System for data transmission through the channels of a frequency

Details System for data transmission through the channels of a frequency System for data transmission through the channels of a frequency

1975-10-17

1977-04-26

Claffy, Kathleen H.

H04J 108

Patent

active

040202887

ABSTRACT:
Parallel data transmission system in which the data signals are converted to multilevel digital signals and transmitted through the channels of a frequency division multiplex system. To compensate for the delays between the data signals received in the various channels of the multiplex, a pilot signal is transmitted in each channel in the form of a signal which only has a real component. At the receiver side a filter circuit is used which comprises a first fixed coefficient part at whose input the data signal is multiplied by a component of the received pilot signal and a second part having two variable coefficients which are derived from the two components of the received pilot signal.

REFERENCES:
patent: 3733438 (1973-05-01), Haley
patent: 3872257 (1975-03-01), Bleickardt
patent: 3912870 (1975-10-01), Roy

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