# diffsptk
*diffsptk* is a differentiable version of [SPTK](https://github.com/sp-nitech/SPTK) based on the PyTorch framework.
[](https://sp-nitech.github.io/diffsptk/3.3.1/)
[](https://pepy.tech/project/diffsptk)
[](https://clickpy.clickhouse.com/dashboard/diffsptk)
[](https://pypi.python.org/pypi/diffsptk)
[](https://pypi.python.org/pypi/diffsptk)
[](https://pypi.python.org/pypi/diffsptk)
[](https://app.codecov.io/gh/sp-nitech/diffsptk)
[](https://github.com/sp-nitech/diffsptk/blob/master/LICENSE)
[](https://github.com/sp-nitech/diffsptk/actions)
[](https://github.com/astral-sh/ruff)
## Requirements
- Python 3.10+
- PyTorch 2.3.1+
## Documentation
- See [this page](https://sp-nitech.github.io/diffsptk/3.3.1/) for the reference manual.
- Our [paper](https://www.isca-speech.org/archive/ssw_2023/yoshimura23_ssw.html) is available on the ISCA Archive.
## Installation
The latest stable release can be installed through PyPI by running
```sh
pip install diffsptk
```
The development release can be installed from the master branch:
```sh
pip install git+https://github.com/sp-nitech/diffsptk.git@master
```
## Examples
### Running on a GPU
```python
import diffsptk
stft_params = {"frame_length": 400, "frame_period": 80, "fft_length": 512}
# Read waveform.
x, sr = diffsptk.read("assets/data.wav", device="cuda")
# Compute spectrogram using a nn.Module class.
X1 = diffsptk.STFT(**stft_params, device="cuda")(x)
# Compute spectrogram using a functional method.
X2 = diffsptk.functional.stft(x, **stft_params)
print(X1.allclose(X2))
```
### Mel-cepstral analysis and synthesis
```python
import diffsptk
fl = 400 # Frame length.
fp = 80 # Frame period.
n_fft = 512 # FFT length.
M = 24 # Mel-cepstrum dimensions.
# Read waveform.
x, sr = diffsptk.read("assets/data.wav")
# Compute STFT amplitude of x.
stft = diffsptk.STFT(frame_length=fl, frame_period=fp, fft_length=n_fft)
X = stft(x)
# Estimate mel-cepstrum of x.
alpha = diffsptk.get_alpha(sr)
mcep = diffsptk.MelCepstralAnalysis(
fft_length=n_fft,
cep_order=M,
alpha=alpha,
n_iter=10,
)
mc = mcep(X)
# Reconstruct x.
mlsa = diffsptk.MLSA(filter_order=M, frame_period=fp, alpha=alpha, taylor_order=20)
x_hat = mlsa(mlsa(x, -mc), mc)
# Write reconstructed waveform.
diffsptk.write("reconst.wav", x_hat, sr)
# Compute error.
error = (x_hat - x).abs().sum()
print(error)
# Extract pitch of x.
pitch = diffsptk.Pitch(
frame_period=fp,
sample_rate=sr,
f_min=80,
f_max=180,
voicing_threshold=0.4,
out_format="pitch",
)
p = pitch(x)
# Generate excitation signal.
excite = diffsptk.ExcitationGeneration(frame_period=fp)
e = excite(p)
n = diffsptk.nrand(x.size(0) - 1)
# Synthesize waveform.
x_voiced = mlsa(e, mc)
x_unvoiced = mlsa(n, mc)
# Output analysis-synthesis result.
diffsptk.write("voiced.wav", x_voiced, sr)
diffsptk.write("unvoiced.wav", x_unvoiced, sr)
```
### WORLD analysis and synthesis
```python
import diffsptk
fp = 80 # Frame period.
n_fft = 1024 # FFT length.
# Read waveform.
x, sr = diffsptk.read("assets/data.wav")
# Extract F0 of x, or prepare well-estimated F0.
pitch = diffsptk.Pitch(
frame_period=fp,
sample_rate=sr,
f_min=80,
f_max=180,
voicing_threshold=0.4,
out_format="f0",
)
f0 = pitch(x)
# Extract aperiodicity of x by D4C.
ap = diffsptk.Aperiodicity(
frame_period=fp,
sample_rate=sr,
fft_length=n_fft,
algorithm="d4c",
out_format="a",
)
A = ap(x, f0)
# Extract spectral envelope of x by CheapTrick.
pitch_spec = diffsptk.PitchAdaptiveSpectralAnalysis(
frame_period=fp,
sample_rate=sr,
fft_length=n_fft,
algorithm="cheap-trick",
out_format="power",
)
S = pitch_spec(x, f0)
# Reconstruct x.
world_synth = diffsptk.WorldSynthesis(
frame_period=fp,
sample_rate=sr,
fft_length=n_fft,
)
x_hat = world_synth(f0, A, S)
# Write reconstructed waveform.
diffsptk.write("reconst.wav", x_hat, sr)
# Compute error.
error = (x_hat - x).abs().sum()
print(error)
```
### LPC analysis and synthesis
```python
import diffsptk
fl = 400 # Frame length.
fp = 80 # Frame period.
M = 24 # LPC dimensions.
# Read waveform.
x, sr = diffsptk.read("assets/data.wav")
# Estimate LPC of x.
frame = diffsptk.Frame(frame_length=fl, frame_period=fp)
window = diffsptk.Window(in_length=fl)
lpc = diffsptk.LPC(frame_length=fl, lpc_order=M, eps=1e-5)
a = lpc(window(frame(x)))
# Convert to inverse filter coefficients.
norm0 = diffsptk.AllPoleToAllZeroDigitalFilterCoefficients(filter_order=M)
b = norm0(a)
# Reconstruct x.
zerodf = diffsptk.AllZeroDigitalFilter(filter_order=M, frame_period=fp)
poledf = diffsptk.AllPoleDigitalFilter(filter_order=M, frame_period=fp)
x_hat = poledf(zerodf(x, b), a)
# Write reconstructed waveform.
diffsptk.write("reconst.wav", x_hat, sr)
# Compute error.
error = (x_hat - x).abs().sum()
print(error)
```
### Mel-spectrogram analysis and synthesis
```python
import diffsptk
fl = 400 # Frame length.
fp = 80 # Frame period.
n_fft = 512 # FFT length.
n_channel = 128 # Number of channels.
# Read waveform.
x, sr = diffsptk.read("assets/data.wav")
# Compute STFT amplitude of x.
stft = diffsptk.STFT(frame_length=fl, frame_period=fp, fft_length=n_fft)
X = stft(x)
# Extract log mel-spectrogram.
fbank = diffsptk.FBANK(
fft_length=n_fft,
n_channel=n_channel,
sample_rate=sr,
)
Y = fbank(X)
# Reconstruct linear spectrogram.
ifbank = diffsptk.IFBANK(
n_channel=n_channel,
fft_length=n_fft,
sample_rate=sr,
)
X_hat = ifbank(Y)
# Reconstruct x.
griffin = diffsptk.GriffinLim(
frame_length=fl,
frame_period=fp,
fft_length=n_fft,
)
x_hat = griffin(X_hat, out_length=x.size(0))
# Write reconstructed waveform.
diffsptk.write("reconst.wav", x_hat, sr)
# Compute error.
error = (x_hat - x).abs().sum()
print(error)
```
### Subband decomposition
```python
import diffsptk
K = 4 # Number of subbands.
M = 40 # Order of filter.
# Read waveform.
x, sr = diffsptk.read("assets/data.wav")
# Decompose x.
pqmf = diffsptk.PQMF(K, M)
decimate = diffsptk.Decimation(K)
y = decimate(pqmf(x))
# Reconstruct x.
interpolate = diffsptk.Interpolation(K)
ipqmf = diffsptk.IPQMF(K, M)
x_hat = ipqmf(interpolate(K * y)).reshape(-1)
# Write reconstructed waveform.
diffsptk.write("reconst.wav", x_hat, sr)
# Compute error.
error = (x_hat - x).abs().sum()
print(error)
```
### Gammatone filter bank analysis and synthesis
```python
import diffsptk
# Read waveform.
x, sr = diffsptk.read("assets/data.wav")
# Decompose x.
gammatone = diffsptk.GammatoneFilterBankAnalysis(sr)
y = gammatone(x)
# Reconstruct x.
igammatone = diffsptk.GammatoneFilterBankSynthesis(sr)
x_hat = igammatone(y).reshape(-1)
# Write reconstructed waveform.
diffsptk.write("reconst.wav", x_hat, sr)
# Compute error.
error = (x_hat - x).abs().sum()
print(error)
```
### Fractional octave band analysis and synthesis
```python
import diffsptk
# Read waveform.
x, sr = diffsptk.read("assets/data.wav")
# Decompose x.
oband = diffsptk.FractionalOctaveBandAnalysis(sr)
y = oband(x)
# Reconstruct x.
x_hat = y.sum(1).reshape(-1)
# Write reconstructed waveform.
diffsptk.write("reconst.wav", x_hat, sr)
# Compute error.
error = (x_hat - x).abs().sum()
print(error)
```
### Constant-Q transform
```python
import diffsptk
import librosa # This is to get sample audio.
fp = 128 # Frame period.
K = 252 # Number of CQ-bins.
B = 36 # Number of bins per octave.
# Read waveform.
x, sr = diffsptk.read(librosa.ex("trumpet"))
# Transform x.
cqt = diffsptk.CQT(fp, sr, n_bin=K, n_bin_per_octave=B)
c = cqt(x)
# Reconstruct x.
icqt = diffsptk.ICQT(fp, sr, n_bin=K, n_bin_per_octave=B)
x_hat = icqt(c, out_length=x.size(0))
# Write reconstructed waveform.
diffsptk.write("reconst.wav", x_hat, sr)
# Compute error.
error = (x_hat - x).abs().sum()
print(error)
```
### Modified discrete cosine transform
```python
import diffsptk
fl = 512 # Frame length.
# Read waveform.
x, sr = diffsptk.read("assets/data.wav")
# Transform x.
mdct = diffsptk.MDCT(fl)
c = mdct(x)
# Reconstruct x.
imdct = diffsptk.IMDCT(fl)
x_hat = imdct(c, out_length=x.size(0))
# Write reconstructed waveform.
diffsptk.write("reconst.wav", x_hat, sr)
# Compute error.
error = (x_hat - x).abs().sum()
print(error)
```
### Vector quantization
```python
import diffsptk
K = 2 # Codebook size.
M = 4 # Order of vector.
# Prepare input.
x = diffsptk.nrand(M)
# Quantize x.
vq = diffsptk.VectorQuantization(M, K)
x_hat, indices, commitment_loss = vq(x)
# Compute error.
error = (x_hat - x).abs().sum()
print(error)
```
## License
This software is released under the Apache License 2.0.
## Citation
```bibtex
@InProceedings{sp-nitech2023sptk,
author = {Takenori Yoshimura and Takato Fujimoto and Keiichiro Oura and Keiichi Tokuda},
title = {{SPTK4}: An open-source software toolkit for speech signal processing},
booktitle = {12th ISCA Speech Synthesis Workshop (SSW 2023)},
pages = {211--217},
year = {2023},
}
```
Raw data
{
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"maintainer_email": "Takenori Yoshimura <takenori@sp.nitech.ac.jp>",
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"author": "SPTK Working Group",
"author_email": null,
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"description": "# diffsptk\n\n*diffsptk* is a differentiable version of [SPTK](https://github.com/sp-nitech/SPTK) based on the PyTorch framework.\n\n[](https://sp-nitech.github.io/diffsptk/3.3.1/)\n[](https://pepy.tech/project/diffsptk)\n[](https://clickpy.clickhouse.com/dashboard/diffsptk)\n[](https://pypi.python.org/pypi/diffsptk)\n[](https://pypi.python.org/pypi/diffsptk)\n[](https://pypi.python.org/pypi/diffsptk)\n[](https://app.codecov.io/gh/sp-nitech/diffsptk)\n[](https://github.com/sp-nitech/diffsptk/blob/master/LICENSE)\n[](https://github.com/sp-nitech/diffsptk/actions)\n[](https://github.com/astral-sh/ruff)\n\n## Requirements\n\n- Python 3.10+\n- PyTorch 2.3.1+\n\n## Documentation\n\n- See [this page](https://sp-nitech.github.io/diffsptk/3.3.1/) for the reference manual.\n- Our [paper](https://www.isca-speech.org/archive/ssw_2023/yoshimura23_ssw.html) is available on the ISCA Archive.\n\n## Installation\n\nThe latest stable release can be installed through PyPI by running\n\n```sh\npip install diffsptk\n```\n\nThe development release can be installed from the master branch:\n\n```sh\npip install git+https://github.com/sp-nitech/diffsptk.git@master\n```\n\n## Examples\n\n### Running on a GPU\n\n```python\nimport diffsptk\n\nstft_params = {\"frame_length\": 400, \"frame_period\": 80, \"fft_length\": 512}\n\n# Read waveform.\nx, sr = diffsptk.read(\"assets/data.wav\", device=\"cuda\")\n\n# Compute spectrogram using a nn.Module class.\nX1 = diffsptk.STFT(**stft_params, device=\"cuda\")(x)\n\n# Compute spectrogram using a functional method.\nX2 = diffsptk.functional.stft(x, **stft_params)\n\nprint(X1.allclose(X2))\n```\n\n### Mel-cepstral analysis and synthesis\n\n```python\nimport diffsptk\n\nfl = 400 # Frame length.\nfp = 80 # Frame period.\nn_fft = 512 # FFT length.\nM = 24 # Mel-cepstrum dimensions.\n\n# Read waveform.\nx, sr = diffsptk.read(\"assets/data.wav\")\n\n# Compute STFT amplitude of x.\nstft = diffsptk.STFT(frame_length=fl, frame_period=fp, fft_length=n_fft)\nX = stft(x)\n\n# Estimate mel-cepstrum of x.\nalpha = diffsptk.get_alpha(sr)\nmcep = diffsptk.MelCepstralAnalysis(\n fft_length=n_fft,\n cep_order=M,\n alpha=alpha,\n n_iter=10,\n)\nmc = mcep(X)\n\n# Reconstruct x.\nmlsa = diffsptk.MLSA(filter_order=M, frame_period=fp, alpha=alpha, taylor_order=20)\nx_hat = mlsa(mlsa(x, -mc), mc)\n\n# Write reconstructed waveform.\ndiffsptk.write(\"reconst.wav\", x_hat, sr)\n\n# Compute error.\nerror = (x_hat - x).abs().sum()\nprint(error)\n\n# Extract pitch of x.\npitch = diffsptk.Pitch(\n frame_period=fp,\n sample_rate=sr,\n f_min=80,\n f_max=180,\n voicing_threshold=0.4,\n out_format=\"pitch\",\n)\np = pitch(x)\n\n# Generate excitation signal.\nexcite = diffsptk.ExcitationGeneration(frame_period=fp)\ne = excite(p)\nn = diffsptk.nrand(x.size(0) - 1)\n\n# Synthesize waveform.\nx_voiced = mlsa(e, mc)\nx_unvoiced = mlsa(n, mc)\n\n# Output analysis-synthesis result.\ndiffsptk.write(\"voiced.wav\", x_voiced, sr)\ndiffsptk.write(\"unvoiced.wav\", x_unvoiced, sr)\n```\n\n### WORLD analysis and synthesis\n\n```python\nimport diffsptk\n\nfp = 80 # Frame period.\nn_fft = 1024 # FFT length.\n\n# Read waveform.\nx, sr = diffsptk.read(\"assets/data.wav\")\n\n# Extract F0 of x, or prepare well-estimated F0.\npitch = diffsptk.Pitch(\n frame_period=fp,\n sample_rate=sr,\n f_min=80,\n f_max=180,\n voicing_threshold=0.4,\n out_format=\"f0\",\n)\nf0 = pitch(x)\n\n# Extract aperiodicity of x by D4C.\nap = diffsptk.Aperiodicity(\n frame_period=fp,\n sample_rate=sr,\n fft_length=n_fft,\n algorithm=\"d4c\",\n out_format=\"a\",\n)\nA = ap(x, f0)\n\n# Extract spectral envelope of x by CheapTrick.\npitch_spec = diffsptk.PitchAdaptiveSpectralAnalysis(\n frame_period=fp,\n sample_rate=sr,\n fft_length=n_fft,\n algorithm=\"cheap-trick\",\n out_format=\"power\",\n)\nS = pitch_spec(x, f0)\n\n# Reconstruct x.\nworld_synth = diffsptk.WorldSynthesis(\n frame_period=fp,\n sample_rate=sr,\n fft_length=n_fft,\n)\nx_hat = world_synth(f0, A, S)\n\n# Write reconstructed waveform.\ndiffsptk.write(\"reconst.wav\", x_hat, sr)\n\n# Compute error.\nerror = (x_hat - x).abs().sum()\nprint(error)\n```\n\n### LPC analysis and synthesis\n\n```python\nimport diffsptk\n\nfl = 400 # Frame length.\nfp = 80 # Frame period.\nM = 24 # LPC dimensions.\n\n# Read waveform.\nx, sr = diffsptk.read(\"assets/data.wav\")\n\n# Estimate LPC of x.\nframe = diffsptk.Frame(frame_length=fl, frame_period=fp)\nwindow = diffsptk.Window(in_length=fl)\nlpc = diffsptk.LPC(frame_length=fl, lpc_order=M, eps=1e-5)\na = lpc(window(frame(x)))\n\n# Convert to inverse filter coefficients.\nnorm0 = diffsptk.AllPoleToAllZeroDigitalFilterCoefficients(filter_order=M)\nb = norm0(a)\n\n# Reconstruct x.\nzerodf = diffsptk.AllZeroDigitalFilter(filter_order=M, frame_period=fp)\npoledf = diffsptk.AllPoleDigitalFilter(filter_order=M, frame_period=fp)\nx_hat = poledf(zerodf(x, b), a)\n\n# Write reconstructed waveform.\ndiffsptk.write(\"reconst.wav\", x_hat, sr)\n\n# Compute error.\nerror = (x_hat - x).abs().sum()\nprint(error)\n```\n\n### Mel-spectrogram analysis and synthesis\n\n```python\nimport diffsptk\n\nfl = 400 # Frame length.\nfp = 80 # Frame period.\nn_fft = 512 # FFT length.\nn_channel = 128 # Number of channels.\n\n# Read waveform.\nx, sr = diffsptk.read(\"assets/data.wav\")\n\n# Compute STFT amplitude of x.\nstft = diffsptk.STFT(frame_length=fl, frame_period=fp, fft_length=n_fft)\nX = stft(x)\n\n# Extract log mel-spectrogram.\nfbank = diffsptk.FBANK(\n fft_length=n_fft,\n n_channel=n_channel,\n sample_rate=sr,\n)\nY = fbank(X)\n\n# Reconstruct linear spectrogram.\nifbank = diffsptk.IFBANK(\n n_channel=n_channel,\n fft_length=n_fft,\n sample_rate=sr,\n)\nX_hat = ifbank(Y)\n\n# Reconstruct x.\ngriffin = diffsptk.GriffinLim(\n frame_length=fl,\n frame_period=fp,\n fft_length=n_fft,\n)\nx_hat = griffin(X_hat, out_length=x.size(0))\n\n# Write reconstructed waveform.\ndiffsptk.write(\"reconst.wav\", x_hat, sr)\n\n# Compute error.\nerror = (x_hat - x).abs().sum()\nprint(error)\n```\n\n### Subband decomposition\n\n```python\nimport diffsptk\n\nK = 4 # Number of subbands.\nM = 40 # Order of filter.\n\n# Read waveform.\nx, sr = diffsptk.read(\"assets/data.wav\")\n\n# Decompose x.\npqmf = diffsptk.PQMF(K, M)\ndecimate = diffsptk.Decimation(K)\ny = decimate(pqmf(x))\n\n# Reconstruct x.\ninterpolate = diffsptk.Interpolation(K)\nipqmf = diffsptk.IPQMF(K, M)\nx_hat = ipqmf(interpolate(K * y)).reshape(-1)\n\n# Write reconstructed waveform.\ndiffsptk.write(\"reconst.wav\", x_hat, sr)\n\n# Compute error.\nerror = (x_hat - x).abs().sum()\nprint(error)\n```\n\n### Gammatone filter bank analysis and synthesis\n\n```python\nimport diffsptk\n\n# Read waveform.\nx, sr = diffsptk.read(\"assets/data.wav\")\n\n# Decompose x.\ngammatone = diffsptk.GammatoneFilterBankAnalysis(sr)\ny = gammatone(x)\n\n# Reconstruct x.\nigammatone = diffsptk.GammatoneFilterBankSynthesis(sr)\nx_hat = igammatone(y).reshape(-1)\n\n# Write reconstructed waveform.\ndiffsptk.write(\"reconst.wav\", x_hat, sr)\n\n# Compute error.\nerror = (x_hat - x).abs().sum()\nprint(error)\n```\n\n### Fractional octave band analysis and synthesis\n\n```python\nimport diffsptk\n\n# Read waveform.\nx, sr = diffsptk.read(\"assets/data.wav\")\n\n# Decompose x.\noband = diffsptk.FractionalOctaveBandAnalysis(sr)\ny = oband(x)\n\n# Reconstruct x.\nx_hat = y.sum(1).reshape(-1)\n\n# Write reconstructed waveform.\ndiffsptk.write(\"reconst.wav\", x_hat, sr)\n\n# Compute error.\nerror = (x_hat - x).abs().sum()\nprint(error)\n```\n\n### Constant-Q transform\n\n```python\nimport diffsptk\nimport librosa # This is to get sample audio.\n\nfp = 128 # Frame period.\nK = 252 # Number of CQ-bins.\nB = 36 # Number of bins per octave.\n\n# Read waveform.\nx, sr = diffsptk.read(librosa.ex(\"trumpet\"))\n\n# Transform x.\ncqt = diffsptk.CQT(fp, sr, n_bin=K, n_bin_per_octave=B)\nc = cqt(x)\n\n# Reconstruct x.\nicqt = diffsptk.ICQT(fp, sr, n_bin=K, n_bin_per_octave=B)\nx_hat = icqt(c, out_length=x.size(0))\n\n# Write reconstructed waveform.\ndiffsptk.write(\"reconst.wav\", x_hat, sr)\n\n# Compute error.\nerror = (x_hat - x).abs().sum()\nprint(error)\n```\n\n### Modified discrete cosine transform\n\n```python\nimport diffsptk\n\nfl = 512 # Frame length.\n\n# Read waveform.\nx, sr = diffsptk.read(\"assets/data.wav\")\n\n# Transform x.\nmdct = diffsptk.MDCT(fl)\nc = mdct(x)\n\n# Reconstruct x.\nimdct = diffsptk.IMDCT(fl)\nx_hat = imdct(c, out_length=x.size(0))\n\n# Write reconstructed waveform.\ndiffsptk.write(\"reconst.wav\", x_hat, sr)\n\n# Compute error.\nerror = (x_hat - x).abs().sum()\nprint(error)\n```\n\n### Vector quantization\n\n```python\nimport diffsptk\n\nK = 2 # Codebook size.\nM = 4 # Order of vector.\n\n# Prepare input.\nx = diffsptk.nrand(M)\n\n# Quantize x.\nvq = diffsptk.VectorQuantization(M, K)\nx_hat, indices, commitment_loss = vq(x)\n\n# Compute error.\nerror = (x_hat - x).abs().sum()\nprint(error)\n```\n\n## License\n\nThis software is released under the Apache License 2.0.\n\n## Citation\n\n```bibtex\n@InProceedings{sp-nitech2023sptk,\n author = {Takenori Yoshimura and Takato Fujimoto and Keiichiro Oura and Keiichi Tokuda},\n title = {{SPTK4}: An open-source software toolkit for speech signal processing},\n booktitle = {12th ISCA Speech Synthesis Workshop (SSW 2023)},\n pages = {211--217},\n year = {2023},\n}\n```\n",
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