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Birdsong Denoising Using Wavelets

Fig 4

Wavelets and their relation to time-frequency resolution and wavelet packet decomposition.

Time-frequency resolution in (a) STFT and (b) wavelets. Examples of mother wavelets: (c) Haar; (d) a subset of Daubechies wavelets; (e) Discrete Meyer wavelet. (f) Scaling and shifting the mother wavelet Ψ1,0(t) gives two new wavelets Ψ2,0(t) and Ψ2,1(t). (g) A level three wavelet packet decomposition tree (A- approximation and D- detail).

Fig 4

doi: https://doi.org/10.1371/journal.pone.0146790.g004