求翻译：针对数字选频电平表的具体应用，本文提出了基于相关检测的数字窄带滤波器的设计方法，分析了相关函数的运算误差，提出了基于FFT的相关函数计算方法，并在定点DSP上进行了编程实现。理论分析和实验结果表明，基于相关检测的数字窄带滤波器简单高效，选频电平表可在被测信号频率范围为200HZ ~ 2000KHZ宽频段范围内实现中心频率可调的窄带滤波，可广泛应用于数字信号处理领域中需要窄带滤波的场合中。是什么意思？

Digital frequency selection for the specific application level meter, paper, based on the number of narrow-band correlation detection filter design methods, analysis of the correlation function of the operational error, the proposed FFT-based correlation function is calculated, and on the fixed-poin

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Chose the frequency decibel meter in view of the numeral the concrete application, this article to propose based on the correlation detection numeral narrow band pass filter design method, has analyzed the correlation function arithmetic error, proposed based on the FFT correlation function computat

Specific applications for digital selective level meter, the paper presents the digital narrow-band filter design based on correlation detection method, analysis of the related functions of arithmetic error, made a calculation method based on FFT related functions, and conducted on a fixed-point DSP

Specific applications for digital selective level meter, the paper presents the digital narrow-band filter design based on correlation detection method, analysis of the related functions of arithmetic error, made a calculation method based on FFT related functions, and conducted on a fixed-point DSP