公开(公告)号：US20070086603A1

公开(公告)日：2007-04-19

申请号：US10553774

申请日：2004-04-22

申请人： Richard Lyon ,  David Bowen ,  Gladys Unger

发明人： Richard Lyon ,  David Bowen ,  Gladys Unger

IPC分类号： H04R3/00 ,  H04R29/00

CPC分类号： H04R23/00 ,  H04R3/005 ,  H04R2201/403

摘要： A transducer senses sounds produced by a talker or other source and measures acceleration of air. Enhancement of acceleration is accompanied by reduction of the portion of the sound energy that escapes from the regions around the transducer. The result is a high sensitivity transducer, with increased privacy for use in communication systems, especially cell phones and in a multi-person environment. A pressure sensor array with a weighted output is sensitive to sound from a source talker only, and not to acoustic background noise, and not to a local loudspeaker. The weighted signal is a source sum pressure signal. The array produces a signal (using a different weighting) that corresponds to an estimate of a derivative of pressure. The derivative signal is proportional to the volume velocity fluctuations produced by the source. This signal is enhanced, rather than reduced. A local loudspeaker is driven to make the source sum pressure signal as small as desired. The loudspeaker is driven to produce volume velocity fluctuations approximately equal and opposite to those produced by the source. No compression of air arises due to the talker, and no sound is radiated into the far field. All happens because the system is driven to reduce the source pressure sum signal to below a desired threshold. It is not necessary to directly measure the volume velocity fluctuations of the talker source.

摘要翻译： 传感器检测由讲话者或其他来源产生的声音，并测量空气的加速度。 加速度的增强伴随着从换能器周围的区域逸出的声能的一部分的减少。 结果是一个高灵敏度的传感器，增加了在通信系统，特别是手机和多人环境中使用的隐私。 具有加权输出的压力传感器阵列仅对来自源讲话者的声音敏感，而不对声学背景噪声敏感，而不对本地扬声​​器敏感。 加权信号是源和压力信号。 阵列产生对应于压力导数的估计的信号（使用不同的加权）。 导数信号与源产生的体积速度波动成比例。 这个信号是增强的，而不是减少。 驱动本地扬声器使源和压力信号根据需要变小。 扬声器被驱动以产生与源产生的体积速度波动大致相等和相反的音量。 由于讲话者没有压缩空气，没有声音辐射到远场。 所有这一切都是因为系统被驱动以将源压力和信号减小到低于所需阈值。 不需要直接测量扬声器源的音量速度波动。