REAL TIME AUDIO EQUALIZER USING DIGITAL SIGNAL PROCESSING TECHNIQUES

Abstract

This paper outlines the design of a high-precision graphic audio equalizer with digital filters in
parallel, along with its implementation in MATLAB App Designer. The equalizer is comprised of bands
separated with a one-third octave frequency ratio, and its frequency response is controlled by 63 filters.
Furthermore, the application can process audio signals, in real time, recorded by microphone and from audio
files. While processing, it displays an FFT plot of the output sound, also in real time, equipped with a knob by
which the refreshing pace can be adjusted. The actual frequency response proved to match the desired one
accurately, but the matching is computationally demanding for the computer. An even higher accuracy would
entail a computational complexity beyond the power of ordinary computers, and was thus concluded to be
inappropriate. As a result, the final application manages to provide most laptops with both high precision and
proper functionality.