Download Real-Time System for Sound Enhancement in Noisy Environment The noise can affect the listening experience in many real-life situations involving loudspeakers as a playback device. A solution to reduce the effect of the noise is to employ headphones, but they can be annoying and not allowed on some occasions. In this context, a system for improving the audio perception and the intelligibility of sounds in a domestic noisy environment is introduced and a real-time implementation is proposed. The system comprises three main blocks: a noise estimation procedure based on an adaptive algorithm, an auditory spectral masking algorithm that estimates the music threshold capable of masking the noise source, and an FFT equalizer that is used to apply the estimated level. It has been developed on an embedded DSP board considering one microphone for the ambient noise analysis and two vibrating sound transducers for sound reproduction. Several experiments on simulated and real-world scenarios have been realized to prove the effectiveness of the proposed approach.
Download A Non-Uniform Subband Implementation of an Active Noise Control System for Snoring Reduction The snoring noise can be extremely annoying and can negatively
affect people’s social lives. To reduce this problem, active noise
control (ANC) systems can be adopted for snoring cancellation.
Recently, adaptive subband systems have been developed to improve the convergence rate and reduce the computational complexity of the ANC algorithm. Several structures have been proposed
with different approaches. This paper proposes a non-uniform subband adaptive filtering (SAF) structure to improve a feedforward
active noise control algorithm. The non-uniform band distribution
allows for a higher frequency resolution of the lower frequencies,
where the snoring noise is most concentrated. Several experiments
have been carried out to evaluate the proposed system in comparison with a reference ANC system which uses a uniform approach.