H A R D W A R E I N S T A L L A T I O N
C H A P T E R 1
Sampling Rate and Buffer Size
Figure 13: FlexRadio Control Panel Sample Rate, Buffer Size and Operation Mode Settings
To set the sample rate and buffer size
1
, click on the
Bus
button at the top left (Figure 13). These
settings depend on the modes you primarily operate. For CW, minimum latency (smaller buffers) is
paramount; for digital and phone modes, larger buffers may increase stability, especially if using VAC
or other third-party audio programs.
The lower the sample rate, the smaller the buffer size can be to achieve the same overall
system latency.
The minimum buffer size at a certain sample rate depends on the available computing power:
smaller buffers require more interrupts per unit of time (audio dropouts are an indication of too
low a buffer size). Given a sample rate, the minimum buffer size is limited by the Operation
Mode setting.
1
Do not confuse this audio buffer size with the DSP buffer size (see page 82). The former applies to the transfer of samples
from the radio to/from the computer; the latter applies to the transfer from the time to the frequency domain in the software.
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2003-2009 FlexRadio Systems
