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metal prints nature metal prints sparrow metal prints wildlife metal prints bird metal prints chipping sparrow metal prints spizella passerina metal prints graph metal prints bird song metal prints biology metal prints mathematics metal prints physics metal prints zoology metal prints acoustic engineering metal prints circle metal prints acoustic metal prints

photographs nature photos sparrow photos wildlife photos bird photos chipping sparrow photos spizella passerina photos graph photos bird song photos biology photos mathematics photos physics photos zoology photos acoustic engineering photos circle photos acoustic photos

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Chipping sparrow (Spizella passerina) song, wavelet graph. This image was produced by converting the frequencies of sounds made by a chipping sparrow, a bird native to North America, into a graph using a mathematical process known as wavelets. Wavelets reveal structure and detail that are not always visible in standard graphs of frequency over time (known as a spectrogram). This image has been plotted as a polar coordinate (circular) graph but wavelet graphs can also be in rectangular form. Image created by Mark Fischer from Aguasonic Acoustics, USA.

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