摘要
Σ－ΔＡ／Ｄ转换技术近年来颇受重视，因为基于该技术的Ａ／Ｄ转换器能达到很高的分辨率（１６ｂｉｔ以上），并另具一系列优点。本文对Σ－ΔＡ／Ｄ转换器的基本原理，包括过采样（Ｏｖｅｒｓａｍｐｌｉｎｇ），噪声成形（ＮｏｉｓｅＳｈａｐｉｎｇ），以及数字抽取滤波（ＤｉｇｉｔａｌＤｅｃｉｍａｔｉｏｎＦｉｌｔｅｒｉｎｇ）等内容，均作了叙述。作者还对一个２０ｂｉｔΣ－Δ转换器的算法进行了计算机仿真。该转换器采用了高阶ＭＡＳＨ噪声成形技术，而其数字抽取滤波部分则由梳状滤波器与级联的半带滤波器构成。文章中给出了仿真结果。
Attension of Sigma Delta A/D conversion technique has been paid in recent years,since A/D converter based on this technique can obtain very high resolution (over 16 bits )with a series of advantages.Basic principles of Σ Δ A/D converter,including oversampling,noise shaping and digital decimation filtering are discussed in this paper.Algorithm of 20 bit converter are simulated by computer.The converter uses a high order MASH noise shaping technique and a digital decimation filtering part consisting of comb filters and cascade of half band filters.The simulation results are given. [
出处
《电声技术》
北大核心
1997年第11期2-7,共6页
Audio Engineering
