Accession Number : ADD000587

Title :   Receiver for Desk Signals.

Descriptive Note : Patent,

Corporate Author : DEPARTMENT OF THE NAVY WASHINGTON D C

Personal Author(s) : Malone,James T ; Brennan,Richard L ; Hallock,Donald D

Report Date : 14 Jan 1975

Pagination or Media Count : 8

Abstract : The patent describes apparatus for receiving double frequency shift keying signals (DFSK) which employs a phase locked loop as the frequency discriminator for tracking the four frequency states. A floating detector establishes reference voltage levels for a trio of comparators which form a binary code indicative of the number of these levels exceeded by the input signal. This code is converted by logic into mark and space signals which are held in a register until transferred to the output devices by a strobe signal.

Descriptors :   *Radio receivers, *Patents, Frequency shift keyers, Phase locked systems, Multichannel communications, Demodulators

Subject Categories : Radio Communications

Distribution Statement : APPROVED FOR PUBLIC RELEASE