Telephonic communications – Diagnostic testing – malfunction indication – or electrical... – Of trunk or long line
Patent
1993-03-03
1995-04-04
Chin, Stephen
Telephonic communications
Diagnostic testing, malfunction indication, or electrical...
Of trunk or long line
379 1, 379 27, 379 29, 379 30, H04M 124, H04M 322
Patent
active
054043883
ABSTRACT:
In digital measurement of the amplitude and phase of a sinusoidal signal of known frequency by the least square error method, the sampling frequency and sample size are carefully selected to satisfy a certain relationship. Under these conditions, the measurements are simplified and accuracy improved. This technique of measuring a sinusoidal signal is applied to the detection of a load coil in a telephone subscriber's loop circuit. The magnitude and phase of the driving point impedance of the loop are measured through the use of a series of discrete sinusoidal stimulus signals of predetermined frequencies and a digital signal processing technique.
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Chin Stephen
Northern Telecom Limited
Shankar Vijay
LandOfFree
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