Digital Filter Design & Algorithm Implementation with Embedded Signal Processors
Electronic systems deal with signals that have a frequency spectrum with
a wide range of frequency components. These frequency components
require filter functions that may include isolation, rejection or attenuation
depending on system implementation. Digital filters are systems that
modify certain frequencies relative to others either by a digital computational
process or by implementation of an algorithm. A band-limited signal which
is continuos-time is sampled at the Nyquist rate and converted to
discrete-time by a digital filter. This paper deals with the design of digital
filters which include specification, approximation and realization of the
desired properties of a causal discrete time system using a new generation
of Intel 80C196 embedded controllers with digital signal processing
capabilities. The 80C196, in addition to its register to register architecture,
has a hardware based accumulator and multiply accumulate instructions
suitable for signal processing. Key features of the instruction set to
perform signal processing functions are described. Fast I/O operations
and software implementation of digital filters in hard disk drive servo
operations, optimized for performance and memory are discussed, along
with a high level overview of both the architecture and software are
discussed.
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