ViewCast Osprey-300, Руководство пользователя

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Osprey-300 User’s Guide
Preferred Audio Sample Rate
The audio sample rate is the rate at which the
hardware samples the incoming audio, which
may differ from the sample rate delivered to the
client application.
The choice are to allow “Any Supported Rate”,
or to force the sampling rate to be 32 kHz,
44.1 kHz, or 48 kHz. If “Any Supported Rate”
is selected, all three rates, 32, 44.1, and 48
kHz, are available for selection by the Microsoft
kmixer driver. Kmixer, however, does not
necessarily select the optimum hardware rate for
a given software rate. It may specify a 44.1 kHz
hardware rate when a supplying 16 kHz software
rate to the application, for example. In this case
it would be better to set the Preferred Audio
Sample Rate 32 kHz, so that downsampling is
exactly 2:1.
When the audio input is SDI, the only sample
rate that the Osprey hardware supports is 48
kHz. The driver will override your setting here.
When the audio input is DV1394, you have to
use this control to match your audio sample rate
to the actual rate of the incoming data. The
two most common formats are 48 kHz / 16-bit,
and 32 kHz / 12-bit. You may have to listen to
a captured sample of your audio to determine
whether the sample rate is set correctly – if the
pitch is incorrect, try the other setting.
Mono Source Mode
This control determines which audio channel will
be the source when monaural audio is selected.
• If set to Use Left Channel, the mono
channel contains audio from the left input.
• If set to Use Right Channel, the mono
channel contains audio from the right
input.
• If set to Average Left and Right, the mono
channel contains the average of the two
inputs.