Simulasi Pemrosesan Sinyal Suara untuk Sistem Aktif Kendali Kebisingan pada Knalpot (Noise Silencer)

Abstract

Active Noise Control is a technique to overcome noise through noise versus noise method. This technique is intended to reduce the noise as minimal as possible and, moreover, it can eliminate the noise if signal reduction can be perfectly done. The signal processing is by making signal amplitude and opponent signal frequency (anti signal) turn the phase around 180° of the signal source to produce a signal reduction. This noise reduction is processed by means of signal processing method. In this research, the researcher used a Noise Signal Generator and Phase Shifter as anti noise or anti signal. This anti noise will produce anti signal by reversing the signal phase 180° that functions to counter the sound source that is silencer. In this research, a noise signal processor was designed as simple as possible and it's very complicated noise signal randomness was analyzed that the signal processing calculation can be simpler. The result of the research shows that the displacement of phase in the form of frequency and amplitude has the difference of 33.3%. This value was obtained from the result of the comparison between source signal and generator signal. It can be concluded from the result of the research that noise signal has been reduced for 33.3%. To obtain the value of 0% in order to reach perfect reduction, the phase must be shifted for 66.7%. Yet, the elimination of noise is likely hard or even impossible to do. For that reason, this research is one of the ways to obtain a bigger percentage of noise reduction through active noise control approach to achieve the comfort of sound.