Transmission system for sending two signals simultaneously...

Details Transmission system for sending two signals simultaneously... Transmission system for sending two signals simultaneously...

H - Electricity

04

M

363/2, 325/43

H04M 11/06 (2006.01) H04B 1/66 (2006.01) H04B 1/707 (2006.01) H04B 7/00 (2006.01) H04K 1/04 (2006.01)

Patent

CA 1320770

PHB33478 ABSTRACT TRANSMISSION SYSTEM FOR SENDING TWO SIGNALS SIMULTANEOUSLY ON THE SAME COMMUNICATIONS CHANNEL A transmission system in which a suitably modulated speech or data signal is combined with a low bit rate (100b/s) spread spectrum signal and transmitted simultaneously on the same channel. At a receiver the modulated speech or data signal is demodulated and the modulated speech or data signal together with the spread spectrum signal are applied to a multiplier in which the spread spectrum signal is despread. A code synchronising signal may be included in the modulated signal prior to transmission and when recovered in the receiver, the synchronising signal is applied to a pseudo-random code generating means. The transmission system may include a text transmission system in which case the low bit rate signal comprises pages of data. A number of pages may be transmitted simultaneously by spreading the data associated with each page by orthogonal psuedo-random codes.

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