Puri, Amrita

To overcome the limitations of the Fourier nonlinear filter and even mirror Fourier nonlinear filter-based adaptive algorithms for active noise control, this paper introduces boosted Fourier nonlinear filter and boosted even mirror Fourier nonlinear filter algorithms. Weight updating equations for the proposed algorithms are derived. Their performance is compared with Fourier nonlinear filter and even mirror Fourier nonlinear filter. Experimentally recorded bandsaw and compressor noises are utilized for the analysis. The analysis is carried out for (a) linear primary and linear secondary paths, and (b) nonlinear primary path and linear secondary path. Visual inspection of residual noises after control and dB values of residual noises are utilized to understand the performance of the developed algorithms.

With multichannel sound rendering systems, an immersive sound can be experienced by a broader audience. Rendering of a stationary source is widely studied in the literature. However, a dynamic sound, where the source's position is continuously changing, provides improved source localization and a listener experience more immersed in the rendered sound. This paper investigates the multichannel sound rendering of a dynamic sound source using a wave field synthesis method in a reverberant shoe-box room model. Finite difference time domain is employed to visualize the reproduced sound field in the time domain. To address the challenge of room echo-induced degradation in sound quality, a method is presented inwhich the reflected sound is compensated by rendering the primary source's images from the auxiliary actuators, enhancing SNR by approximately 2-3.5 dB.

When synthesizing a dynamic sound field using a multichannel loudspeaker array, incorporating moving sound scenes enhances the immersive experience for listeners. Previous studies have explored the synthesis of a moving sound source situated outside the region enclosed by an array of loudspeakers, generally termed a nonfocused moving sound source. This paper presents the synthesis of a moving sound source inside the region enclosed by a loudspeaker array, termed a focused moving source. The driving signals for the loudspeakers are derived using the principle of wave field synthesis. Computer simulations have been conducted to evaluate the effectiveness of the proposed driving signals in synthesizing a focused moving point source. © 2025, Audio Engineering Society. All rights reserved.