Speech-Leakage Reduction for Pin-Spot Audio Based on Multiple Sideband Waves Using Comb Filters

We propose a method for reducing speech leakage in pin-spot audio systems using parametric array loudspeakers by generating multiple sideband waves using a comb filter. A problem with pin-spot audio systems is that signals with harmonic structures are generated and heard as speech due to multiple sideband wave components caused by the harmonic structure of the speech. The proposed method reduces speech leakage outside the audio spot by disrupting the harmonic structure of the leaked speech and making it indistinct. From the results from conducting an evaluation experiment on the proposed method indicate its effectiveness.