The Distortion Analysis of the Single Side Band Method for Parametric Loudspeaker Based on Orthogonal Envelope Detection
According to the Hilbert transform properties, the self-demodulated signal’s 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 is quite high when a wide-band signal is inputted, by which the incorrect concept existing for a long time that there is no distortion existing in the self-demodulated signal of the single side band method is rectified. Furthermore, a squared envelope distortionless condition for the signal processing methods of parametric loudspeaker is presented to provide an effective criterion for their development. A method to reduce the inter-modulation distortion of the single side band method for parametric loudspeaker by introducing a modulation factor is proposed, and it is also claimed that the method will result in a lower output power of the self-demodulated signal.
Orthogonal Envelope Detection Parametric Loudspeaker Single Side Band Method Distortion of Self-Demodulated Signal Squared Envelope Distortionless Condition
Min Chen Xiao Qin Leon Xu Yang Du Limei Xu
Institute of Astronautics&Aeronautics,University of Electronic Science and Technology of China,Cheng Nokia Research Center Beijing,Beijing,100176,China School of Computer Science&Engineering,University of Electronic Science and Technology of China,Chen
国际会议
深圳
英文
253-257
2008-12-10（万方平台首次上网日期，不代表论文的发表时间）