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