Processing of encrypted voice signals

Details Processing of encrypted voice signals Processing of encrypted voice signals

1982-04-05

1986-08-26

Cangialosi, Salvatore

Telegraphy

Systems

Printing

179 15R, H04L 902

Patent

active

046084550

ABSTRACT:
The occurrence of a transmission error which produces a multibit error burst in the decrypted version of a composite speech and synchronization encrypted signal using a one-bit cipher feedback or similar encryption scheme is detected by monitoring the decrypted signal to detect synchronization errors. Upon detection of an error, the decrypted speech output is muted or disabled to avoid the annoying audible click otherwise produced.

REFERENCES:
patent: 3613012 (1971-10-01), Feistel
patent: 3659046 (1972-04-01), Angeleri et al.
patent: 3894201 (1975-07-01), Pyles
patent: 3962646 (1976-06-01), Tempka
patent: 4020421 (1977-04-01), Elder et al.
patent: 4114105 (1978-09-01), Duncan
patent: 4312070 (1982-01-01), Coombes et al.
patent: 4430742 (1984-02-01), Milleker et al.
Federal Information Processing Standards, Publication 81.

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