Electricity: measuring and testing – Measuring – testing – or sensing electricity – per se – Frequency of cyclic current or voltage
Patent
1976-07-26
1978-02-14
Griffin, Robert L.
Electricity: measuring and testing
Measuring, testing, or sensing electricity, per se
Frequency of cyclic current or voltage
324 57N, H04B 1700
Patent
active
040742016
ABSTRACT:
Signal monitoring apparatus in which a baseband signal including noise is compared at timed intervals with a reference signal and an estimated noise signal from an estimated noise signal generator. Indications of whether the estimated noise signal is higher or lower than the noise level present in the signal are applied to a digital accumulator in the estimated noise signal generator. Certain of the most significant bits in the accumulator are employed to generate the analog estimated noise signal. An arrangement for preventing or permitting the passage of indications to the accumulator approximates the Rayleigh distribution of differential error probabilities about the estimated noise signal being generated. The result is that the estimated noise signal is an rms value averaged over a large number of measurements. Certain of the most significant bits in the accumulator are decoded and converted to an analog voltage which is a measure of the signal-to-noise power ratio of the baseband signal.
REFERENCES:
patent: 3189891 (1965-06-01), Karsh
"Adaptive Delta Modulator with Variable"-Sample Rate-Jones, et al., Mar. 1973, vol. 15, No. 10-IBM Technical Disclosure Bulletin, pp. 3168-3169.
Bookbinder Marc E.
Griffin Robert L.
GTE Sylvania Incorporated
Keay David M.
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