Table 2: Overview of the average CPU load, memory usage, and required network bandwidth of the Alix single-board computer when audio is preprocessed on the sensornode side.

FFT input length CPU load Memory usage Network bandwidth
(s) (%) (MiB) (Bytes/s)

0.125 57.5 1.8 355
0.25 42.8 1.8 177
0.5 16.3 2.0 88
1 2.1 2.2 45