FlexRadio Systems Flex-3000 User Manual

B U F F E R S A N D S A M P L E R A T E A P P E N D I X A
Figure 172: 25Hz CWL Filter at 48kHz Sample Rate
Latency Effects
The latency in the system will be at least equal to the minimum of the Audio and DSP Buffer Sizes
divided by the Sample Rate. Because both the DSP Buffer and the Sample Rate also determine the
minimum filter width, setting the Audio Buffer as small as your computer system will tolerate is
preferable. That way, latency will not be unnecessarily long. If latency is an issue with your computer
system, you may have to resort to a smaller Buffer Size and/or a higher Sample Rate than you would
otherwise prefer based on filter shapes.
Underlying Theory
To transform signals from the time domain to the frequency domain we start with the Discrete Fourier
Transform (DFT), which is the Fourier Transform for time sampled signals (The FFT or Fast Fourier
Transform is an efficient algorithm to calculate the DFT). It is important to realize that the result of the
DFT is a continuous function of the frequency, from –infinity to +infinity. The annoying thing about this
175  2003-2009 FlexRadio Systems
Figure 173: 25Hz CWL filter at 96kHz Sample Rate
DSP Buffer Sizes:
Red – 512
Green – 1024
Blue – 2048
Black - 4096
DSP Buffer Sizes:
Red – 512
Green – 1024
Blue – 2048
Black - 4096

FlexRadio Systems Flex-3000 Specifications

General

Brand	FlexRadio Systems
Model	Flex-3000
Category	Transceiver
Language	English