Title :
Armstrong´s Frequency Modulator
Author_Institution :
Marcellus Hartley Laboratory, Department of Electrical Engineering, Columbia University, New York, N.Y.
fDate :
4/1/1938 12:00:00 AM
Abstract :
When the side bands of an amplitude-modulated signal are shifted 90 degrees and then recombined with the carrier, a frequency-modulated carrier results. In this paper the order and magnitudes of the distortion components of such a frequency-modulated carrier are quantitatively determined assuming an idealized receiver. It is found that this type of distortion will be negligibly small after frequency multiplication to obtain the desired carrier frequency.
Keywords :
Amplitude modulation; Demodulation; Equations; Frequency conversion; Frequency modulation; Laboratories; Voltage;
Journal_Title :
Radio Engineers, Proceedings of the Institute of
DOI :
10.1109/JRPROC.1938.228196
