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Parselmouth

Parselmouth - Praat in Python, the Pythonic way

PyPI Gitter chat GitHub Actions status pre-commit.ci status ReadTheDocs status License Launch Binder

Parselmouth is a Python library for the Praat software.

Though other attempts have been made at porting functionality from Praat to Python, Parselmouth is unique in its aim to provide a complete and Pythonic interface to the internal Praat code. While other projects either wrap Praat's scripting language or reimplementing parts of Praat's functionality in Python, Parselmouth directly accesses Praat's C/C++ code (which means the algorithms and their output are exactly the same as in Praat) and provides efficient access to the program's data, but also provides an interface that looks no different from any other Python library.

Drop by our Gitter chat room or post a message to our Google discussion group if you have any question, remarks, or requests!

Try out Parselmouth online, in interactive Jupyter notebooks on Binder.

Installation

Parselmouth can be installed like any other Python library, using (a recent version of) the Python package manager pip, on Linux, macOS, and Windows:

pip install praat-parselmouth

or, to update your installed version to the latest release:

pip install -U praat-parselmouth

For more detailed instructions, please refer to the documentation.

Example usage

import parselmouth

import numpy as np
import matplotlib.pyplot as plt
import seaborn as sns

sns.set() # Use seaborn's default style to make attractive graphs

# Plot nice figures using Python's "standard" matplotlib library
snd = parselmouth.Sound("docs/examples/audio/the_north_wind_and_the_sun.wav")
plt.figure()
plt.plot(snd.xs(), snd.values.T)
plt.xlim([snd.xmin, snd.xmax])
plt.xlabel("time [s]")
plt.ylabel("amplitude")
plt.show() # or plt.savefig("sound.png"), or plt.savefig("sound.pdf")

docs/images/example_sound.png

def draw_spectrogram(spectrogram, dynamic_range=70):
    X, Y = spectrogram.x_grid(), spectrogram.y_grid()
    sg_db = 10 * np.log10(spectrogram.values)
    plt.pcolormesh(X, Y, sg_db, vmin=sg_db.max() - dynamic_range, cmap='afmhot')
    plt.ylim([spectrogram.ymin, spectrogram.ymax])
    plt.xlabel("time [s]")
    plt.ylabel("frequency [Hz]")

def draw_intensity(intensity):
    plt.plot(intensity.xs(), intensity.values.T, linewidth=3, color='w')
    plt.plot(intensity.xs(), intensity.values.T, linewidth=1)
    plt.grid(False)
    plt.ylim(0)
    plt.ylabel("intensity [dB]")

intensity = snd.to_intensity()
spectrogram = snd.to_spectrogram()
plt.figure()
draw_spectrogram(spectrogram)
plt.twinx()
draw_intensity(intensity)
plt.xlim([snd.xmin, snd.xmax])
plt.show() # or plt.savefig("spectrogram.pdf")

docs/images/example_spectrogram.png

def draw_pitch(pitch):
    # Extract selected pitch contour, and
    # replace unvoiced samples by NaN to not plot
    pitch_values = pitch.selected_array['frequency']
    pitch_values[pitch_values==0] = np.nan
    plt.plot(pitch.xs(), pitch_values, 'o', markersize=5, color='w')
    plt.plot(pitch.xs(), pitch_values, 'o', markersize=2)
    plt.grid(False)
    plt.ylim(0, pitch.ceiling)
    plt.ylabel("fundamental frequency [Hz]")

pitch = snd.to_pitch()
# If desired, pre-emphasize the sound fragment before calculating the spectrogram
pre_emphasized_snd = snd.copy()
pre_emphasized_snd.pre_emphasize()
spectrogram = pre_emphasized_snd.to_spectrogram(window_length=0.03, maximum_frequency=8000)
plt.figure()
draw_spectrogram(spectrogram)
plt.twinx()
draw_pitch(pitch)
plt.xlim([snd.xmin, snd.xmax])
plt.show() # or plt.savefig("spectrogram_0.03.pdf")

docs/images/example_spectrogram_0.03.png

# Find all .wav files in a directory, pre-emphasize and save as new .wav and .aiff file
import parselmouth

import glob
import os.path

for wave_file in glob.glob("audio/*.wav"):
    print("Processing {}...".format(wave_file))
    s = parselmouth.Sound(wave_file)
    s.pre_emphasize()
    s.save(os.path.splitext(wave_file)[0] + "_pre.wav", 'WAV') # or parselmouth.SoundFileFormat.WAV instead of 'WAV'
    s.save(os.path.splitext(wave_file)[0] + "_pre.aiff", 'AIFF')

More examples of different use cases of Parselmouth can be found in the documentation's examples section.

Documentation

Documentation is available at ReadTheDocs, including the API reference of Parselmouth.

Development

Currently, the actual project and Parselmouth's code is not very well documented. Or well, hardly documented at all. That is planned to still change in order to allow for easier contribution to this open source project. Until that day in some undefined future, if you want to contribute to Parselmouth, do let me know on Gitter or by email, and I will very gladly guide you through the project and help you get started.

Briefly summarized, Parselmouth is built using cmake. Next to that, to manually build Parselmouth, the only requirement is a modern C++ compiler supporting the C++17 standard.

Acknowledgements

  • Parselmouth builds on the extensive code base of Praat by Paul Boersma, which actually implements the huge variety of speech processing and phonetic algorithms that can now be accessed through Parselmouth.
  • In order to do so, Parselmouth makes use of the amazing pybind11 library, allowing to expose the C/C++ functionality of Praat as a Python interface.
  • Special thanks go to Bill Thompson and Robin Jadoul for their non-visible-in-history but very valuable contributions.

License