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近年来增量调制在国内得到了比较广泛地应用。到目前为止用得比较多的主要有两种。一种是△∑调制,另一种是双积分增量调制。△∑调制的主要优点是过荷特性好,在整个频带范围内,过荷特性基本上是平直的,因此信噪比与信号频率无关。它的缺点是可能达到的信噪比较低,随着所用的低通滤波器的通带的加宽信噪比的下降比较快。可以低通滤波器的通带一般不宜选得太宽。
In recent years, delta modulation in the country has been more widely used. There are two main uses so far. One is delta sigma modulation, the other is double integral delta modulation. The main advantage of delta sigma modulation is that the overcharge characteristics are good and the overcharge characteristics are essentially flat over the entire frequency band, so the signal to noise ratio is independent of the signal frequency. Its disadvantage is that it is possible to achieve a low signal-to-noise ratio, which is faster with a lower passband of the low-pass filter used. The passband of the low pass filter should not be chosen too wide.