Electricity: measuring and testing – Measuring – testing – or sensing electricity – per se – Frequency of cyclic current or voltage
Patent
1976-04-22
1977-08-02
Olms, Douglas W.
Electricity: measuring and testing
Measuring, testing, or sensing electricity, per se
Frequency of cyclic current or voltage
324 57DE, H04B 346
Patent
active
040397696
ABSTRACT:
There are disclosed instruments and methods for measuring envelope delay in a transmission channel which entail the simultaneous transmission over the channel of both a modulated reference tone and a modulated variable test tone. Unlike the prior art, in which the transmissions of the reference tone and the test tone take place alternately on the channel of interest, or in which the reference tone is transmitted over a separate channel, in accordance with the invention there is no need either to employ a second channel or to switch back and forth between tone transmissions. At the receiving end, the modulation signal on each tone is detected. The two modulation signals are the same at the transmitting end, and their phases are compared at the receiving end to determine the envelope delay of the channel.
REFERENCES:
patent: 2632792 (1953-03-01), Selz
patent: 2929987 (1960-03-01), Noland et al.
patent: 2970258 (1961-01-01), Sinclair
patent: 3119062 (1964-01-01), Codd
Bradley Telcom Corporation
Olms Douglas W.
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