Method and apparatus for encoding and decoding of audio transmis

Details Method and apparatus for encoding and decoding of audio transmis Method and apparatus for encoding and decoding of audio transmis

1994-11-14

1997-01-28

Gregory, Bernarr E.

Cryptography

Cryptanalysis

380 13, 380 19, 380 33, 380 34, 380 49, H04L 900, H04N 716

Patent

active

055984711

ABSTRACT:
A system for encoding and decoding an audio transmission signal comprises: (a) an encoder with a frequency-varying means to vary the carrier frequency of the audio signal according to an encryption algorithm; (b) a transmitter; (c) a receiver; and (d) a decoder with a multi-plexing filter for separating segments of the audio signal with identical carrier frequencies, and a demodulator corresponding to each carrier signal frequency. The separated segments of the audio signal are switched to the corresponding demodulators according to a decryption algorithm.

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patent: 4476566 (1984-10-01), Dent
patent: 4479226 (1984-10-01), Prabhu et al.
patent: 4578817 (1986-03-01), Rabain et al.
patent: 4586081 (1986-04-01), St. Arnaud et al.
patent: 4606040 (1986-08-01), David et al.

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