Channel 1, 2, 3, 4 Audio; Firefly Audio Configurations - Visual Circuits Firefly User Manual

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Channel 1, 2, 3, 4 Audio

On a channel by channel basis, Firefly gives you several audio
output options depending on the configuration you use (see Table 5
below). Standard MPEG layer-2 files will output from both the
digital and stereo analog outputs. Dolby Digital (AC3) files will
output from the digital outputs only. However, by using the
optional Dolby Digital Smart Card, you can "mix down" AC3 files
to the stereo analog outputs. If your application requires a 2-
channel (stereo) mix of AC3, please contact a Visual Circuits
representative for more information.
Config MPEG Audio Type
MPEG Layer 2
1
Stereo Audio
MPEG Layer 2
2
Stereo Audio
Dolby Digital Audio
3
(AC3)
Dolby Digital Audio
4
(AC3)
Table 5. Firefly Audio Configurations
NOTE
Firefly Dolby Digital D/A decoding is only available when
using the optional Dolby Digital Smart Card (config #4).
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Firefly Audio Configurations

Firefly Audio
Setting:
Dolby Digital
Stereo PCM
Dolby Digital
Stereo PCM (w/opt
Upgrade)
Digital Stereo Analog
Output
S/PDIF
S/PDIF
S/PDIF (Dolby
Digital)
S/PDIF Stereo Yes (Decoded)
Output?
Yes
Yes
No