Adaptive prediction differential PCM-type transmission apparatus and
process with shaping of the quantization noise
    3.
    发明授权
    Adaptive prediction differential PCM-type transmission apparatus and process with shaping of the quantization noise 失效
    自适应预测差分PCM型传输装置和具有量化噪声整形的过程

    公开(公告)号:US4385393A

    公开(公告)日:1983-05-24

    申请号:US253159

    申请日:1981-04-10

    CPC分类号: H03M3/042

    摘要: A coding process for the adaptive prediction differential PCM type. An error signal e.sub.t is formed between a sample of signal y.sub.t to be coded and a prediction signal p.sub.t of said signal. The prediction signal p.sub.t is formed from restored signals y.sub.t and e.sub.t by two linear filtering operations, the first relating to N successive samples of y.sub.t and using coefficients A1.sub.t, A2.sub.t, . . . , AN.sub.t and the second relating to P successive samples of e.sub.t and using coefficients B1.sub.t, B2.sub.t, . . . , BP.sub.t, the coefficients A1.sub.t, A2.sub.t, . . . , AN.sub.t and B1.sub.t, B2.sub.t, . . . , BP.sub.t being sequentially adjusted at each time t so that the mean power of error signal e.sub.t is minimal. Instead of carrying out the prediction on the basis of signals y.sub.t and e.sub.t only according to the invention, use is also made of the real signal y.sub.t and the real error e.sub.t. A linear filtering of y.sub.t using the coefficients A1.sub.t, A2.sub.t, . . . , AN.sub.t, these coefficients affecting N successive samples of the signal y.sub.t, a linear filtering of e.sub.t using the coefficients B1.sub.t, B2.sub.t, . . . , BP.sub.t are performed. In addition, the quantities thus obtained are respectively weighted by two coefficients between 0 and 1 and not simultaneously zero.

    摘要翻译: 用于自适应预测差分PCM类型的编码过程。 在要编码的信号yt的采样和所述信号的预测信号pt之间形成误差信号等。 预测信号pt由恢复的信号yt和et由两个线性滤波操作形成,第一个与nt的连续样本相关,并且使用系数A1t,A2t。 的。 的。 ANt,第二个涉及et的P个连续样本,并使用系数B1t,B2t,...。 的。 的。 ,BPt,系数A1t,A2t,。 的。 的。 ,ANt和B1t,B2t,。 的。 的。 BPt在每个时间t被顺序地调整,使得误差信号等的平均功率最小。 代替根据本发明的基于信号yt和et的执行预测,也可以使用实际信号yt和实际误差等。 使用系数A1t,A2t,...进行线性滤波。 的。 的。 ANt,这些系数影响信号yt的N个连续样本,使用系数B1t,B2t的线性滤波。 的。 的。 ,执行BPt。 另外,这样获得的量分别由0和1之间的两个系数加权而不是同时为零。