In this system, continuously variable slope delta modulation(CVSD) is used to change the analogy signal into digital, GFM is used to modulate the signal, FDMA, PLL frequency synthesizer.

• 这种系统采用连续可变斜率增量调制(CVSD)来实现语音信号的编码、GFM调制解调方式、FDMA、PLL频率合成器技术。