device for filtration of the compressed pulskodmodulerade signals

摘要

Digital filter for filtering nonuniformly quantized pulse code-modulated signals formed by a sequence of code words each comprising a segment number s(i) and a mantissa number m(i). This digital filter comprises a modifying device to which the mantissa numbers m(i) are applied for generating modified mantissa numbers E(i). The numbers E(i) are each multiplied by the magnitude of a filter coefficient, for generating first product numbers z1(i). Thereafter these numbers z1(i) are each multiplied by a number 2B(i), B(i) being either equal to s(i) or equal to s(i)-1, so that second product numbers z2(i) are obtained which are applied to an accumulator.