GXD8 Operational Manual
Rev 1.0
Audio
Genex Research Limited
Page 5
Audio
Audio Formats
This section describes how to configure the audio output section of the GXD8.
The following parameters can be adjusted;
Standard Input Format
AES.
Input/Output Formats Available Through Expansion Cards
AES (expansion card to provide 8 channel dual wire 192kHz output)
SDIF-2 output
SDIF-2 input
TDIF
ADAT
DSD (Direct Stream Digital) – input only
What is Direct Stream Digital?
DSD was invented and developed by the Sony Corporation. It is designed to remove
some of the potential artifacts introduced by the decimation filter in a conventional
analogue to PCM digital conversion process. The DSD modulator generates a
2.8224MHz bitstream per channel, which is a slightly larger bandwidth than for 24 bit
96kHz PCM audio.
AES Input Configuration
You can select single wire, dual wire or quad wire. The setting refers to the position of
consecutive samples within an audio carrier.
In single wire mode each consecutive audio sample for a given track is located within
that track. For the AES format this means that one AES cable can carry two tracks of
information.
Dual wire mode means that each consecutive audio sample is contained in adjacent
tracks. For the AES format this means that one AES cable can carry only one track of
information.
Quad wire mode means that successive audio samples rotate through four adjacent
tracks. For the AES format this means that two AES cables carry one track of
information.
In master clock mode:-
•
at 44.1kHz or 48kHz sample-rate, the AES output is single wire and the button is
disabled.
•
at 88.2kHz or 96kHz sample-rate, the AES output can be either single or dual
wire.
•
at 176.4kHz or 192kHz sample-rate, the AES output can be either dual or quad
wire.
In slave clock mode:
•
with an input clock of 44.1kHz or 48kHz, the AES output can be single, dual or
quad
•
with an input clock of 88.2kHz or 96kHz, the AES output can be single or dual