| 摘要 |
An input signal is multiplied by a reference and quadrature signal and the two output signals are integrated and multiplied by a ramp signal, having a period equal to the maximum period of the input signal, and integrated to provide four output signals. The integrated product of the input, reference and ramp signals is multiplied by the integrated product of the input and quadrature signals and the product is subtracted from the product signal of the integrated product of the input and reference signals multiplied by the integrated product of the input, quadrature and ramp signals. The difference output signal is the gradient of the envelope of the maximum posterior-probability estimate of the frequency of the input signal.
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