The focus of this work is on the implementation of a digital filter for white noise reduction in audio signals. This study explores the use of advanced techniques such as Fourier Series and Z-Transform to design an effective filter to improve the sound quality of audio signals. The filter is simulated using specialized software, and it is expected that this methodology will lead to a significant improvement in audio reproduction. This approach not only has practical applications in music production and sound engineering, but also contributes to technological progress in digital audio filtering. The project is being developed at the Technical University of Cotopaxi in Ecuador, with the ultimate goal of optimizing sound quality in audio devices and communication systems.