【摘要】 光栅地震检波器是依据莫尔条纹技术设计的新型数字检波器,鉴于目前光栅数字地震检波器的输出信号中,杂质噪声对系统的干扰很大,不易将地震波信号与噪声区别开来,对于输出信号的噪声处理仍然是个难点,本文基于CPLD和傅立叶变换方法进行噪声处理。本文利用逻辑功能强大的可编程逻辑器件EPM7128 SLC84,将滤波、细分、辨向、计数锁存和接口功能集于一身,使用方便灵活。并通过EPP并口建立CPLD与PC机之间的通信。最后用MATLAB编程实现滤波去噪功能。更多还原

【Abstract】 The digital geophone is developed based on moiré technique, given the current grating digital seismic geophone in the output signal, there were a lot of impurities noise, it will be difficult to distinguish the seismic signal and the noise, for the noise output signal processing is still a difficult problem, the paper is processing the signal of noise based on the CPLD and the transform method of Fourier. This paper uses the powerful logic of the programmable logic devices including the filter function, the direction distinguishing function、the subdivided function、count latches and port function together. It is convenient and flexibe. And it finished communication between the CPLD and PC with parallel port EPP. Finally, it uses MATLAB programming to drive the filtering function.更多还原