主题：咨询各位电信牛人，关于一个调制方式的问题。 -- 冻雨

Modules D600 series are digital speech modules and designed to provide high level protection of radio communication from eavesdropping. D600 module is a perfect cost effective solution for high-end voice encryption for commercial users, police departments, public safety organizations and other systems as a defense against unauthorized interception of private and sensitive voice transmissions by casual or even the most determined listeners.

Modules D600 series are no compatiblle with other digital modules

这个产品的应用在模拟无线信道上，就是普通的对讲机信道，25KHZ,FM调制方式，调制在语音上，产生类似白噪声的效果，普通用户FM解调出来的结果，就是白噪声，只有解密设备解调出来的结果，才是正常信号。