Personal audio systems have been developed based on various approaches with the goal of synthesizing an isolated sound zone that avoids disturbing others in different locations. In this work, a near-field solution for a neckband headset using three loudspeakers positioned close to each ear is proposed. In particular, it is an attempt to derive a simple multichannel filter for reducing the computational cost in mobile devices. Unlike super-directive beamforming techniques, the controlled radiation pattern is not highly directional but can boost the near-field sound, thereby providing an extra sound level difference between the listener's ear locations and far-field surrounding areas. For this purpose, a multichannel filter is designed using a conventional pressure matching technique for reproducing a target signal at the ear location while suppressing sound radiation to a far-field. It is shown that the optimal filter weights can be successfully approximated in the form of a simple broadside differential array pattern. The simplified filter structure can be realized using only two second-order infinite impulse response filters for driving the middle and two side loudspeakers. Through various simulations and experiments, it is demonstrated that the proposed solution can effectively realize a personal audio system with a minimal loss of sound isolation performance.

中文翻译：

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低计算复杂度的用于颈带式耳机的个人音频系统

已经基于各种方法开发了个人音频系统，其目的是合成一个隔离的声音区域，从而避免打扰不同位置的其他人。在这项工作中，提出了使用位于每个耳朵附近的三个扬声器的颈带式耳机的近场解决方案。特别地，尝试导出用于减少移动设备中的计算成本的简单的多通道滤波器。与超指向性波束成形技术不同，受控辐射图不是高度定向的，而是可以增强近场声音，从而在听众的耳朵位置和远场周围区域之间提供额外的声级差。以此目的，使用常规的压力匹配技术设计了一种多通道滤波器，用于在耳朵位置处再现目标信号，同时抑制向远场的声音辐射。结果表明，最佳滤波器权重可以通过简单的宽边差分阵列模式成功地近似。仅使用两个二阶无限冲激响应滤波器来驱动中置和两侧扬声器，即可实现简化的滤波器结构。通过各种仿真和实验，证明了所提出的解决方案可以有效地实现具有最小的声音隔离性能损失的个人音频系统。仅使用两个二阶无限冲激响应滤波器来驱动中置和两侧扬声器，即可实现简化的滤波器结构。通过各种仿真和实验，证明了所提出的解决方案可以有效地实现具有最小的声音隔离性能损失的个人音频系统。仅使用两个二阶无限冲激响应滤波器来驱动中置和两侧扬声器，即可实现简化的滤波器结构。通过各种仿真和实验，证明了所提出的解决方案可以有效地实现具有最小的声音隔离性能损失的个人音频系统。