Abstract This paper describes a Digital Acoustic Projector (DAP), which is a hybrid sound system combining both a digital loudspeaker and a parametric array to convert directly an n-bits digital electrical signal into sound. It consists of a set of ultrasonic transducers emitting a sinusoidal signal modulated by a sampled and quantized low-frequency signal. Self demodulation effect is used to demodulate the acoustic signal during its propagation in the air. As a proof of concept, a DAP is designed to convert a 4-bit digital electrical signal into sound. First experimental results are presented.

中文翻译：

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数字声学投影仪——概念验证

摘要 本文介绍了一种数字声学投影仪 (DAP)，它是一种混合音响系统，结合了数字扬声器和参数阵列，可将 n 位数字电信号直接转换为声音。它由一组超声波换能器组成，发射由采样和量化的低频信号调制的正弦信号。自解调效应用于对声信号在空气中传播过程中进行解调。作为概念证明，DAP 旨在将 4 位数字电信号转换为声音。给出了第一个实验结果。