The architecture of FM quadrature demodulation was provided. On the universal IF digitalization hardware platform, FM waveform was demodulated in base-band together with SSB and FM.
给出了FM正交解调结构，即在统一的中频数字化硬件平台上，与单边带、调幅等波形一起在基带完成正交解调。
Model DL-850 FM Three-Band Wireless earphone, It has functions to receive both AF and FM signals and can be used to accept hearing training instead of wire earphone in phonetic room.
DL- 850型调频三波段无线耳机不仅具有音频感应接收功能，还具有接收调频信号功能，该型号无线耳机还可以代替语音室有线耳机进行听力训练。
Model DL-850 FM Three-Band Wireless earphone, It has functions to receive both AF and FM signals and can be used to accept hearing training instead of wire earphone in phonetic room.
DL- 850型调频三波段无线耳机不仅具有音频感应接收功能，还具有接收调频信号功能，该型号无线耳机还可以代替语音室有线耳机进行听力训练。
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