FREQUENCY EXTENSION OF HARMONIC SIGNAL

摘要

PROBLEM TO BE SOLVED: To provide a system capable of appropriately extending the harmonics of band limited harmonic signals.

SOLUTION: Harmonic content of a band-limited signal is extended to frequencies outside the passband of the signal by performing a non-linear transformation on the complex spectrum of the band-limited signal in the frequency domain. The non-linear transformation may be accomplished by a linear convolution of the complex spectrum with itself. A system for extending the frequency bandwidth of a harmonic signal includes a signal processor with a forward transform module (208)for transforming a time domain signal into frequency domain, a non-linear transform module (210) for performing the non-linear transformation on the complex spectrum of the harmonic signal, and a inverse transform module (212)for transforming the extended spectrum of the harmonic signal back into the time domain.

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