• Implementation of An efficient implementation of the Patterson-Holdsworth auditory filter bank, Slaney, 1993.

• A lot of open source implementations have been proposed over years, mainly in Matlab or python, few in C or C++. Among these, libgammatone aims to be standard C++ implementation, suitable for research and engineering purpose.

  • Documented and tested
  • Clear and extensible interface
  • Fast and efficient

• Here a minimal working exemple

    #include <gammatone/filter.hpp>
    #include <vector>

    int main()
    {
        // Init a gammatone filter sampled at 44.1 kHz, centered at 1 kHz
        gammatone::filter<double> filter(44100, 1000);

        // An input signal (here 1000 times zero, silly but minimal)
        std::vector<double> input(1000, 0.0);

        // Init an output buffer to store the filter response
        std::vector<double> output(1000);

        // Compute the output signal from input
        filter.compute_range(input.begin(), input.end(), output.begin());

        return 0;
    }

Retrieve the code from github:

    git clone https://github.com/mmmaat/libgammatone.git

• After cloning, you have the libgammatone headers in ./libgammatone/include.
• You must have this dircetory in your include path in order to compile your code with libgammatone.
• You must compile with the -std=c++11 flag (tested on GCC 4.9.2).

Have a look to doc/exemple/src/minimal.cpp.

This minimal exemple initializes a gammatone filter and process an empty input signal. Compile it with:

g++ -std=c++11 -o minimal minimal.cpp -I/path/to/libgammatone/include

It work ? Great, you are now ready to read the [tutorial](@ref tutorial) !

If you want to build documentation and tests you need the following programs:

• cmake to configure and compile,
• gnuplot and gnuplot-iostream to plot some tests output,
• doxygen to build the documentation.
• boost for the unit test framework

On a Debian/Ubuntu system, install it with:

sudo apt-get install libboost-dev doxygen gnuplot libgnuplot-iostream-dev cmake

You should place the build tree away from the source tree. For exemple in ./libgammatone create a build directory from where you run cmake:

mkdir ./build
cd ./build
cmake ..

Then type make help to see all the available targets. Here are some interesting ones...

make html       # Generates the HTML documentation. Main page is doc/html/index.html
make tests      # Generates standalone tests in bin
make unit       # Generates a unit test executable bin/unit
make unit-all   # Generates a bigger unit test executable bin/unit-all

libgammatone is free software: you can redistribute it and/or modify it under the terms of the GNU General Public License as published by the Free Software Foundation, either version 3 of the License, or (at your option) any later version.

libgammatone is distributed in the hope that it will be useful, but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for more details. You should have received a copy of the GNU General Public License along with libgammatone. If not, see https://www.gnu.org/licenses/.