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话筒拾音的音频系统中,都有反馈啸叫的可能。通过对多种啸叫抑制方法的比较,提出一种新型抗啸叫电路设计方案。系统包括音频放大器的设计和抗啸叫电路方案的设计。音频放大器的设计利用基于TI的功率放大器芯片TPA3112D1,并通过MCU实现输出功率可控。抗啸叫电路的设计选用MAX264构成陷波滤波器,以切除啸叫频率点信号达到啸叫抑制的目的,其中MAX264时钟频率由函数发生器ICL8038按扫频信号电路连接产生。利用音频系统作为啸叫测试平台,其结果表明采用陷波法设计的电路方案能够有效地实现啸叫点的检测与抑制,设计方案简单、实用且处理后的音质无明显畸变,能应用于多种场合。
Microphone pickup audio system, there is feedback whistling possible. Through the comparison of a variety of howling suppression methods, a novel anti-whistling circuit design is proposed. The system includes the design of the audio amplifier and the anti-whistling circuit scheme. The design of the audio amplifier utilizes the TPA3112D1 power amplifier chip based on TI, and can control the output power through MCU. Anti-howling circuit design selection MAX264 notch filter to remove the howling frequency signal to achieve the purpose of howling suppression, in which MAX264 clock frequency by the function generator ICL8038 generated by the sweep signal circuit. The results show that the circuit scheme designed by the notch method can effectively detect and suppress the howling point, the design scheme is simple, practical and the processed sound quality is no obvious distortion, can be applied to more Kind of occasion.