Data processing: measuring – calibrating – or testing – Measurement system – Measured signal processing
Patent
1993-09-07
1999-04-06
Cosimano, Edward R.
Data processing: measuring, calibrating, or testing
Measurement system
Measured signal processing
G06F19100
Patent
active
058930540
ABSTRACT:
An estimate of amplitude of a sinusoidal signal is computed from a value of the signal by computing the value of a quadrature-phase signal and computing the amplitude based on the value of the signal and the value of the quadrature-phase signal. The quadrature-phase signal is computed, for example, by a Hilbert transform. The amplitude is approximated as the sum of the magnitude of one value and an even polynomial of the other value when the magnitude of the other value is relatively small. The amplitude is computed precisely by an iterative application of the approximation. In an automatic gain control, for example, the desired value is substituted for the actual amplitude in the iterative formula, to compute an error estimate that always has the same sign as the actual error. Therefore, the automatic gain control converges to set the amplitude of the sinusoidal signal to the desired value.
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Boeing North American Inc.
Cosimano Edward R.
Silberberg Charles T.
Streeter Tom
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