本文简单地讨论了调制解调器的单音检测电路的原理，分析了相应的滤波器设计方法，并给出了具体计算结果。
The principle of the tone detection circuit is also studied and a method of designing the filter is given. At last, the coefficient corresponding to the filter is calculated.
本文简单地讨论了调制解调器的单音检测电路的原理，分析了相应的滤波器设计方法，并给出了具体计算结果。
The principle of the tone detection circuit is also studied and a method of designing the filter is given. At last, the coefficient corresponding to the filter is calculated.
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