H - Electricity – 04 – B
Patent
H - Electricity
04
B
328/0.3
H04B 14/04 (2006.01) H03H 17/06 (2006.01)
Patent
CA 1114460
ABSTRACT Digital filter for filtering non-uniformly quan- tised pulse code modulatad signals formed by a sequence of code groups x(i), each comprising a polarity bit, a segment number and a mantissa number. This digital filter arrange- ment comprises a generator which cyclically generates a series of sequentially occurring auxiliary numbers each comprising a polarity bit and an address code; a first storage medium for storing the code groups x(i) and con- trolled by an address computation circuit to which the aux- iliary numbers are applied; a second addressable storage medium to which a segment number s(i-h) a mantissa number m(i-1), supplied by the first storage medium, as well as a polarity bit supplied by an exclusive OR-gate are applied as the address code. This polarity bit is derived by gate from the polarity bit p(i-1) of the code groups x(i) and the auxiliary numbers polarity bit. This second storage medium contains positive numbers zp and negative numbers zn which represent the expanded values of all possible code groups x(i). A positive number zp is read from the storage medium if the polarity bit is positive and a neg- ative number is the polarity bit is negative. The numbers read from the storage medium are applied to an accumulator which is coupled to an address code output of the gener- ator. - 22 -
321699
N.v. Philips Gloeilampenfabrieken
Van Steinburg C.e.
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