Telegraphy – Systems – Printing
Patent
1977-06-16
1978-09-26
Robinson, Thomas A.
Telegraphy
Systems
Printing
178 58R, H04B 320
Patent
active
041172779
ABSTRACT:
An arrangement for simultaneous two-way data transmission of data signals with a given symbol frequency over two-wire circuits of a type found in telephone networks or of a comparable type. The arrangement comprises an echo canceler with an adaptive filter for producing from transmit channel signals approximated echo signals which are differentially combined with receive channel signals for forming substantially echo-free residual signals. A special type of code conversion is employed in the transmit channel, whereby p-level data symbols are converted into modified p-level data symbols which are thereafter converted into (2p-1)-level data symbols. The echo canceler comprises a digital adaptive filter to which the modified p-level data symbols and the residual signals with a sampling frequency equal to the symbol frequency are supplied. These measures result in a transmission signal having favorable spectral properties, a simple inverse code conversion and an echo canceler which combines simplicity of implementation with favorable convergence properties.
REFERENCES:
patent: 3821494 (1974-06-01), Besseyre
patent: 3894200 (1975-07-01), Campanella et al.
patent: 4007341 (1977-02-01), Sourgens et al.
patent: 4024358 (1977-05-01), Virupaksha
Snijders Wilfred Andre Maria
van den Elzen Hendricus Christianus
Van Gerwen Petrus Josephus
Robinson Thomas A.
Steckler Henry I.
Trifari Frank R.
U.S. Philips Corporation
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