H - Electricity – 04 – B
Patent
H - Electricity
04
B
325/15
H04B 1/38 (2006.01) H04L 27/02 (2006.01)
Patent
CA 1238086
ABSTRACT DATA TRANSMISSION USING A TRANSPARENT TONE-IN BAND SYSTEM When modems are used in SSB systems a problem arises in controlling variable data rates. If a transparent tone-in band system is used, the notch in the band transmitted will be required for a control signal for the SSB receiver. The present invention allows a further possibility for transmitting control signals, for instance one representative of data rate, by varying the width of the notch in the transmitter and determining notch width in the receiver. The notch width is controlled by frequencies applied to two mixers and reference signals for these mixers are derived by respective multipliers from a clock signal. In a receiver the process of restoring the original frequency spectrum also employs two mixers receiving signals from two oscillators. The frequency of one of the oscillators is controlled to ensure that lower and upper portions of the restored spectrum have the correct frequency and phase relationship. The width of the notch is determined by mixing the frequencies of the oscillators in the receiver, using a filter to select one side band, and a multiplier.
488452
Bateman Andrew
Mcgeehan Joseph P.
Fetherstonhaugh & Co.
National Research Development Corporation
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