帧格式可编程的PCM信号源设计

摘要

针对遥测PCM模拟源输出信号参数不可调的问题，提出了一种输出帧格式可编程的PCM信号源设计方法。该方法以FPGA作为逻辑控制中心，充分利用其内部资源灵活配置的特点，实现了一种码率连续可调、帧格式可编程的PCM信号源。实验测试结果表明：设计的信号源能够输出主帧1~1024、副帧1~256范围内帧格式可编程的PCM数据流，数据流可以选择正弦波、三角波、方波、锯齿波、随机数及固定值数据。%Aiming at the problem that the output signal parameters of the telemetry PCM(Pulse Code Modulation) analog source output signal is not adjustable,a PCM signal source has been proposed for the design of output frame format programmable. The method takes FPGA as the logical control center,makes full use of its internal resources and flexible configuration features,and achieves a continuously variable bit rate,frame format programmable PCM signal sources. Test results show that the design of signal source can output the main frame 1~1 024,deputy frame 1 to 256 within the scope of the frame format of programmable PCM data streams. Data flow can choose sine wave ,tri⁃angle wave,square wave,sawtooth wave,random number,and a fixed value data.