自适应滤波器在提高持续正弦信号采样精度中的应用

The application research on improvement of constant sinusoidal signal sampling precision based on adaptive filter

针对如何提高ADC转换精度问题,提出自适应正弦滤波方法。对于已知频率信息的信号的测量,按照最小均方误差准则自动调节自适应正弦滤波器的系数,以使滤波器的输出信号与所需测量的信号达到最佳逼近,根据自适应算法收敛结果即可精确得到所测信号幅值和相位。并用MATLAB验证了该方法的有效性,结果证明自适应滤波方法改善了ADC精度和信噪比,相当于提高了ADC的转换位数。

A novel scheme is present to improve the conversion accuracy of ADC.The proposed approach uses adaptive sinusoidal filter.For the measurement of the signal with given frequency,the automatic adjustment of filter coefficients is based on least mean-square error rule,which is a mathematical tool can be employed to make filter output signal achieve the best approximation to the needed one.Then based on the result,it is able to get the amplitude and phase of the measured signal accurately.MATLAB software is used to verify the effectiveness of the algorithm.It proves that adaptive filter has improved the accuracy and signal-to-noise ratio of ADC,which is equal to increase the conversion digits.