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According to the Hilbert transform properties, the self-demodulated signalpsilas distortion of the single side band (SSB) method for parametric loudspeaker is analyzed theoretically by employing the orthogonal envelope detection method. It is proved that there is no distortion in the self-demodulated signal of the single side band method when a single-frequency signal is inputted, but the distortion...
A directional audible sound could be generated from the nonlinear interaction of ultrasound in the propagation medium. The demodulated audible signal is proportional to the second time derivative of the square of the ultrasound envelope, described in Berktaypsilas Far-field solution, which is nonlinear to the process of sound reproduction. Double side-band modulation (DSB) is proposed to amplitude-modulate...
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