Method and apparatus for providing voice privacy in electronic communication systems
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United States of America Patent
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Sep 7, 1999
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N/A
app pub date -
Jun 28, 1996
filing date -
Jun 28, 1996
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Abstract
An apparatus and method for creating voice privacy in electronic voice transmission systems includes the steps of digitizing an analog signal and inverting and rotating the frequency spectrum of the digitized audio signal. From the inverted and rotated spectrum, a complex signal is created from which the real component is extracted to produce a real signal suitable for transmitting. The processing method may optionally include the steps of translating the frequency of the signal spectrum, reducing the sampling rate, shifting the spectrum of the signal again, increasing the sample rate, and extracting the real part of the signal to produce a real signal. The digital signal processing is performed entirely with software. The scrambling and descrambling processes are identical, therefore, the same hardware and software may be used to scramble and descramble the signal.
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