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<p>frequency. Obtaining a spectrum from time series data such as these involves the <a href="page.php?w=Fourier_transform">Fourier transform</a>, and generalizations based on Fourier analysis. In many cases the time domain is not directly captured in practice, such as when a <a href="page.php?w=dispersive_prism">dispersive prism</a> is used to obtain a spectrum of light in a <a href="page.php?w=spectrograph">spectrograph</a>, or when a sound is perceived through its effect on the auditory receptors of the inner ear, each of which is sensitive to</p><p>
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