Title :
Weighted double sideband modulation toward high quality audible sound on parametric loudspeaker
Author :
Ikefuji, Daisuke ; Nakayama, Makoto ; Nishiura, Takanobu ; Yamashita, Yukihiko
Author_Institution :
Grad. Sch. of Inf. Sci. & Eng., Ritsumeikan Univ., Kusatsu, Japan
Abstract :
Recently, parametric loudspeakers have been utilized to reproduce an audible sound in a particular area by an ultrasound. However, parametric loudspeakers have lower sound quality than general electrodynamic loudspeakers because it is difficult to reproduce an audible sound at lower frequency. Moreover, the reproduced sound includes harmonic distortions causing deterioration of sound quality. Thus, in this paper, we attempt to improve sound quality of parametric loudspeakers. It depends on a modulation technique for designing the amplitude modulated wave. Therefore, we propose a new modulation method to reproduce audible sound with high quality. The proposed method controls a weight of double sidebands for reducing harmonic distortions at higher frequency and emphasizing power at lower frequency. We carried out evaluation experiments to confirm the effectiveness of the proposed method. The results confirmed that the proposed method could improve sound quality of parametric loudspeakers.
Keywords :
acoustic distortion; amplitude modulation; audio signal processing; loudspeakers; amplitude modulated wave; electrodynamic loudspeakers; harmonic distortions; high quality audible sound; modulation technique; parametric loudspeakers; reproduced sound; sound quality deterioration; ultrasound; weighted double sideband modulation; Amplitude modulation; Frequency control; Frequency modulation; Harmonic distortion; Loudspeakers; Universal Serial Bus; Amplitude modulation; Modulation method; Parametric loudspeaker; Weighted sideband;
Conference_Titel :
Acoustics, Speech and Signal Processing (ICASSP), 2013 IEEE International Conference on
Conference_Location :
Vancouver, BC
DOI :
10.1109/ICASSP.2013.6637767