Adaptive prediction differential PCM-type transmission apparatus

Details Adaptive prediction differential PCM-type transmission apparatus Adaptive prediction differential PCM-type transmission apparatus

1981-04-10

1983-05-24

Safourek, Benedict V.

Pulse or digital communications

Repeaters

Testing

332 11D, 375 26, H04B 1204

Patent

active

043853935

ABSTRACT:
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.

REFERENCES:
patent: 4141034 (1979-02-01), Netralavi et al.
patent: 4319082 (1982-03-01), Gilloire et al.

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