一、前言增量调制系统是1952年F、deJagar提出来的。由于它只考虑信号的增量,因此编译码器很简单。另外,△M是以单路进行编译码的,因此分路方便,对中、小容量的系统既简单又经济。当用低速率取样时,它比同样速率的PCM有更好的话音质量。△M还能忍受较大的误码,即对信道要求较低,在混合压扩增量调制中,当误码率达到10~(-1)时,话音仍能听懂。△M也适用于移动通信。 First, the foreword Incremental modulation system is 1952 F, deJagar put forward. Because it only considers the signal increment, so the codec is very simple. In addition, △ M is a single way to compile and decode, so easy to split, right, small capacity of the system is simple and economical. When sampled at low rates, it has better voice quality than PCM at the same rate. △ M can tolerate a larger error, that is, less demanding on the channel, in the mixed companding delta modulation, when the bit error rate of 10 ~ (-1), the voice can still understand. △ M is also suitable for mobile communications.