The vocoder employed here is derived from GlottDNN vocoder, now featuring the integration of the LF glottal modelling. https://github.com/ljuvela/GlottDNN

This classic LF program referred some Matlab code from the original @ Voice_Analysis_Toolkit https://github.com/jckane/Voice_Analysis_Toolkit written by John Kane (Phonetics and Speech Laboratory, Trinity College Dublin) in Matlab, now re-factored and re-written in C++ for better integration for copy-syn and DNN training in GlottDNN: Author: Xiao Zhang (Phonetics and Speech Laboratory, Trinity College Dublin) zhangx16@tcd.ie

LF Glottal model pulses (top), flow derivative (bottom).Figure from (Dr. Christer Gobl https://www.tcd.ie/research/profiles/?profile=cegobl)

Configuration folder reference list. The files obtained from the analysis stage of Tolg are colored red, whereas those from the synthesize stage are colored blue. The conditional feature, which depends on the value of in the configuration file, is denoted by *.

Generating the LF glottal excitation signal from the proposed neural Tolg together with the classical Tolg vocoder and LF glottal flow output from GIF.

The Tolg package contains two main parts:

1. The LF glottal vocoder written in C++

   • Dependencies: libsndfile, libgsl, libconfig

2. Python scripts for LF vocoder analysis, synthesis and training a DNN excitation model:

   • Dependencies: python3, numpy, pytorch>=1.1.0

1. Instantly tunable LF Vocoder for Voice Quality: Easily enhance your voice quality with just a single command-line command. eg: Change the parameter under the file, the default value is 1.0:

tolg/dnn_demo/config_dnn_demo.cfg

RD_RATIO =                   1.0;

Here is the tuning cmd line:

./src/Analysis <./demo.wav> ../dnn_demo/config_dnn_demo.cfg

here is an example:

./src/Analysis ../dnn_demo/data/wav/slt_arctic_a0001.wav ../dnn_demo/config_dnn_demo.cfg

Here is the modified Rd value:

RD_RATIO =                   1.5;

It can globally tune your Rd values by multiplying them by 1.5.

(Notice: the Rd_ratio value is a double number, so the decibel is compulsory) The tuned audio file will be generated under the same path of <./demo.wav>.

2. Synthesize LF excitation signals using a DNN-based approach

The vocoder C++ code has the following library dependencies:

• libgsl (GNU scientific library), for basic linear algebra and FFT etc.
• libsndfile for reading and writing audio files
• libconfig++ for reading structured configuration files

Usually the best way to install the dependencies is with the system package manager. For example, in Ubuntu use apt-get install the packages libgsl0-dev, libsndfile1-dev, libconfig++-dev

The C++ part uses a standard GNU autotools build system. To compile the vocoder, run the following commands in the project root directory

   ./configure
   make

Since the build targets are rather generically named Analysis and Synthesis, you might not want them in your default system PATH. Use the --prefix flag to choose another install path

   ./configure --prefix=/your/install/path/bin
   make install

Usually configure and make should be enough, but if the process complains about missing files try running

automake --add-missing

Conda environments are useful for managing dependencies and keeping a Tolg installation contained from the systemwide environment. For more information about managing conda enviroments, see https://docs.conda.io/projects/conda/en/latest/user-guide/tasks/manage-environments.html

Create and activate a new conda environment.

conda create -n Tolg
conda activate Tolg

Install dependencies

conda install -c conda-forge libsndfile gsl libconfig 

Optionally, install pytorch with conda

conda install pytorch torchaudio -c pytorch

Set compiler flags to compiler flags to point to the currently active conda environment. The compiled binaries will be installed in $CONDA_PREFIX/bin/

export LDFLAGS=-L$CONDA_PREFIX/lib/ 
export CPPFLAGS=-I$CONDA_PREFIX/include/
./configure --prefix $CONDA_PREFIX
make
make install

Library dependencies are linked dynamically, so we need to make sure they are is visible in LD_LIBRARY_PATH. Adding an env_vars.sh activate script is a convenient way to do this automatically whenever the conda environment is activatied.

# any shell scripts in these directories are run at activation/deactivation
mkdir -p $CONDA_PREFIX/etc/conda/activate.d
mkdir -p $CONDA_PREFIX/etc/conda/deactivate.d

# modify LD_LIBRARY_PATH at activation
export ACTIVATE_SCRIPT=$CONDA_PREFIX/etc/conda/activate.d/env_vars.sh
echo 'export OLD_LD_LIBRARY_PATH=${LD_LIBRARY_PATH}' > $ACTIVATE_SCRIPT
echo 'export LD_LIBRARY_PATH='${CONDA_PREFIX}'/lib/:${LD_LIBRARY_PATH}' >> $ACTIVATE_SCRIPT

# restore LD_LIBRARY_PATH state at deactivation
export DEACTIVATE_SCRIPT=$CONDA_PREFIX/etc/conda/deactivate.d/env_vars.sh
echo 'export LD_LIBRARY_PATH=${OLD_LD_LIBRARY_PATH}' > $DEACTIVATE_SCRIPT
echo 'unset OLD_LD_LIBRARY_PATH' >> $DEACTIVATE_SCRIPT

python3 ./python/TolgDnnScript.py ./dnn_demo/config_dnn_demo.py

The present version requires pytorch>=1.1.0 and all theano dependencies have been removed.

Note that the following is a toy example, since we now use only 10 audio files. This example is intended as a quick sanity check and can be easily run on a CPU. For more data and more complex models, a GPU is recommended.

Before we run anything, you can modify the configuration files below:

./dnn_demo/config_dnn_demo.py

Then run the example script by running

python3 ./python/TolgScript.py ./dnn_demo/config_dnn_demo.py

The demo script runs vocoder analysis, trains a DNN excitation model, and finally applies copy-synthesis to the samples. After running, the copy-synthesis results are stored in ./dnn_demo/data/syn and the original wave files are in ./dnn_demo/data/wav.

Upon executing this example, the analyzed files can be located in the respective directories specified below, accompanied by their corresponding file extensions.

The expected outcome should consist of the following files:

ls ./data/dnn_demo/data
    /tolg/dnn_demo/data/ee
    /tolg/dnn_demo/data/exc
    /tolg/dnn_demo/data/f0
    /tolg/dnn_demo/data/gain
    /tolg/dnn_demo/data/gci
    /tolg/dnn_demo/data/hnr
    /tolg/dnn_demo/data/lf_pulse
    /tolg/dnn_demo/data/pls
    /tolg/dnn_demo/data/ra
    /tolg/dnn_demo/data/rd
    /tolg/dnn_demo/data/reaper_f0
    /tolg/dnn_demo/data/reaper_gci
    /tolg/dnn_demo/data/rg
    /tolg/dnn_demo/data/rk
    /tolg/dnn_demo/data/scp
    /tolg/dnn_demo/data/slsf
    /tolg/dnn_demo/data/syn
    /tolg/dnn_demo/data/wav    

You can read the f0 file by:

x2x +fa slt_arctic_a0001.f0 > output.txt

Here is to convert an Asscii file into float number.

Now run Tolg Analysis program with default configuration

./src/Analysis "$DATADIR/$BASENAME.wav" ./config/config_default_16k.cfg
or
./src/Analysis "$DATADIR/$BASENAME.wav" ./src/config_default_16k.cfg

Prepare a directory structure under and make file lists based on contents of the wav sub-directory

make_dirs = 1
make_scp = 1

Use Tolg to extract glottal vocoder features and pulses for excitation model training.

do_glott_vocoder_analysis = 1

Package data and train an excitation model for Tolg, as supported by the internal implementation. Uses theano for training and only supports simple fully connected nets with least squares training.

make_dnn_train_data = 1
make_dnn_infofile = 1
do_dnn_training = 1

Do copy synthesis (using the internal implementation of DNN excitation)

do_glott_vocoder_synthesis = 1