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Analog scrambler

Cryptography – Communication system using cryptography – Frequency shift or inversion
Reexamination Certificate

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Decoder to decode an encrypted sound

Cryptography – Communication system using cryptography – Frequency shift or inversion
Patent

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Digital voice-band spectrum inversion apparatus

Cryptography – Communication system using cryptography – Frequency shift or inversion
Patent

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Duplex analog scrambler

Cryptography – Communication system using cryptography – Frequency shift or inversion
Patent

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Frequency inversion scrambler with integrated high-pass filter h

Cryptography – Communication system using cryptography – Frequency shift or inversion
Patent

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Method and apparatus for decoding of frequency inversion based s

Cryptography – Communication system using cryptography – Frequency shift or inversion
Patent

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Method and apparatus for distorting a speech signal

Cryptography – Communication system using cryptography – Frequency shift or inversion
Patent

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Method and apparatus for performing frequency spectrum inversion

Cryptography – Communication system using cryptography – Frequency shift or inversion
Patent

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Method for providing security for a transmission of...

Cryptography – Communication system using cryptography – Frequency shift or inversion
Reexamination Certificate

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Microprocessor apparatus and method for performing block...

Cryptography – Communication system using cryptography – Frequency shift or inversion
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Modulation/demodulation circuit and communication system utilizi

Cryptography – Communication system using cryptography – Frequency shift or inversion
Patent

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Radio communication apparatus having common oscillator applied f

Cryptography – Communication system using cryptography – Frequency shift or inversion
Patent

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Scrambling and descrambling circuit for a cordless telephone

Cryptography – Communication system using cryptography – Frequency shift or inversion
Patent

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Secret speech equipment

Cryptography – Communication system using cryptography – Frequency shift or inversion
Patent

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Speech privacy processing method and apparatus therefor

Cryptography – Communication system using cryptography – Frequency shift or inversion
Patent

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Voice band splitting scrambler

Cryptography – Communication system using cryptography – Frequency shift or inversion
Patent

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Wireless telephone with frequency inversion scrambling

Cryptography – Communication system using cryptography – Frequency shift or inversion
Patent

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Wireless telephone with frequency inversion scrambling

Cryptography – Communication system using cryptography – Frequency shift or inversion
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