We made an improvement in overcoming the defects in speech signal adaptive delta modulation (abbr.ADM),such as slope overloading and grain noise. In this method,numerical sliding average filtering was used for filtering decoding speech signal.

• 针对语音信号自适应增量调制 (ADM )方式中斜率过载和颗粒噪声等缺点 ；提出了一种改进方法 ；它利用滑动平均方法对解码后的信号进行数字滤波 .