Patent
1977-01-10
1978-09-12
Claffy, Kathleen H.
H04J 310
Patent
active
041139879
ABSTRACT:
The invention concerns a method for improvement of the crosstalk attenuation between adjacent channels in a time division multiplex system, for example a PCM-system. The crosstalk will have contributions from both the transmitting and the receiving side of the system. The greatest part of the crosstalk arises during the sampling times in the transmitter and the receiver, due to residual charges from the sampling of the preceding channel. In order to carry out the method a modulo-2-adder is arranged in the coder or the decoder of the PCM-system. The modulo-2-adder is inserted in the connection associated with the polarity bit of the PCM-word between a series-parallel converter and a digital-analog-converter in the decoder, or between an analog-digital-converter and a parallel-series-converter in the coder, respectively. The adder also receives signals from a clock oscillator with half the word frequency. Through such arrangement the polarity bits of the PCM-words are inverted in every second channel, so that the phase-position of the decoded signal will change, whereby crosstalk signals originating from signals in adjacent channels will be neutralized.
REFERENCES:
patent: 3891806 (1975-06-01), Chatelon
Claffy Kathleen H.
Popek Joseph A.
Telefonaktiebolaget L M Ericsson
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