Abstract: Timbre and flexibility are two significant indexes of synthesis，in order to combine both of their features，based on methods of FM synthesis and sampling intervals synthesis，to realize a new method of digital-synthesis by time-domain waveform envelope processing and frequency-domain modulation to a key period waveform taking from guitar.The results of synthesis can sound better performance，also have a certain flexibility in design and application.It is achieved the designing in computer via MATLAB，provides a reference to the designing of digital synthesizer for portable and small equipment.

摘要： 音色与灵活性是音乐合成器的两个重要指标；为结合两者特点，根据数字FM合成法和采样回放合成法，以吉他为例对关键周期波形的时域包络处理和频域调制实现了一种新的数字音乐合成方法。实验表明：合成效果能较好表现音色，并有一定的设计灵活性。通过MATLAB在计算机上实现设计，为便携式、小型化数字音乐合成设备的设计提供了参考。