Telephone line characteristic display

Details Telephone line characteristic display Telephone line characteristic display

1976-08-24

1977-08-09

Olms, Douglas W.

Electricity: measuring and testing

Measuring, testing, or sensing electricity, per se

Frequency of cyclic current or voltage

324121R, H04B 346

Patent

active

040412547

ABSTRACT:
There is disclosed a telephone line characteristic measuring instrument of the type described in U.S. Pat. No. 3,814,868, provided with an oscilloscope display. A signal representing the impairments induced on a test tone by a tele-communication transmission facility, without the test tone itself, is applied to the vertical deflection plates of an oscilloscope. The test tone, or one of its harmonics, is applied to the horizontal deflection plates. The resulting Lissajous patterns identify the source of a disturbance (e.g., amplitude modulation, phase modulation, white noise, etc.).

REFERENCES:
patent: 3814868 (1974-06-01), Bradley
patent: 3906173 (1975-09-01), Bradley
patent: 3927281 (1975-12-01), Bradley
patent: 3985980 (1976-10-01), Bradley

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