压电式语音主动干扰器可以有效防止激光窃听技术通过玻璃等薄壁结构拾取室内的语音信号，还可以产生虚假信号欺骗对方，具有较高的应用价值。其中的功率放大电路是压电式语音干扰器的关键模块，其性能直接影响语音干扰的效果。本文基于 PAM8902H 功率放大芯片设计了一款压电式语音主动干扰器，在此基础上对功率放大电路及其性能进行测试。正弦输入信号测试表明，放大模块输出性能受输入电压、负载、供电电压等多方面的耦合影响，在 32. 5 dB 增益模式下截止频率可达到 2 600 Hz，比 21 dB 增益模式更能满足宽频驱动要求，且较难出现高频失真现象；语音干扰测试表明，压电式语音干扰器可使被测玻璃在 20 Hz~8 kHz 频段内显著提升振动幅值，有效实现了声学干扰效果。此外，干扰器在典型工况下续航时间约为 3. 2 h，在功耗控制与运行稳定性方面具有良好的工程适用性。

A piezoelectric active voice jammer can efficiently prevent laser eavesdropping technology from picking up indoor voice signals through thin-walled structures such as glass and can also generate false signals to deceive the other party， thus rendering high application value to it. A power amplifier circuit is a key module in a piezoelectric voice jammer and its performance directly affects the extent of voice jamming achieved. Based on the PAM8902H power amplifier chip， a piezoelectric active voice jammer was designed in this study and the power amplifier circuit and its performance were tested. The sine input signal test showed that the output performance of the amplifier module was affected by various coupling factors such as the input voltage， load， and supply voltage. In the 32. 5 dB gain mode， the band cutoff frequency reached 2 600 Hz， which is more capable of meeting the wideband drive requirements compared to the 21 dB gain mode and is less prone to high-frequency distortion. Results of the acoustic interference test indicated that the piezoelectric acoustic jammer significantly enhanced the vibration amplitude of the tested glass within the frequency range of 20 Hz to 8 kHz， thus efficiently achieving acoustic interference. Additionally， the jammer had a battery life of approximately 3. 2 h under typical operating conditions and demonstrated good engineering applicability in terms of power consumption control and operational stability.

TN384；TN64

国家自然科学基金资助项目（U2436204，52572410）