System of numerical transmission with adaptative coding, of anal

Details System of numerical transmission with adaptative coding, of anal System of numerical transmission with adaptative coding, of anal

1981-11-13

1984-02-28

Safourek, Benedict V.

Pulse or digital communications

Spread spectrum

Direct sequence

371 70, 375 38, H04B 166

Patent

active

044344996

ABSTRACT:
A numerical or digital transmission system uses an adaptative coding, of log information, which is sampled and transformed by an orthogonal transformation. The coding has a rate of data flow or delivery, which is reduced by orthogonal transformation with an adaptative threshold. In each scanning field, the binary elements of the coefficients are obtained by a basic coding with a quantification pitch 2S, (S being a whole number either positive or null). A complementary coding is transmitted. The complementary coding is obtained by adding binary elements of weights 2S-1 for each one of the coefficients, until the transmission capacity of the channel is filled. The coefficients are taken in chronological order. The invention is applicable to digital television, but also the coding may be used for transmission of high fidelity sound.

REFERENCES:
patent: 4134134 (1979-01-01), Lux
patent: 4155097 (1979-05-01), Lux
patent: 4266249 (1981-05-01), Chai et al.
patent: 4346405 (1982-08-01), Yoda et al.

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