Interpolating digital filter

Details Interpolating digital filter Interpolating digital filter

G - Physics

06

F

328/0.3

G06F 7/38 (2006.01) H03H 17/06 (2006.01)

Patent

CA 1039364

ABSTRACT Non-recursive digital filter producing binary out- put code words at an output sampling frequency "f2" which are related to a sequence of binary input code words which occur at an input sampling frequency "f1", "f2" being an integral multiple (m) of "f1". A storage device is arranged to store a given number (N) of successive input code words and a mult- iplying device is used to form, within one input sampling period l/f1, a number (m) of sets of products of (N) and a number (M) of different sets of weighting factors which correspond to the relationship between the input and output code words. An ad- ding device is coupled to the multiplying device and arranged to generate, within on input sampling period l/f1, a number of output code words which number corresponds to the number of sets of products. Each output code word is at least equal to the mathematical sum of all of the products, of a particular set of products. The storage device is controlled by a clock pulse generator and has a periodically varying storage time. This storage device is provided with an output circuit via which, within one sampling period l/f1, the input code words stored in the device are supplied to the multiplying device a number of times (m) whilst the code words supplied by the output circuit occur sequentially. -31-

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