| 摘要 |
A signal processing utility (7) is disclosed involving time-to-frequency domain transforms for applications including medical diagnostic signal processing. Such transforms can be used to define a continuous spectral density function or other spectral density function including non-zero value s at irregularly spaced frequency intervals. The invention thereby enables mor e accurate representation of certain real spectra and reduced spectral broadening. The utility also accounts for digitization errors associated wit h analog-to-digital conversion. The invention has particular advantages with respect to medical contexts where the received signal has a changing spectra l content as a result of interaction of an interrogating signal (2) with movin g physiological material such as blood flowing through an artery.
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