针对厅堂扩声系统的传声增益问题,设计了一种模拟滤波式声反馈抑制装置.该装置采用单片机进行数据处理与控制决策,采用LC串联谐振带阻滤波器抑制因声反馈产生的自激振荡,通过由单片机控制的电磁继电器切换LC串联谐振回路中的电感与电容实现中心频率在音频频带内的任意调节.实践证明:该装置电路结构简单、使用方便、适应性强,可以有效抑制各种厅堂因声反馈产生的自激振荡. Aiming at the problem of acoustic gain of the hall sound reinforcement system, an analog filter-type acoustic feedback suppression device is designed. The device adopts single chip microcomputer for data processing and control decision. The LC series resonant band-stop filter is used to suppress the self-excitation Oscillation, through the electromagnetic relay controlled by the single-chip switching LC series resonant circuit inductance and capacitance of the center frequency in the audio frequency band to achieve any regulation.It has been proved that the device circuit structure is simple, easy to use, adaptable, can effectively inhibit each Self-excited oscillation caused by acoustic feedback