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Astonishingly, although this membrane is made of only lipid without proteins, the membrane is excited.
Then, as the applied stimulus ( direct-current ) increases, the number of response-impulses also increases.
Namely, in this case, the direct-current as an analog quantity is transformed into the number of series of impulses in the membranous potential as a digital quantity.
Moreover, as this membrane is sensitive to the pressure from the outside, the frequency of the series of impulses remarkably depends on slight variations on the applied pressure.
Namely, this plays a role as a transducer to transform the pressure as an analog quantity into the frequency as a digital quantity.
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