H - Electricity – 04 – B
Patent
H - Electricity
04
B
354/232
H04B 3/20 (2006.01) H04B 3/23 (2006.01) H04L 5/14 (2006.01) H04L 25/49 (2006.01)
Patent
CA 1093698
ABSTRACT: An arrangement for simultaneous two-way data transmission of data signals with a given symbol frequency over two-wire circuits of n type found in telephone networks or of a comparable type. The arrange- ment comprises an echo canceler with an adaptive filter for producing from transmit channel signals approximated echo signals which are differentially combined with re- ceive channel signals for forming substantially echo-free residual signals. A special type of code conversion is em- ployed in the transmit channel, whereby p-level data sym- bols are converted into modified p-level data symbols which are thereafter converted into (2p-l)-level data symbols. The echo canceler comprises a digital adaptive filter to which the modified p-level data symbols and the resi- dual signals with a sampling frequency equal to the symbol frequency are supplied. These measures result in a trans- mission signal having favourable spectral properties, a simple inverse code conversion and an echo canceler which combines simplicity of implementation with favourable con- vergence properties.
281115
Gerwen Petrus J. Van
Snijders Wilfred A.m.
Van Den Elzen Hendricus C.
N.v. Philips Gloeilampenfabrieken
Van Steinburg C.e.
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