Electricity: measuring and testing – Measuring – testing – or sensing electricity – per se – Frequency of cyclic current or voltage
Patent
1974-07-16
1976-07-20
Stewart, David L.
Electricity: measuring and testing
Measuring, testing, or sensing electricity, per se
Frequency of cyclic current or voltage
324 57N, H04J 116
Patent
active
039707954
ABSTRACT:
TNR (Traffic Noise Ratio) is defined as the ratio of the portion of the noise representing a multi-channel signal that occurs in a narrow bandwidth (including inherent, and intermodulation) to the noise in the same bandwidth, in the absence of a traffic signal in that bandwidth, under specified traffic conditions. The TNR of a communications link is measured by measuring the noise power level in a predetermined bandwidth in a quiet channel with reference to a signal representative of the power that would be in the quiet channel if it was loaded under peak traffic conditions. The noise power level is measured using a digitally stepped automatic attenuator controlled by a feedback loop which includes filters for isolating the noise in the quiet channel.
REFERENCES:
patent: 2987586 (1961-06-01), Berger
patent: 3357007 (1967-12-01), Wike
patent: 3586993 (1971-06-01), Buck
patent: 3683282 (1972-08-01), D'Amato
patent: 3691306 (1972-09-01), Molo
patent: 3787628 (1974-01-01), Van Dijk
Stewart David L.
The Post Office
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