在本文中提出一个自适应增量调制器,它由数字输出中0到1和1到0的跃变次数来获得压扩信息。文中分析了压扩特性和信噪比。同时给出了一个实验室内制作的试验编码器的实验数据及特性。在每秒32千比的取样比特率下,对于输入变化30分贝的800赫信号,信噪比大于26分贝。它比类似的其它自适应增量调制编码器来得好。 In this paper, an adaptive delta modulator is proposed, which obtains the dilatation information by the number of transitions from 0 to 1 and from 1 to 0 in the digital output. Compression characteristics and signal-to-noise ratio are analyzed in this paper. At the same time, experimental data and characteristics of a test encoder made in laboratory are given. At a sampling rate of 32 kilobits per second, the signal-to-noise ratio is greater than 26 dB for an input of a change of 30 dB of an 800 Hz signal. It is better than similar other adaptive delta-modulation encoders.