Digital signal processing arrangement

Details Digital signal processing arrangement Digital signal processing arrangement

H - Electricity

03

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354/68, 328/0.3

H03M 3/04 (2006.01) G06F 17/15 (2006.01) H03H 17/02 (2006.01) H03M 7/36 (2006.01) H04B 3/23 (2006.01) H04L 27/04 (2006.01)

Patent

CA 1110769

ABSTRACT: Digital signal processing arrangement such as a digital filter for computing output signal samples which are each equal to the sum of products of a given plurality of pairs (for example N) of input signal samples. One of the input signal samples of the pair is, for example, formed each time by a sample x(n) of a digital signal to be fil- tered, the other input signal sample of the pair by a fil- ter coefficient z(n), wherein either the sample x(n) or the filter coefficient z(n) can assume only a limited number of values O, ?A1, ?A2, ... ?AM, M being much smaller than N. In the case x(n) can assume only this limited number of values, z(n) is first multiplied, owing to the x(n) be- longing to the pair, by the sign of x(n) for generating a product of the form z(n).sgn [x(n)] . In-dependent of the magnitude of x(n) this product is applied to an accumulator which corresponds with this magnitude of x(n). After all N products have been applied to one of the M accumulators the partial sums stored therein are multiplied by the mag- nitude ¦x(n)¦ corresponding therewith and the products obtained are added together. -24-

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