User's Guide HDSPe MADIface
© RME
23
13. Operation under ASIO
13.1 General
Start the ASIO software
and select
ASIO Hammer-
fall DSP
as the audio I/O
device. The 'ASIO system
control' button opens the
HDSP's Settings dialog
(see chapter 11, Configu-
ration).
At a sample rate of 88.2 or
96 kHz (Double Speed
mode), the number of
channels available at the
MADI input and output is
halved. At a sample rate of
176.4 or 192 kHz (Quad
Speed mode), the number
of channels is reduced to
16.
13.2 Channel Count under ASIO
The MADIface allows the use of sample rates up to 192 kHz via the MADI interface. For this to
work single-channel data is spread to two or four channels using the
Sample Multiplexing
tech-
nique. Therefore the number of channels is reduced to 32 or 16 respectively.
Please note that when changing the sample rate range between Single, Double and Quad
Speed the number of channels presented from the ASIO driver will change too. This may re-
quire a reset of the I/O list in the audio software, and will require a reassignment of the channels
within the project.
Mono channels
Double Speed
Quad Speed
MADI (1 to 16)
MADI (1 to 16)
MADI (1 to 16)
MADI (17 to 32)
MADI (17 to 32)
MADI (17 to 32)
MADI (33 to 64)
MADI (33 to 64)
MADI (33 to 64)
13.3 Known Problems
If a computer does not provide sufficient CPU-power and/or sufficient PCIe-bus transfer rates,
then drop outs, crackling and noise will appear. We recommend to deactivate all PlugIns to
verify that these are not the reason for such effects.
Additional hard disk controllers, both on-board and PCI based, often violate the PCI specs. To
achieve the highest throughput they hog the PCI bus, even in their default setting. Thus when
working with low latencies drop outs (clicks) can occur. Try to solve this problem by changing
the default setting of the controller (for example by reducing the 'PCI Bus Utilization').
Another common source of trouble is incorrect synchronization. ASIO does not support asyn-
chronous operation, which means that the input and output signals not only have to use the
same sample frequency, but also have to be in sync. All devices connected to the Hammerfall
DSP must be properly configured for Full Duplex operation. As long as SyncCheck (in the Set-
tings dialog) only displays
Lock
instead of
Sync
, the devices have not been set up properly!
Summary of Contents for Hammerfall HDSPe MADIface
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Page 35: ...User s Guide HDSPe MADIface RME 35 User s Guide HDSPe MADIface Connections and TotalMix...
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