Method of and system for scrambling/descrambling sound

Details Method of and system for scrambling/descrambling sound Method of and system for scrambling/descrambling sound

1988-12-20

1990-10-23

Cangialosi, Salvatore

Cryptography

Key management

Having particular key generator

380 20, H04K 100

Patent

active

049658263

ABSTRACT:
A method of and system for scrambling/descrambling audio transmission in which periods of silence in the sound to be transmitted are detected and utilized to trigger immediately changing the scrambling mode and for also transmitting a control signal to alert the receivers to the mode change. The scrambled sound signal is transmitted with a small decay with respect to the control signal which, in practice, may be provided by an intrinsic delay in the transmission circuits. In a TV transmission system, the control signal is advantageously transmitted in the video channel.

REFERENCES:
patent: 2200559 (1940-05-01), Mitchell et al.
patent: 4628358 (1986-12-01), Robbins
patent: 4636853 (1987-01-01), Forbes et al.
patent: 4654705 (1987-03-01), Forbes et al.
patent: 4679235 (1987-07-01), Okada et al.
patent: 4817144 (1989-03-01), Cirta et al.

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