Frequency Modulation Noise Characteristics
@article{Crosby1937FrequencyMN, title={Frequency Modulation Noise Characteristics}, author={M.G. Crosby}, journal={Proceedings of the Institute of Radio Engineers}, year={1937}, volume={25}, pages={472-514} }
Theory and experimental data are given which show the improvements in signal-noise ratio effected by frequency modulation over amplitude modulation. It is shown that above a certain carrier-noise ratio in the frequency modulation receiver which is called the "improvement threshold," the frequency modulation signal-noise ratio is greater than the amplitude modulation signal-noise ratio by a factor equal to the product of a constant and the deviation ratio (the deviation ratio is equal to the…
67 Citations
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References
SHOWING 1-3 OF 3 REFERENCES
Fluctuation Noise in Radio Receivers
- PhysicsProceedings of the Institute of Radio Engineers
- 1930
This paper discusses fluctuation noise in radio receivers due to shot and thermal effects (Schottky) in the radio-frequency circuits. The r-f noise components beat with the carrier when a signal is…
Frequency Modulation Propagation Characteristics
- PhysicsProceedings of the Institute of Radio Engineers
- 1936
Early work on frequency modulation is described wherein the propagation characteristics of frequency modulation were determined for frequencies between 9000 and 18,000 kilocycles. Oscilloscopic wave…
The Reduction of Atmospheric Disturbances
- PhysicsProceedings of the Institute of Radio Engineers
- 1928
In the decade or so during which the problem of eliminating or at least reducing atmospheric disturbances has been given serious and systematic study we have learned, more or less definitely, what we…