Real-Time Audio Spectrum Analyzer to Analyze Loudspeaker

Abstract

This paper, the writer implements an Audio Spectrum Analyzer application that is used to see the frequency response of the loudspeaker in real-time. This application starts with the creation of the Fast Fourier Transform (FFT) function, which calculates the amplitude value of the captured audio sound. Furthermore, making the equalizer and normalization process to set the highest amplitude value of each spectrum so that it is more easily examined. This Spectrum Analyzer application was developed using the Matlab Guide User Interface (GUI) feature. Inputs are processed in the form of sound signals captured by an RTA microphone and then processed by an external soundcard and displayed in the software. From the test results and comparison of the Audio Spectrum Analyzer application, it can be concluded that this device can also show the exact location of the spectrum.