Pulse or digital communications – Repeaters – Testing
Patent
1982-12-06
1984-10-16
Griffin, Robert L.
Pulse or digital communications
Repeaters
Testing
358135, H03K 1322
Patent
active
044779151
ABSTRACT:
Differential pulse code modulation transmission system comprising a transmitter and a receiver. In the transmitter there is subtracted from an information signal x(n) to be transmitted, a prediction signal y(n) for the purpose of generating a difference signal e(n), which is quantized and converted into a quantized difference signal in a quantizing arrangement 6. This difference signal is applied to a prediction circuit 7 for generating the prediction signal. It is also transmitted to the associated receiver. In that receiver a similar prediction signal is generated by means of a similar prediction circuit, which prediction signal is now added to the received quantized difference signal. In order to limit the influence of transmission errors in this transmission system, without an excessive increase in equipment, the quantized difference signal is applied in the transmitter and in the receiver to a cascade arrangement of a non-linear network 16 and an auxiliary prediction circuit 17, which produces an auxiliary prediction signal. Before the quantized difference signal is applied to the prediction circuit, the auxiliary prediction signal is first added thereto.
REFERENCES:
patent: 3973199 (1976-08-01), Widmer
patent: 4292651 (1981-09-01), Kretz et al.
patent: 4411001 (1983-10-01), Van Buul et al.
Dukhovich "A Three-Dimensional Spatial Non-Linear Predictor for Television" IEEE Transaction on Communication May 1978, pp. 578-582.
Briody Thomas A.
Chin Stephen
Goodman Edward W.
Griffin Robert L.
Streeter William J.
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