Accession Number : ADD000236
Title : Low-Phase-Shift Incremental FM Demodulator.
Descriptive Note : Patent,
Corporate Author : DEPARTMENT OF THE NAVY WASHINGTON D C
Personal Author(s) : Milne,David T ; Cook,George W
Report Date : 02 Apr 1974
Pagination or Media Count : 9
Abstract : The patent describes a device which demodulates an FM signal by generating switching pulses for each zero crossing of the FM signal. The switching signals are then used to control a charging circuit whose output amplitude is linearly proportional to the modulated frequency and thereby to the original intelligence in amplitude form, used to frequency modulate the carrier. The output is a series of discrete amplitudes forming the envelope of the original information. The device produces a linear correspondence between frequency and amplitude without an intermediate step of removing the carrier in the conventional way by a six pole filter.
Descriptors : *Demodulators, *Patents, Phase shift circuits, Increments, Frequency modulation
Subject Categories : Non-radio Communications
Distribution Statement : APPROVED FOR PUBLIC RELEASE