Audio transmission protection apparatus

Details Audio transmission protection apparatus Audio transmission protection apparatus

1975-12-17

1977-03-08

Birmiel, Howard A.

Telegraphy

Systems

Printing

178 22, H04K 102

Patent

active

040114082

ABSTRACT:
In delay module means, an input signal is divided into a number of subsignals, each separated from the others by a selected time delay. In a primary module the subsignals are selectively weighted and combined with the input signal. In the inverse module, the signal is similarly differentially delayed and weighted, and subtracted from the input by feedback loop means. Audio signal scrambling is accomplished by passing the signal through one or more primary and/or inverse modules in series; descrambling is accomplished by passing the scrambled signal through a complementary series of modules. Frequency translation and/or inversion is also applied for applications requiring increased security.

REFERENCES:
patent: 3370126 (1968-02-01), Scidmore
patent: 3515805 (1970-06-01), Fracassi et al.
patent: 3784743 (1974-01-01), Schroeder
patent: 3879578 (1975-04-01), Wildi

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