Yu Fang-Ming, Lee Kun-Cheng, Jwo Ko-Wen, Chang Rong-Seng, Lin Jun-Yi
Department of Electrical Engineering/Information and Communication Engineering, St. John's University, New Taipei City 25135, Taiwan.
Department of Optics and Photonics, National Central University, Taoyuan City 32001, Taiwan.
Sensors (Basel). 2021 Feb 2;21(3):1008. doi: 10.3390/s21031008.
In order to reduce Gaussian noise, this paper proposes a method via taking the average of the upper and lower envelopes generated by capturing the high and low peaks of the input signal. The designed fast response filter has no cut-off frequency, so the high order harmonics of the actual signal remain unchanged. Therefore, it can immediately respond to the changes of input signal and retain the integrity of the actual signal. In addition, it has only a small phase delay. The slew rate, phase delay and frequency response can be confirmed from the simulation results of Multisim 13.0. The filter outlined in this article can retain the high order harmonics of the original signal, achieving a slew rate of 6.34 V/μs and an almost zero phase difference. When using our filter to physically test the input signal with a noise level of 3 Vp-p Gaussian noise, a reduced noise signal of 120 mVp-p is obtained. The noise can be suppressed by up to 4% of the raw signal.
为了降低高斯噪声，本文提出了一种方法，即通过对捕获输入信号的高、低峰值所生成的上、下包络线取平均值来实现。所设计的快速响应滤波器没有截止频率，因此实际信号的高阶谐波保持不变。所以，它能够立即响应输入信号的变化并保留实际信号的完整性。此外，它只有很小的相位延迟。转换速率、相位延迟和频率响应可以从Multisim 13.0的仿真结果中得到确认。本文所述的滤波器能够保留原始信号的高阶谐波，实现了6.34 V/μs的转换速率和几乎为零的相位差。当使用我们的滤波器对噪声水平为3 Vp-p高斯噪声的输入信号进行物理测试时，得到了120 mVp-p的降低噪声信号。噪声可以被抑制到原始信号的4%。
