大多数的现代的调制技术都运用了非恒包络调制方式，并且峰值和平均值相差较大。
Most of the modern modulation techniques are jin use of a non-constant envelope modulation, which has a large difference between peak and average.
利用升余弦包络调制信号的特点，即基带信号为升余弦波，接收端可以利用这一包络，从中提取定时信息。
A method by using 8031 single-clip microprocessor to get the syntonical bit information is presented, based on the characteristic of the modulated singal in ascending cosine envelope.
而且相位连续的恒定及准恒定包络调制技术，具有很高的带宽和功率利用率，带外辐射较小，因而产生的邻道干扰也较小。
Furthermore, when the phase is continuous, they could provide high power and bandwidth efficiency. Due to the low out-of-band radiation, the interfere between channels is also small.
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