Transmission system for sending two signals simultaneously on th

Details Transmission system for sending two signals simultaneously on th Transmission system for sending two signals simultaneously on th

1989-07-12

1991-12-17

Tarcza, Thomas H.

Pulse or digital communications

Repeaters

Testing

380 34, 380 46, H04K 100

Patent

active

050738992

ABSTRACT:
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 with the modulated speech lying within the bandwidth of the spread spectrum signal.
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 synchronizing signal may be included in the modulated signal prior to transmission and when recovered in the receiver, the synchronizing 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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