Case Study - Stellantis - Development of the Audio Quality Tool app

Challenge

This project came up given the need to visualize background noise of audio files in a more user-friendly way. To that end, the Audio Quality Tool application was developed, which allows audio files to be classified and displayed in a way that can be understood by all users.

The application receives a set of audio files and classifies each one according to the background noise found. At the end of the sorting process, users can know which parts of the audio file have good quality, or not.

Additionally, the application allows quality comparisons between different audio files through intuitive graphics for users.

Solution

Three major components were developed with well-defined purposes:

Audio Quality Tool: application developed in Java Swing, responsible for receiving the user's audio files and sending them to the Python Package, so that they can be classified. This component is also responsible for presenting the results to the users;
Python Package: component developed in Python to allow the classification of audio files. This classification was possible thanks to the several data mining and machine learning libraries that python language natively has.
Besides allowing the classification, this component also generates CSV files with the classification for each time instant of the audio file;
License Key: component developed in Java Swing, which allows the creation and management of licenses.
Due to security issues within the PSA Group - also known as Peugeot S.A. or PSA Peugeot Citroën -, it was necessary to develop licenses based on advanced cryptography, so that only certain duly authorized users within the PSA Group could access the Audio Quality Tool application (to enter the application, the user would have to have a license duly installed on his computer, which had reliable information about it).
Only then could certain users use the application. In addition, the Group Administrator could manage the licenses and allocate them to the users he wanted.