ix

Audio Utils

To install: pip install ix

Description

The ix package provides a collection of utilities for audio processing, particularly focusing on voice and music analysis and synthesis. It includes functions for spectral analysis, voice activity detection, formant estimation, and audio compression using various techniques like LPC (Linear Predictive Coding), MDCT (Modified Discrete Cosine Transform), and more.

Main Features

• Voice Activity Detection (VAD): Detects voiced and unvoiced segments in an audio signal.
• Spectral Analysis: Functions for computing the Short-Time Fourier Transform (STFT) and its inverse, as well as other spectral transformations.
• Formant Analysis: Estimation of formant frequencies using LPC coefficients.
• Audio Compression: Implements DCT-based audio compression and decompression.
• Pitch Tracking: Implements the Harvest algorithm for robust pitch tracking.
• Feature Extraction: Converts speech waveforms to mel-generalized cepstral coefficients (MGC), which are useful in voice synthesis.
• Audio Synthesis: Reconstructs audio from spectral and cepstral representations.

Usage Examples

Voice Activity Detection

from ix import ltsd_vad
fs, audio = wavfile.read('path_to_audio.wav')
vad_audio, vad_segments = ltsd_vad(audio, fs)

Spectral Analysis

from ix import stft, istft
fs, audio = wavfile.read('path_to_audio.wav')
spectrogram = stft(audio, fftsize=512)
reconstructed_audio = istft(spectrogram, fftsize=512)

Pitch Tracking

from ix import harvest
fs, audio = wavfile.read('path_to_audio.wav')
temporal_positions, f0, vuv, f0_candidates = harvest(audio, fs)

Feature Extraction

from ix import sp2mgc
fs, audio = wavfile.read('path_to_audio.wav')
spectrogram = stft(audio, fftsize=1024)
mgc_coefficients = sp2mgc(spectrogram, order=20, alpha=0.35, gamma=-0.41)

Audio Synthesis

from ix import world_synthesis
fs, audio = wavfile.read('path_to_audio.wav')
temporal_positions, f0, vuv, f0_candidates = harvest(audio, fs)
temporal_positions, spectrogram, fs = cheaptrick(audio, fs, temporal_positions, f0, vuv)
synthesized_audio = world_synthesis(f0, vuv, spectrogram, fs)

Documentation

Each function in the ix package includes a detailed docstring with an explanation of its parameters, return values, and an example of how to use it. For further details, refer to the docstrings in the source code.