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第 38 卷 第 3 期                                                                       Vol. 38, No. 3
             2019 年 5 月                          Journal of Applied Acoustics                      May, 2019

             ⋄ 研究报告 ⋄



                平板扬声器立体声重放的振动对比度控制方法                                                                    ∗





                                         李子庆     1,2   罗平展     1,2   李晓东     1,2†


                                              (1 中国科学院声学研究所       北京   100190)
                                                (2 中国科学院大学      北京  100049)

                摘要    利用激振器阵列通过振动对比度控制方法实现了在平板扬声器上重放立体声的声源局域化控制。首先
                利用激振器到测量点的导纳函数，最大化辐射区和整个平板振动区域的平均动能比值得到阵列的最优空间滤
                波器。然后分别计算最大化左右声道辐射区和整个振动区域平均动能比值的最优滤波器。最后将立体声信
                号分别通过对应辐射区最优滤波器滤波相加后，馈给激振器阵列激励平板在两辐射区辐射对应声道的信号。
                利用 8 个激振器控制 0.48 m 长、0.27 m 宽、0.001 m 厚铝板，在 100 Hz∼2000 Hz 范围内，振动对比度的均值为
                12 dB。因此该方法可以获得较好的局域化控制效果，进而可以将左右声道的声源局域在平板扬声器的两侧。
                关键词     平板扬声器，立体声，声源局域化，振动对比度控制
                中图法分类号: O429           文献标识码: A          文章编号: 1000-310X(2019)03-0307-10
                DOI: 10.11684/j.issn.1000-310X.2019.03.004





                      Vibrational contrast control for stereo audio reproduction on flat
                                                  panel loudspeaker


                                      LI Ziqing 1,2  LUO Pingzhan 1,2  LI Xiaodong 1,2

                               (1 Institute of Acoustics, Chinese Academy of Sciences, Beijing 100190, China)

                                   (2 University of Chinese Academy of Sciences, Beijing 100049, China)
                 Abstract  A vibrational contrast control method is proposed for stereo audio reproduction on a thin plate,
                 which is based on maximizing the contrast of the average energy of transverse motion between the radiated
                 zone and the entire vibration zone. Firstly, the optimal filter group for the actuator array is obtained by using
                 the mobility functions from the actuators to the measurement points. Secondly, the optimal filter groups for
                 the left channel signals and the right channel signals are obtained to maximize the average kinetic energy of
                 the left radiated zone and the right radiated zone respectively. Finally, the stereo audio signals are played by
                 the corresponding radiated zone. Experimental results on a 0.480 m by 0.270 m by 0.001 m thick aluminum
                 panel with 8 actuators show that the contrast level is about 12 dB for the frequency band from 100 Hz to 2000
                 Hz. Therefore, high contrast level can be achieved and the stereo audio can be played on a single flat panel
                 loudspeaker.
                 Key words   Flat panel loudspeaker, Stereo audio, Sound source localization, Vibrational contrast control



             2018-09-27 收稿; 2018-12-28 定稿
             国家自然科学基金项目 (61571435, 61801468), 中国科学院声学研究所青年英才计划项目 (QNYC201813)
             ∗
             作者简介: 李子庆 (1989- ), 男, 山东菏泽人, 博士研究生, 研究方向: 声信号处理。
              通讯作者 E-mail: lxd@mail.ioa.ac.cn
             †
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