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为什么打电话会有回声?

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为什么打电话会有回声?

打电话时,你对着话筒说的话变成电波传输chu去了。从电话线上传chu去的信号,有一bu分又反馈回来,反馈回来的声音比原先的声音延迟一了点点时间,形成了电话中的回声现象。打市内电话时,由于距离很近,而电波传播的速度很快,反馈回来的声音延迟的时间很短,人们gan觉不chu回声现象。打国际长途电话就不同了,因为电话线长,有些还通过同步通信卫星的传递,反馈的声音就很明显,打电话的双方就会受到回声的干扰。为了消除这zhong现象,专家们研制了回声抑制qi,它是一个衰减qi,把送回来的回声衰减变弱,达到抑制回声的作用。更先进的回声抵消qi,是gen据正负信号相互抵消的原理来设计的,可以使回声信号化为乌有。

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