二进制移频键控在数字通信中的解调

Demodulation of binary frequency shift keying in digital communication

在分析数字通信中二进制移频键控信号的产生及解调基础上,提出一种应用于特殊工作环境中的单频点鉴频解调二进制移频键控信号的方法。结合Motorola公司的窄带调频解调芯片MC3372,描述了在中 英文NAVTEX接收机研制开发中二进制移频键控信号鉴频解调的实际应用。使用鉴频方法解调,能简易、有效地解调二进制移频键控信号,可广泛应用于嵌入式数字通信系统,从而简化了系统设备,缩短研制开发周期。

Based on the analysis of generation and demodulation of binary frequency shift keying in digital communication, this paper introduces that using one set of frequency discrimination circuit to demodulate binary frequency shift keying signal in special working environments. This paper also describes a real working circuit of binary frequency shift keying frequency discrimination demodulation in Chinese/English NAVTEX receiver's manufacturing, using Motorola Narrowband FM IF IC MC3372. It can demodulate binary frequency shift keying signal simply and efficiently while using frequency discrimination demodulation. In this way, it can be widely used in digital communication system on chip in order to reduce devices in project designing and shorten manufacturing periods.