Reduced sample rate data acquisition system

Details Reduced sample rate data acquisition system Reduced sample rate data acquisition system

1979-04-23

1982-01-26

Stewart, David L.

Multiplex communications

Wide area network

Packet switching

370113, 364724, H04J 304

Patent

active

043131956

ABSTRACT:
A data acquisition system having plural input channels sampled at a first rate by a time division multiplexer applies the samples to a finite impulse response (FIR) discrete filter which generates output samples at a slower rate.
The filter forms a set of summations ##EQU1## where Z(t.sub.i) is an input sample at a time t.sub.i, H.sub.i is the i.sup.th value of the filter impulse response, p is a sequence of successive integers, 0, 1, 2, . . . , each of which corresponds to one output sample, K is the length of filter impulse response (number of samples for each output) and R is the ratio of the initial input sample rate to the desired sample rate. A 3 to 1 reduction ratio is achieved with K=31, with the filter forming 11 different overlapping summations, so that after start-up one filtered output sample is outputted after each successive group of 3 inputs. Coefficients and the summations are stored in ROMs and RAMs, and coefficient and memory locations are indexed by counters having a modulo equal to the next integer greater than K/R.

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