| 摘要 |
A quadrature analog-to-digital sampler, operating at a minimum sampling rate equal to the bandwidth of the input signal provides a pair of quadrature related digital signals which are input to first and second digital computers. The first computer calculates the instantaneous amplitude of the input signal and the second computer computes the instantaneous phase of the input signal. A third digital computer acts on the output of the second computer and differentiates the instantaneous phase of the signal with respect to time to provide frequency modulation output.
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