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US 2003/0118186 A1Published application
Apparatus for and method for cipher check of an analog scrambler
OwnerJames E. Gilleyinventor
Life of this patent
Estimating the term…
Abstract
An apparatus and method for allowing an analog scrambler using an internal digital cipher to generate a pseudo-random number stream to drive the scrambling of the analog signal to be cipher checked, to add strength to the generation of the pseudo-random number stream, and/or to allow either analog scrambling of analog signals or digital encryption of digital signals. Digital connections are made directly to internal digital cipher to allow the foregoing functions.
Claims9
An apparatus to secure analog signals comprising:
- analog inputs to receive an analog source signal;
- an analog scrambler connected to the analog inputs, and having an input for receiving a pseudo-random number stream for driving the scrambler;
- a digital signal processor in which is implemented a digital cipher which operates as a pseudo-random number generator to create the pseudo-random number stream;
- a digital input and output from external of the scrambler to the digital signal processor to allow digital communication with the digital signal processor.
1 more element
A method for cipher checking an analog scrambler carrying:
- generating a pseudo-random number stream with a digital cipher;
- driving an analog scrambler with the pseudo-random number stream;
- directly accessing the digital cipher;
- performing a cipher check through the direct access.
1 more element
Dependencies are inferred from the claim text.