Electricity: measuring and testing – Measuring – testing – or sensing electricity – per se – Frequency of cyclic current or voltage
Patent
1983-07-08
1985-10-15
Strecker, Gerard R.
Electricity: measuring and testing
Measuring, testing, or sensing electricity, per se
Frequency of cyclic current or voltage
324 77R, 343 55A, G01R 2314, G01R 2316
Patent
active
045477272
ABSTRACT:
The instantaneous frequency measurement (IFM) receiver is highly susceptible to erroneously reporting frequency if two or more signals are overlapped in time. This problem is extremely important when the receiver is presented with synchronized signals. A method is presented to detect simultaneous signals which overlap in the critical frequency encode strobe.
In essence, during the pulse overlap condition, a transient will occur on the video output lines of the receiver. These lines are monitored during the transient period and compared with predetermined values which are obtained from the single signal condition. If a transient is detected, a simultaneous signal detect flag is raised and this flag is sent to an associated processor. In this special design, the receiver will measure the frequency again at approximately 200 ns from the first measurement. The transient detection is also performed on the second measurement.
REFERENCES:
patent: 3939411 (1976-02-01), James
patent: 4188628 (1980-02-01), Langeraar
patent: 4336541 (1982-06-01), Tsui
patent: 4426648 (1984-01-01), Tsui
Shaw Rudy L.
Tsui James B. Y.
Franz Bernard E.
Raevis R.
Singer Donald J.
Strecker Gerard R.
The United States of America as represented by the Secretary of
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