Telegraphy – Systems – Printing
Patent
1981-08-03
1983-08-30
Cangialosi, Salvatore
Telegraphy
Systems
Printing
178 2215, H04K 102
Patent
active
044018541
ABSTRACT:
In its most general form, the present invention may be employed to simultaneously transmit information, either digital or analog, from two separate and distinct sources, denoted A and B, where the information from at least one of the sources, for example, A, possesses some known statistical properties of coherence. The less coherent information from, for example, source B, is used to generate a set of scrambling key sequences, where each separate scrambling key sequence is associated with a unique segment of information from source B. The key sequences are used to scramble the information from source A, and the scrambled information is produced as the output of the transmitter. In one form, the information from source A could be an analog signal (x(t)) and the information from source B could be a digital data sequence ({d.sub.k }) which is capable of transmitting n data bits per every N samples of the analog signal from source A. In particular, each sequential block of N samples of the analog signal is scrambled in M unique ways (S.sub.1 -S.sub.M), where M=2.sup.n, and the M scrambled sequences are associated in a one-to-one relationship with the M possible combinations of data elements (d.sub.1 -d.sub.M) that could possibly be transmitted. The particular scrambled sequence (S.sub.i) associated with the data element desired to be transmitted (d.sub.i) is thus dispatched as the output signal (S.sub.T) of the transmitter. At the receiving end, the reverse processes take place, allowing the listener to recover information from both sources A and B.
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Bell Telephone Laboratories Incorporated
Cangialosi Salvatore
Pfeifle Erwin W.
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