Processamento digital de sinais de áudio em microcontrolador

Abstract

In this work, IIR (infinite impulse response) digital filters were developed that act on audio signals through a microcontroller, aiming at magnitude changes. The work is justified by the advantages of using microcontrollers, mainly its portability. The filters act in real time and can have amplitude changes, that is, it is possible to change the attenuations and gains as their coefficients are changed by a proportional value. Control is done in 5 divisions of the audible range (low, mid-low, mid, mid-high and high). To evaluate the sound system, objective and subjective measurement techniques were used. In view of these points, the proposed work can contribute to similar research and bring improvements to digital systems.