Speech scrambler

Details Speech scrambler Speech scrambler

1986-06-30

1988-05-24

Cangialosi, Salvatore

Cryptography

Cryptanalysis

380 9, 380 28, H04L 900

Patent

active

047471379

ABSTRACT:
A speech scrambler is disclosed, in which a frequency spectrum obtained by an orthogonal transform of a time domain signal is divided into a plurality of blocks in the frequency domain. One of the blocks which has energy less than a predetermined value is adaptively replaced by a dummy spectrum. The resulting spectrum is rearranged in accordance with a predetermined rule. The frequency spectrum is subjected to an inverse othogonal transform to obtain a time domain signal for transmission. The orthogonal transform is fast Fourier transform or fast Hadamard transform.

REFERENCES:
patent: 2129860 (1938-09-01), Mitchell
patent: 4210931 (1980-07-01), Bailey et al.
patent: 4232194 (1980-11-01), Adams
patent: 4390898 (1983-06-01), Bond et al.
patent: 4446530 (1984-05-01), Tsuboka

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