Download Real-Time Implementation of a Linear-Phase Octave Graphic Equalizer This paper proposes a real-time implementation of a linear-phase octave graphic equalizer (GEQ), previously introduced by the same authors. The structure of the GEQ is based on interpolated finite impulse response (IFIR) filters and is derived from a single prototype FIR filter. The low computational cost and small latency make the presented GEQ suitable for real-time applications. In this work, the GEQ has been implemented as a plugin of a specific software, used for real-time tests. The performance of the equalizer has been evaluated through subjective tests, comparing it with a filterbank equalizer. For the tests, four standard equalization curves have been chosen. The experimental results show promising outcomes. The result is an accurate real-time-capable linear-phase GEQ with a reasonable latency.
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.