The functional blocks of the central controller module are
shown in Figure 6. At the central controller module
(coordinator), when data are received, the received bytes are
decompressed using DPCM algorithm [9]. Decompressed data
is assigned to the digital-to-analogue converter (DAC). The
analogue output of the DAC is filtered and fed to the computer
as analogue signal through the sound card of the PC. The filter
and amplifier circuit is shown in Figure 7.