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    • 5. 发明授权
    • Microprocessor FSK data communications module
    • 微处理器FSK数据通信模块
    • US4689801A
    • 1987-08-25
    • US540220
    • 1983-10-11
    • Mark E. NurczykPatrick J. WilsonTony J. Wood
    • Mark E. NurczykPatrick J. WilsonTony J. Wood
    • H04L27/10H04B1/38
    • H04L27/10
    • A microprocessor-based frequency shift keying (FSK) data communications module. The microprocessor selectively modulates and demodulates data directly in terms of a square wave pulse train in which a first frequency is used to convey a binary "1" and a second frequency to convey a binary "0". An input and an output port on the microprocessor are selectively coupled to a transmission line through a transformer, by means of electronic switches. Also included are a bandpass filter for shaping the square waves into sine waves and for filtering noise, and means including a notch filter for generating a carrier detect signal input to the microprocessor, when incoming data is detected on the transmission line. Many of the components in the module are used for both transmitting and receiving data.
    • 一种基于微处理器的频移键控(FSK)数据通信模块。 微处理器根据方波脉冲序列直接选择性地调制和解调数据,其中第一频率用于传送二进制“1”和第二频率以传送二进制“0”。 微处理器上的输入和输出端口通过电子开关选择性地耦合到通过变压器的传输线。 还包括用于将方波整形为正弦波和滤波噪声的带通滤波器,以及当在传输线上检测到输入数据时,包括用于产生输入到微处理器的载波检测信号的陷波滤波器的装置。 模块中的许多组件用于发送和接收数据。