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Comparison of time complexity
| Stage | Process | Hu–Wang [11] | Zhang–Liu [14] |
|---|---|---|---|
| Front-end | Signal decomposition | O(CL) | O(CL) |
| Envelope Extraction | O(CLlog(L)) | O(CLlog(L)) | |
| Correlograms | O(CLD) | ||
| ZCR | O(CL) | ||
| Pitch estimation | Segmentation | O(CL/T) | O(CL/T) |
| Pitch estimation | O(CL) | O(CL) | |
| Unit labeling | Bandpass filtering | O(CLF) | |
| Comb filtering | O(CL) | ||
| Separation and synthesis | O(CL) | O(CL) |
C number of channels, L length of input signal, T time shift, D maximum pitch period, F length of FIR bandpass filter
