本章叙述改进△调制方式的△∑调制方式的特点和工作原理。△调制方式不能转换直流,△∑调制方式可以转换直流。该调制不仅应用到通信领域,最近在数字音频领域也倍受关注。老式数字音频中,用高位A/D、D/A转换和高采样频率产生高精度,与此相反,△∑调制方式只用1位A/D、D/A转换。与老式高位A/D、D/A相比较有下述特点:1位A/D、D/A不需要 This chapter describes the characteristics and working principle of delta sigma modulation method to improve delta modulation method. △ modulation can not convert DC, △ Σ modulation can convert DC. The modulation is not only applied to the communication field, but also has drawn much attention recently in the field of digital audio. In old-fashioned digital audio, high-precision A / D, D / A conversion and high sampling frequency are used to produce high precision. In contrast, the ΔΣ modulation method uses only 1-bit A / D and D / A conversion. And the old high A / D, D / A compared to the following characteristics: 1 A / D, D / A Not required