用单个扬声器实现高对比度声区控制，突破传统多扬声器限制。
Generating Localized Audible Zones Using a Single-Channel Parametric Loudspeaker
- 将不同音频调制到多个超声载波，通过单个扬声器发射复合信号。
- 利用空气非线性解调，虚拟生成多通道输出，实现声区分离。
- 可直接复用原为多扬声器设计的声区算法，适合空间受限场景。
先进的声区控制（SZC）技术通常依赖大规模多通道扬声器阵列以实现高对比度个人声区，使得单扬声器实现SZC看似不可能。本文挑战这一范式，提出多载波参数扬声器（MCPL），仅用一个扬声器即可实现SZC。方法是将不同音频信号分别调制到不同频率的超声载波上，合并成单一复合信号，由单通道超声换能器发射。在空气中通过非线性解调，音频信号相互作用，虚拟形成多通道输出。这一新能力使原本为多通道阵列设计的SZC算法得以应用。仿真验证了所提单通道MCPL的有效性，表明其作为传统多扬声器系统的高效替代方案具有潜力。本工作为简化声区控制系统开辟了新路径，且不牺牲性能。
原文摘要 · Abstract (English)
Advanced sound zone control (SZC) techniques typically rely on massive multi-channel loudspeaker arrays to create high-contrast personal sound zones, making single-loudspeaker SZC seem impossible. In this Letter, we challenge this paradigm by introducing the multi-carrier parametric loudspeaker (MCPL), which enables SZC using only a single loudspeaker. In our approach, distinct audio signals are modulated onto separate ultrasonic carrier waves at different frequencies and combined into a single composite signal. This signal is emitted by a single-channel ultrasonic transducer, and through nonlinear demodulation in air, the audio signals interact to virtually form multi-channel outputs. This novel capability allows the application of existing SZC algorithms originally designed for multi-channel loudspeaker arrays. Simulations validate the effectiveness of our proposed single-channel MCPL, demonstrating its potential as a promising alternative to traditional multi-loudspeaker systems for achieving high-contrast SZC. Our work opens new avenues for simplifying SZC systems without compromising performance.
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