Electricity: measuring and testing – Measuring – testing – or sensing electricity – per se – Frequency of cyclic current or voltage
Patent
1976-02-25
1977-05-03
Olms, Douglas W.
Electricity: measuring and testing
Measuring, testing, or sensing electricity, per se
Frequency of cyclic current or voltage
324 57N, H04B 346
Patent
active
040216250
ABSTRACT:
There are disclosed instruments and methods for measuring the characteristics of only a selected portion of an overall transmission channel. A test tone is transmitted from a test site to a remote facility over a path to be tested, and the received signal is transmitted back to the test site over a return path. Under ordinary circumstances, it is not possible to distinguish at the test site between the distortions which arose during the forward and return transmissions. In accordance with the invention, apparatus is inserted at the remote facility which amplifies the received noise relative to the test tone. Although additional noise is introduced in the return path, it is usually insignificant relative to the amplified forward-path noise. The apparatus at the remote facility preserves the test tone and re-transmits it back to the test site because the test tone is required at the test site; several important measurements are dependent upon the phase and amplitude of the impairments relative to the tone in the signal received at the remote facility.
REFERENCES:
patent: 1869515 (1932-08-01), Shanck
patent: 3814868 (1974-06-01), Bradley
patent: 3836735 (1974-09-01), Bradley
patent: 3920935 (1975-11-01), Vierling et al.
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