Digital measurement of amplitude and phase of a sinusoidal signal and detection of load coil based on said measurement
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United States of America Patent
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Apr 4, 1995
Grant Date -
N/A
app pub date -
Mar 3, 1993
filing date -
Mar 3, 1993
priority date (Note) -
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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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