| 摘要 |
A system and method for producing and controlling a random signal with simultaneous control of both the power spectral density (PSD) and kurtosis ( 100 ) where a controlled signal is measured from a transducer, and converted to a PSD ( 111 ) using a Fast Fourier Transform (FFT). The measured PSD is compared ( 117 ) with a reference PSD ( 121 ) where an adaptive filter ( 119 ) is updated to compensate for the error. Simultaneously the kurtosis of the measured data is computed ( 125 ) and compared to a reference kurtosis ( 123 ). A feedback control loop ( 127 ) is employed to adjust the kurtosis of a white noise random generator with variable kurtosis ( 101 ). This white noise is then filtered by the adaptive filter ( 119 ) to provide the output signal used to drive the control process.
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