
What is an embedded system? 7
instruction execution time. It shows that the faster the sampling
frequency, the more processing power is needed. To achieve the 1
MHz frequency, a 10 MIPS processor is needed whose instruction
set is powerful enough to complete the processing in under 10
instructions. This analysis does not take into account A/D conver-
sion delays. For DSP algorithms, the sampling speed is usually
twice the frequency of the highest frequency signal being proc-
essed: in this case the 1 MHz sample rate would be adequate for
signals up to 500 kHz.
One major difference between analogue and digital filters is
the accuracy and resolution that ...