基于自适应增量调制的语音延时电路设计  

Design of Voice Delay IC Based on Adaptive Delta Modulation

作　　者：陈峰[1] 陈嘉鹏[1] 苏郁秋[1] 

机构地区：[1]中国电子科技集团公司第58研究所,江苏无锡214035

出　　处：《电子与封装》2012年第8期16-18,29,共4页Electronics & Packaging

摘　　要：传统的脉冲编码调制需要较长的码,其实现结构复杂。文中介绍了增量调制(DM)的原理,说明了它的优缺点,引入了对它改进后的调制方式——自适应增量调制(ADM)。自适应增量调制不仅集成了DM调制实现结构简单的特点,而且大大降低了DM调制中的量化噪声和斜率过载噪声,性能更为优良。根据ADM的原理,设计了采用自适应增量调制原理的语音延时电路,通过流片验证了其优异的性能,实测延时后的噪声电压为-88dBV,总谐波噪声+失真<0.5%。The traditional pulse code modulation needs a longer code, so its structure is complex. The principle of Delta Modulation was discussed in this paper, we analyzed the advantage of the Delta Modulation, then induced an improved Modulation, Adaptive Delta Modulation. ADM is not only very simple, but also depress the Slope Overload and Granular Noise deeply. An integrated circuit based on ADM was designed, and is much better than DM. Noise voltage is -88dBV, the total harmonic noise plus distortion is less than 0.5%.

关 键 词：自适应增量调制 延时 预测 

分 类 号：TN402[电子电信—微电子学与固体电子学]