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: FLEX-5000 Control Panel Sample Rate and Buffer Size Settings
To set the sample rate and buffer size, click on the
Bus
tab at the top right (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 sampling 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 (see next section).
Table 8 below shows initial settings for the driver's Sampling Rate, Buffer Size and Operation Mode.
You should start with these values and if you desire you can experiment with other settings. In some
cases, where audio drop outs are being experienced, larger buffers may need to be used. Also, see
Appendix A for more detail.
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2003-2008 FlexRadio Systems
