这是由于音频信号传输途径上存在干扰。
音频信号,特别是前级信号是很微弱的,如果信号传输通道屏蔽不良,就会受到外界的干扰。发动机一旦运行,其发电机就会产生较强的电磁干扰,造成扬声器出现吱吱声。解决的办法:将音响电路置于金属壳体内并把外壳接地;音响电路的前级信号传输采用双线带外屏蔽(金属网状)层的信号线,屏蔽线一端(一般在后端)接电路地;音响线路板电路地与机壳连接。这样便可以消除吱吱声。
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