A hands-on approach to demonstrating active noise cancelling

Abstract

As noise pollution has become an increasingly major factor in the quality of urban life, noise cancelling methods started to be a relevant option for everyday life. Starting from the first active noise cancelling headphones build for aircraft industry in order to facilitate communication between pilots, in the last decade, active noise cancelling products have become more and more relevant. Factories, military and lately, civil usage of active noise cancelling technology transformed this industry and made it widely available. The purpose of this paper is to demonstrate a practical way of active noise cancelling using LabVIEW. Two sound waves are guided through a cylindrical conduit and at a given position, by modifying the phase and amplitudes between the two signals, an amplitude close to zero is expected.

Gaussian Distributed Noise Generator Design Using MCU-STM32

“…Errors in making decisions by the processing system generally occur because the noise signal damages the main signal to be processed. The consequence of mixing the main signal with the noise signal is that an unexpected response is generated by the system and this will lead to other undesirable consequences, such as damage to the resulting product [1] [2]. Based on the provisions in [1][2], it can be concluded that the ability of the entire system to be able to process information correctly and be able to overcome interference from noise is the main requirement to obtain the good performance of the system.…”

“…In the development of signal processing systems, both analog processing systems and digital processing systems, testing the performance of the system against noise is carried out by testing the response of the system to the composite input signal, namely the input signal that has been mixed with the noise signal [1] [2] . The noise signal is attempted to be as similar as possible to the noise signal that appears in actual environmental conditions.…”

“…A processing system is called a high-performance system if the system can suppress the noise collected along with the input signal. To test the ability of these systems against noise interference, especially testing on a laboratory scale, a device that can generate noise signals is needed as well as actual environmental noise [2]. This kind of environmental noise is known as white noise.…”