Cryptography – Electric signal modification – Including particular structure or housing
Patent
1997-03-24
1998-07-28
Gregory, Bernarr E.
Cryptography
Electric signal modification
Including particular structure or housing
380 6, 380 8, 380 9, 380 33, 380 49, H04L 900
Patent
active
057871809
ABSTRACT:
An apparatus and method for voice privacy for cellular phones includes generic connection points to make it universal for most cellular phones. The connection points include the speaker and microphone and the microphone input and speaker output of the cellular phone. A scrambling or encryption circuit or process is used to secure the audio before it is transmitted over the network, and the unsecured audio once received. Side-tone added by the cellular phone and network echo of the scrambled audio to be transmitted is removed by, for example, adaptive echo cancellation, and unscrambled side-tone is presented to the speaker. The apparatus can be implemented in a digital signal processor.
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Hall Christopher A.
Holthaus James R.
Riensche Bradley A.
Gregory Bernarr E.
Transcrypt International, Inc.
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