Cicada song, wavelet graph

Cicada song, wavelet graph

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Caption: Cicada song, wavelet graph. This image was produced by converting the sound frequencies of a singing male cicada (Okanagana canadensis) 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. Male cicadas produce a very loud 'song' by vibrating a membrane organ on their bodies called a tympana. Each species produces its own unique song. Image created by Mark Fischer from Aguasonic Acoustics, USA.

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