.com).