S E T U P F O R M C H A P T E R 4
Audio Tab
Primary Sub-Tab
Figure 70: Setup Form - Audio Tab, Primary Sub-Tab
Buffer Size
You should set your audio Buffer Size as low as your computer system will tolerate. Larger buffers
mean more delay, but smoother audio. Smaller buffers yield less latency, but at the cost of CPU load.
The 2048 sample buffer size means that a single buffer at 48kHz sample rate is 2048/48000 = 42.7ms
in length. Faster machines should be able to run with a buffer size of 512 without issue at the lower
Sample Rate settings (see below). For best CW performance (and if your computer can handle it), set
the audio buffer to 512 or less. (see also the DSP Buffer Size on page 82).
Sample Rate
The sample rate can be set to 48kHz or 96kHz. Using the higher sample rates will result in a wider
frequency range in the panadapter and waterfall displays. Higher sample rates at a given buffer size
will reduce the latency in the system, but at the same time widen the filter skirts. It is this trade-off
that needs to be made, especially for CW where latency is more critical.
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71 2003-2009 FlexRadio Systems
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