Accession Number : ADD003285

Title :   Voice Controlled Disappearing Audio Delay Line.

Descriptive Note : Patent,


Personal Author(s) : Johnson,George B

Report Date : 20 Jul 1976

Pagination or Media Count : 13

Abstract : Some complex voice scramblers used by the U.S. Armed Forces transmit preambles before passing the voice signal. It is usually necessary that the communicator key the scrambler and then wait for the preamble to be transmitted before he speaks. Also where 'full duplex' operation is used that provides separate frequency for transmitting and receiving, it is desirable for more efficient operation to remove any delay caused by the transmission of a preamble or a postamble. The invention provides a voice-controlled disappearing audio delay line control circuit so that a 'hot mike' voice circuit can be fed into a voice scrambler. The operator then need not key the scrambler. There is no waiting for the preamble transmission before speaking. The voice scrambler can be remote from the operator with no intervening special control lines, since only the voice signal is required to control the scrambler.

Descriptors :   *Delay lines, *Patents, Speech scrambling, Voice communications, Secure communications, Shift registers, Control

Subject Categories : Electrical and Electronic Equipment
      Voice Communications

Distribution Statement : APPROVED FOR PUBLIC RELEASE