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Microcomputer-based real-time/online f.f.t. processor

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2 Author(s)
W. K. Luk ; University of Hong Kong, Department of Electrical Engineering, Hong Kong, Hong Kong ; H. F. Li

The fast Fourier transform (f.f.t.) has found wide applications in areas requiring the processing of uniformly sampled signals. This paper investigates the characteristics of using a standard, inexpensive micro-computer system to implement an f.f.t. processor operating in either real-time or online mode. Various aspects on the maximum sampling rate in either mode of operation, such as the limitation by the system input/output time and f.f.t. computation time, as well as the aliasing-free condition to process bandlimited periodic signals, are revealed. The sampling clock is made adaptive to the real-time signal. So the processor is capable of processing signals from d.c. up to the online aliasing frequency. An example of real-time/online line-voltage fault detection is also included.

Published in:

IEE Proceedings E - Computers and Digital Techniques  (Volume:127 ,  Issue: 1 )