FFT is a mathematical tool commonly used in digital signal processing, and is characterized by fast operational speed and low SNR threshold value.
快速傅里叶变换是数字信号处理的常用数学工具，以运算速度快和信噪比阈值低为特点。
The iterative method of frequency estimation based on multi-channels, with high estimation precision, low SNR threshold, is easy to implement with hardware.
多通道迭代的测频算法，具有测频精度高，测频信噪比门限低，具有易于硬件实现的特点。
It is emphasized that under some poor SNR conditions, the "threshold effect" of non-coherent demodulator degrades seriously, even causes the receiver to be out of work.
本文特别指出，在小信噪比输入的条件下，非相干解调器的“门限效应”严重恶化，甚至使收信机无法工作。
The result indicates that it increases the SNR, de-noising effect is better than the threshold de-noising only.
实验结果表明该方法提高了信噪比，去噪效果优于单独应用阈值降噪的方法。
Aimed at the ultrasonic signal polluted by noises, which is low in SNR, a method of the ultrasonic signal denoising in wavelet domain based on an improved threshold function was put forward.
针对超声无损检测中超声信号受噪声污染、信噪比不高的情况，提出了一种新的基于改进阈值函数的小波域超声信号去噪方法。
This paper introduces a typical detecting circuit and discusses how to determine the SNR and the threshold of discrimination range when the laser pulse signals in the white noise are detected.
本文介绍一种典型探测电路，并论述了在白噪声中探测脉冲信号时如何确定信噪比和鉴幅阈值。
The experimental results showed that compared with other common wavelet threshold desnoising methods, the presented method can improve the visual effect and increase SNR of the denoised image.
实验结果表明，与普通小波阈值去噪方法相比，该算法能获得较好的图像效果，提高信噪比。
In theory of estimation with wavelet thresholding, the threshold adapting data can be calculated by minimum estimation of risk to improve the SNR of estimation.
提出了基于多窗谱法和小波阈值法对带噪语音的短时功率谱进行估计的语音增强改进方法。
It is demonstrated that ML estimating error can converge to CRB quickly with increasing synthetic aperture length and Signal to Noise Ratio (SNR), but a threshold effect exists.
研究表明，随着合成孔径长度和信噪比的增加，ML估计误差可以很快地收敛于CRB，但存在阈值效应。
To compensate for the deficiencies of traditional threshold functions and obtain the heart sound with high SNR for better analysis, a novel threshold function was proposed in this study.
为了弥补传统阈值函数在消噪过程中存在的不足，得到高信噪比的心音信号更好地进行心音分析，本文提出一种新的阈值函数。
This algorithm can choose the optimal packet type for data transmission according to average received SNR, and the threshold values for switching packet type were given.
该算法能够根据接收信噪比的不同情况选择最佳的分组类型进行传输，给出了进行分组类型切换的信噪比门限值。
This algorithm can choose the optimal packet type for data transmission according to average received SNR, and the threshold values for switching packet type were given.
该算法能够根据接收信噪比的不同情况选择最佳的分组类型进行传输，给出了进行分组类型切换的信噪比门限值。
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