H - Electricity – 04 – J
Patent
H - Electricity
04
J
363/7
H04J 1/12 (2006.01) H04L 5/06 (2006.01)
Patent
CA 1071779
A MULTI-CHANNEL MULTIPLEX DATA TRANSMISSION SYSTEM ABSTRACT OF THE DISCLOSURE The sum and the difference signals of a pair of data channels are applied to a pair of roll-off filters, respectively. The outputs of said roll-off filters are modulated by a pair of carrier signals which have the phase difference ? to each other. The modulated signals are added to each other in an adder and a single output signal is provided from the output of said adder. Said output signal and another output signal relating to another pair of data channels, and some pilot signals are applied to an adder, the output of which is transmitted to a receiving station in the form of a multi-channel multi- plex data signal. At the receiving station, the received signal is demodulated with the inverse process of the above modulation steps and the demodulated data signals are applied to an automatic equalizer. The present invention described above provides high speed data trans- mission through a narrow-band-line which has only almost the Nyquist band width. - 1 -
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