发明名称 |
DIGITAL FILTER ARRANGEMENT |
摘要 |
Digital filter for filtering non-uniformly quantised pulse code modulated 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 arrangement 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 1 for storing the code groups x(i) and controlled by an address computation circuit 13 to which the auxiliary numbers are applied; a second addressable storage medium 2 to which a segment number s(i-h) a mantissa number m(i-l), supplied by the first storage medium 1, as well as a polarity bit supplied by an exclusive OR-gate 3 are applied as the address code. This polarity bit is derived by gate 3 from the polarity bit p(i-l) of the code groups x(i) and the auxiliary numbers polarity bit. This second storage medium 2 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 2 if the polarity bit is positive and a negative number is the polarity bit is negative. The numbers read from the storage medium 2 are applied to an accumulator 4 which is coupled to an address code output of the generator 7. |
申请公布号 |
AU4433179(A) |
申请公布日期 |
1979.08.30 |
申请号 |
AU19790044331 |
申请日期 |
1979.02.16 |
申请人 |
PHILIPS' GLOEILAMPENFABRIEKEN, N.V. |
发明人 |
LUDWIG DESIRE JOHAN EGGERMONT |
分类号 |
H03H17/00;H03H17/02;H03H17/06;H04B14/04 |
主分类号 |
H03H17/00 |
代理机构 |
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代理人 |
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主权项 |
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地址 |
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