Figure 2 | Scientific Reports

Figure 2

From: Improving biodiversity assessment via unsupervised separation of biological sounds from long-duration recordings

Figure 2

An example of factorizing a spectrogram by using the PC-NMF. (a) Part of the simulation data; (b) spectral basis matrix; (c) encoding matrix. The encoding matrix was transformed (using discrete Fourier transform) to obtain (d) the periodicity matrix. The prominent peak and harmonic structures of the first eight bases in the periodicity matrix indicate that they represent the bases of a biological chorus.

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