timschneeb / geq2imp

Create impulse responses from CSV frequency responses

geq2imp

Convert GraphicEQ *.csv to impulse responses

Usage • Installation • Credits • License

Usage

This console app supports frequency response *.csv files generated by JamesDSP's or EqualizerAPO's GraphicEQ widget. To generate one with JamesDSP, navigate to the GraphicEQ tab, click on the right arrow on the bottom right and choose 'Export'.

General usage:

> geq2imp --help
Usage: geq2imp [options]
Converts GraphicEQ CSV files to impulse responses.
CSV files (tab-separated) can be exported using JDSP4Linux or EqualizerAPO.

Options:
  -h, --help                      Displays help on commandline options.
  --help-all                      Displays help including Qt specific options.
  -v, --version                   Displays version information.
  -s, --srate <srate>             Set target sampling rate (default: 48000Hz)
  -o, --output <output-file>      Output impulse response file (default:
                                  output.wav)
  -l, --left <left-input-file>    CSV file for left channel
  -r, --right <right-input-file>  CSV file for right channel
  -m, --mono <input-file>         CSV file for both channels

Create an IR with different frequency responses for the left and right side:

> geq2imp --left testL.csv --right testR.csv --output response.wav --srate 48000
16384 samples written to 'response.wav'

Installation

Install dependencies

If your distro is not included here, you need to research which packages to install by yourself.

Debian/Ubuntu-based distros

sudo apt install build-essential qtbase5-dev

Fedora

sudo dnf install make gcc gcc-c++ qt5-qtbase-devel

Arch Linux

sudo pacman -S base-devel qt5-base

Build application

Clone git repository

git clone https://github.com/ThePBone/geq2imp

Prepare build environment

cd geq2imp
mkdir build
cd build

Compile application

qmake ../geq2imp.pro
make -j4

Execute compiled binary

./src/geq2imp

If you want to want the binary to be accessible from everywhere, for all users, run this line:

sudo cp ./src/geq2imp /usr/local/bin/

Credits

• James Fung - Developer of the library 'libjamesdsp'

License

This project is licensed under GPLv3.

THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR IMPLIED, 
INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. 
IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, 
WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR 
THE USE OR OTHER DEALINGS IN THE SOFTWARE.

geq2imp's Issues

Outside of the specified bands, the frequency response should be flat?

Here is my test report.

Although this is the first time that I try to compile application,
I got no trouble at all. Document is well done.
Then, I get an error when executes it.
It cannot find the .csv in the current folder.
The problem is solved by giving filename with path.
I am new to Linux.
I am not sure if this is a bug or my poor knowledge of commend line convention.
But the output filename without path is OK.

The .wav works with convolution.
The music sounds great, and the vocal appears in the center as expected. :)

Out of curiosity, I decide to make a measurement.
Unfortunately, I had some troubles to install REW on Linux.
The following is running with Equalizer APO in Windows 7.

https://i.imgur.com/f0I15f8.png

The green line is Graphic EQ. The CSVs are exported from here.
The blue line is convolution with impulse response.
Above 100 Hz, two lines are almost identical.
Between 50 Hz and 100 Hz, we can see some small differences.
Below 50 H, green line keeps flat as blue line goes down.
This is explained in the document of Equalizer APO.

https://sourceforge.net/p/equalizerapo/wiki/Configuration%20reference/#graphiceq-since-version-10

Adds a graphic equalizer with the specified number of bands and corresponding gain values. The gain values are interpolated linearly in the logarithmic frequency spectrum (so that the lines appear linear in a logarithmic view) between the specified bands. Outside of the specified bands, the frequency response is flat.

It's up to you whether to follow Equalizer APO standard.
Maybe this also affects the small differences between 50 and 100Hz.
I don't have golden ears. Current version is good enough for me.
You remove the stone that keeps me from moving to Linux.
Thank you.