Electricity: measuring and testing – Measuring – testing – or sensing electricity – per se – Frequency of cyclic current or voltage
Patent
1976-12-15
1977-12-06
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
040618927
ABSTRACT:
There are disclosed instruments and methods for facilitating the measurement of characteristics of only a selected portion of a transmission channel. In my copending application Ser. No. 661,106, an apparatus located at the remote end of a channel of interest amplifies the received disturbance component relative to the received test tone, and forwards the resulting processed signal over a second channel to a test site. In this manner, the disturbance signal received by the test instrument represents the disturbance signal received at the remote end of the channel of interest, the disturbance introduced by the second channel being insignificant relative to the amplified disturbance component. In accordance with the present invention, an apparatus at the test site attenuates the received disturbance relative to the test tone by the same factor that it is amplified at the remote end of the first channel. In this manner, the composite test tone/disturbance signal applied to the test instrument is the same as that received at the remote end of the channel of interest.
REFERENCES:
patent: 3290451 (1966-12-01), Duimelaar
patent: 3422222 (1969-01-01), Lord
patent: 3814868 (1974-06-01), Bradley
"A New Measuring Set for Message Circuit Noise" by Cochran et al., Bell Sys. Tech. Jour., July 1960, pp. 911-925.
Bradley Telcom Corp.
Olms Douglas W.
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