A twice modulation is designed:, CVSD was adopted to realize conversion between analog and digital voice signals, 2DPSK was used as the digital modulation mode.
设计出了二次调制系统：采用连续可变斜率增量调制（ CV SD）实现模拟话音信号与数字编码的转换，采用二进制相对相移键控（2 DPSK）作为数字调制方式。
The waveform generator is composed by DSP and quadrature digital upconverter (QDU). DSP is used as main controller to decide the modulation mode and output waveform of QDU.
波形产生器主要由dsp和数字上变频器构成，DS P作为主控制器设定数字上变频器的调制方式和输出波形。
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