Noise signal processor
AssigneeThe United States of America as represented by the Secretary of the Navy
InventorsLawrence C. Pharo, Jr., John J. Portelli
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Abstract
Apparatus for providing a direct quantitative readout of the amplitudes of arious frequency lines that constitute the envelope of an amplitude-modulated broadband noise signal. A selected band of carrier frequencies is fed to an AGC circuit that provides a constant-input signal amplitude to a demodulator for a period of time that is greater than the period of the lowest frequency of the modulating signal for detection. The detected signal is fed to a spectrum analyzer for the direct reading of the percent modulation.
Claims10
In a signal processing apparatus for providing an output that is a direct quantitative readout of the amplitudes of various frequency lines that constitute the envelope of an amplitude modulated broadband noise signal, the combination comprising:
- a source of noise signals containing modulation information of interest,
- band pass filter means connected to said noise source for selecting a noise band known to contain modulation information of interest,
- circuit control means connected to said band pass filter means and providing an output signal that has a constant amplitude for a period of time that is greater than the period of the modulating signal,
- first indicator means connected to the input of said circuit control means for indicating when the excursions of the signal into said circuit control means is within the range of said circuit control means, and
- detector circuit means connected to said circuit control means for detecting the envelope of said modulating signal.
Dependencies are inferred from the claim text.