假定两个扬声器都发射恒定频率的纯正弦声波。
Suppose the speakers both emit a pure sinusoidal sound wave of constant frequency.
TB寄存器会以一种依赖于实现的频率周期性地增加，这个频率可能不是恒定的。
The TB register is incremented periodically with an implementation-dependent frequency, which may not be constant.
因此它可以把“两倍于电源频率的直流电”进行“平滑化处理”，成为一个接近恒定的直流电。
Therefore it can be seen that it will "smooth" the "twice mains frequency DC" into a near constant DC voltage.
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