正弦和三角波信号识别与分离装置设计

Design of device to recognize and separate sinusoidal and triangular wave signals

为了解决信号传输和接收过程中多个信号混叠造成信号干扰和损失的问题,设计了一种信号分离装置。该装置主要由模拟信号源产生、信号调理、信号采集与数字处理和信号输出4大模块构成。在信号调理模块中,对基于MCP6002的加法器电路产生的待分离信号源进行直流偏置,将信号变换至STM32G473片内数模转换器(ADC)采集范围。在信号采集与数字处理模块中,采用ADC对调理后的信号进行连续采样,并使用快速傅里叶变换(FFT)对采集到的信号序列进行时频域变换,分析计算两原始信号的类型和频率参数。在信号输出模块,利用DDS模块AD9833输出两原始信号,最后在信号调理模块利用乘法、滤波和比较电路形成信号跟踪反馈,有效抑制漂移。本装置主要考察了两路正弦信号、三角和正弦信号以及两路三角信号的分离,测试结果表明,该装置能准确分离出两信号,且频率的平均精确度达到99%以上,并能稳定显示波形且不产生漂移,提升了信号分离的准确性和有效性。

In order to solve the problem of signal interference and loss caused by the overlapping of multiple signals in the process of signal transmission and reception,a signal separation device is designed in this paper.The device is mainly composed of four modules:analog signal source generation,signal conditioning,signal acquisition and digital processing and signal output.In the signal conditioning module,the signal source to be separated generated by the adder circuit based on MCP6002 is DC biased to transform the signal to the STM32G473 on-chip ADC acquisition range.In the signal acquisition and digital processing module,the ADC is used to continuously sample the conditioned signals,and the time-frequency domain transform is performed on the acquired signal sequence using the FFT to analyze and calculate the type and frequency parameters of the two original signals.In the signal output module,the DDS module AD9833 is used to output the two original signals,and finally the signal tracking feedback is formed in the signal conditioning module using multiplication,filtering and comparison circuits to effectively suppress drift.This device mainly examines the separation of two sinusoidal signals,triangular and sinusoidal signals and two triangular signals,and the test results show that the device can accurately separate the two signals,and the average accuracy of the frequency reaches more than 99%,and it can stably display the waveforms and does not generate drift,which improves the accuracy and effectiveness of signal separation.