Figure 3: Sensing resolution and sound detection. | Nature Communications

Figure 3: Sensing resolution and sound detection.

From: High-sensitivity acoustic sensors from nanofibre webs

Figure 3

Voltage outputs of the nanofibre sensor device under bi-frequency sound waves and the FFT-processed frequency spectrum (a) 190 and 260 Hz, (b) 220.00 and 220.05 Hz (SPL 115 dB for both loudspeakers); (c) voltage outputs of people’s voice ‘one, two, three, four, five’ and the FFT-processed frequency spectrum (SPL, 70–80 dB). The black, orange, blue, pink and green lines represent voltage outputs (left) and FFT profiles (right) of words ‘one, two, three, four, five’, respectively. (d) Sound waveform of the same voice recorded by a commercial microphone and the FFT-processed spectrogram (the colour from blue, pink to red and white in the spectrogram indicates sound intensity increases).

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