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Demonstration script of phase reconstruction with PHASRET and oct2py.
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| # -*- coding: utf-8 -*- | |
| """Demonstration script of phase reconstruction with PHASRET and oct2py. | |
| Copyright (C) 2024 by Akira TAMAMORI | |
| Permission is hereby granted, free of charge, to any person obtaining a copy | |
| of this software and associated documentation files (the "Software"), to deal | |
| in the Software without restriction, including without limitation the rights | |
| to use, copy, modify, merge, publish, distribute, sublicense, and/or sell | |
| copies of the Software, and to permit persons to whom the Software is | |
| furnished to do so, subject to the following conditions: | |
| The above copyright notice and this permission notice shall be included in all | |
| copies or substantial portions of the Software. | |
| THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR | |
| IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, | |
| FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE | |
| AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER | |
| LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, | |
| OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE | |
| SOFTWARE. | |
| """ | |
| import argparse | |
| from pathlib import Path | |
| import numpy as np | |
| import soundfile as sf | |
| from oct2py import octave | |
| from pesq import pesq | |
| from scipy import signal | |
| def main(): | |
| """Reconstruct phase by using SPSI.""" | |
| parser = argparse.ArgumentParser() | |
| parser.add_argument("--ltfat_dir", type=str, default="/work/tamamori/ltfat-main") | |
| parser.add_argument("--win_len", type=int, default=512) | |
| parser.add_argument("--hop_len", type=int, default=128) | |
| parser.add_argument("--fft_len", type=int, default=512) | |
| parser.add_argument("--window", type=str, default="hann") | |
| parser.add_argument("--pghi_type", choices=["normal", "causal"], default="causal") | |
| parser.add_argument("--in_wavdir", type=str, default="/home/tamamori") | |
| parser.add_argument("--in_wav", type=str, default="in.wav") | |
| args = parser.parse_args() | |
| # initialization | |
| octave.addpath(octave.genpath(args.ltfat_dir)) | |
| octave.ltfatstart(0) | |
| octave.phaseretstart(0) | |
| # compute magnitude spectrum | |
| audio, rate = sf.read(Path(args.in_wavdir, args.in_wav)) | |
| stfft = signal.ShortTimeFFT( | |
| win=signal.get_window(args.window, args.win_len), | |
| hop=args.hop_len, | |
| fs=rate, | |
| mfft=args.fft_len, | |
| ) | |
| mag_spec = np.abs(stfft.stft(audio)) | |
| # reconstruct phase spectrum with SPSI | |
| reconst_spec = octave.spsi(mag_spec, args.hop_len, args.win_len) | |
| audio_rec = stfft.istft(reconst_spec) | |
| score = pesq(rate, audio, audio_rec, "wb") | |
| print(f"SPSI={score}") | |
| # reconstruct phase spectrum with PGHI | |
| gamma = octave.pghi_findgamma(args.window, args.hop_len, args.win_len) | |
| reconst_spec = octave.pghi(mag_spec, gamma, args.hop_len, args.win_len) | |
| audio_rec = stfft.istft(reconst_spec) | |
| score = pesq(rate, audio, audio_rec, "wb") | |
| print(f"PGHI={score}") | |
| # reconstruct phase spectrum with RTPGHI | |
| reconst_spec = octave.rtpghi( | |
| mag_spec, gamma, args.hop_len, args.win_len, args.pghi_type | |
| ) | |
| audio_rec = stfft.istft(reconst_spec) | |
| score = pesq(rate, audio, audio_rec, "wb") | |
| print(f"RTPGHI={score}") | |
| # reconstruct phase spectrum with RTISILA | |
| _, n_frame = mag_spec.shape | |
| dgtlen = octave.dgtlength(n_frame * args.hop_len, args.hop_len, args.win_len) | |
| if dgtlen > n_frame * args.hop_len: | |
| ratio = (dgtlen - n_frame * args.hop_len) // args.hop_len | |
| mag_spec = np.pad(mag_spec, ((0, 0), (int(ratio), 0))) | |
| gabwin = octave.gabwin(args.window, args.hop_len, args.win_len, args.win_len) | |
| # online: no lookahead (0 frame) | |
| reconst_spec = octave.rtisila( | |
| mag_spec, gabwin, args.hop_len, args.win_len, "lookahead", 0 | |
| ) | |
| audio_rec = stfft.istft(reconst_spec) | |
| score = pesq(rate, audio, audio_rec, "wb") | |
| print(f"RTISILA (online)={score}") | |
| # offline: a few lookahead frames (3 frames) | |
| reconst_spec = octave.rtisila( | |
| mag_spec, gabwin, args.hop_len, args.win_len, "lookahead", 3 | |
| ) | |
| audio_rec = stfft.istft(reconst_spec) | |
| score = pesq(rate, audio, audio_rec, "wb") | |
| print(f"RTISILA (offline)={score}") | |
| if __name__ == "__main__": | |
| main() |
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