Secure communication system

专利名称：Secure communication system发明人：Carl R. Nicolai,William M. Raike,David L.

Miller

申请号：US05/843800申请日：19771020公开号：US04188580A公开日：19800212

摘要：A secure communication system for transmitting and receiving an encodedinformation signal. The system generates at transmitting and receiving locations apredetermined unique pseudorandom code. A synchronized tracking signal is imposed onthe information to be transmitted and added to the information to form an intermediatesignal. The pseudorandom code is then multiplied by the intermediate signal directly sothat the ultimate result appears to assume the character of pseudorandom noise, whichis then transmitted to the receiving location. The synchronization and transmittedencoded portion is decoded at the receiver and used to generate a base signal for apseudorandom generator at the receiving location, as well as initiate initial clocking pulsetime for operation of the receiver pseudorandom generator. The receiver then generatesthe predetermined pseudorandom code and divides the same against the encoded signalbeing received to form an intermediate signal having no pseudorandom signal

component, which is then filtered to remove the tracking and masking signal and therebygenerating the original information signal desired.

申请人：TELESYNC CORP

代理机构：Flehr, Hohbach, Test et al

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