threshold frequency

Experiments and Model Calculation of Soft Threshold for the Frequency Shifted Feedback Nd ∶ YLF Laser

频移反馈Nd∶YLF激光软阈值实验与模拟计算

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In addition, speech hearing threshold and high frequency hearing threshold increased with the length of exposure to both heat and noise environment ( P < 0.01).

语频听阈和高频听阈随高温噪声暴露时间的延长而增高（P

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Mixed coding method of remote sensing image based on wavelet package decomposing is that threshold of low frequency and high frequency coefficients decomposed by wavelet package is classified into important and unimportant coefficients.

基于小波包分解的遥感图像混合编码方法，首先将小波包分解后的低频和高频小波系数域值化为重要系数和非重要系数。

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So, for example, we were talking about a threshold frequency as in a minimum frequency of light that you need in order to eject an electron from a metal surface.

举个例子来说，我们谈论的临界频率是，光从金属表面逐出一个电子，所需的最小频率。

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The audiometric zero level has been measured in the frequency range 2-100 Hz, with particular attention to frequencies below 25 Hz. A Direct Determination for Hearing Threshold of Bone Conduction by Using Impedance Head

本文对低频段的听力零级进行了测量，得到了两个不同测试组在2Hz&100Hz频率段的阈值曲线。纯音骨导听力零级的测定

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Using the adaptive threshold filtering algorithm and frequency domain LMS filtering algorithm to suppress the narrowband interference and found some disadvantage with it.

详细研究了自适应阀值滤波算法及频域LMS滤波算法，对将其应用于导航接收机的干扰抑制的性能及缺陷做了详细分析。

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The relations between the photolysis frequency and the dissociation threshold and between the bottleneck effect and the molecular structure have been discussed.

对瓶颈效应与分子结构之间的关系及解离阈值与激发频率之间的关系也作了简单的讨论。

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The new methods can rapidly and efficiently obtain the informations of a real sinusoidal signal's phase on time domain or frequency domain by zero-crossings or FFT transforming. The modified methods can extend the threshold SNR of frequency estimation, and it is easily implemented.

新的修改算法利用零交越或FFT变换，能快速有效地在时域或频域上得到实正弦信号的相位信息，改善了频率估计的SNR阈值，且便于工程实现。

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Effects of Military Noise on the Average Hearing Threshold of the Speech Frequency and High Frequency in the Elders

军事噪声对老年人言语频率及高频听力的影响

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Different alarm forms are used according to different frequency threshold value to reflect the emergency degree.

针对各频率运行限值采用了不同模式的报警,以反映紧急程度.

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The theoretical models are given on the basis of gain threshold and lasing frequency by virture of double mirror-cavity model.

采用等效双镜腔模型，从增益阈值和振荡频率方面给出了理论模型。

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Segmentation of Ultrasonic Image Using Getting Optimal Threshold by Frequency field Analysis

用频域分析最佳阈值的方法进行超声医学图像分割

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The results show that, for the case of detuning, both the second threshold and the critical frequency are always increased with the increasing of the detuning parameter.

结果表明，在失谐情形下，第二阈值和临界自脉冲频率都随失谐参量的增大而增大。

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Objective: To characterize the audiometric results of 1/ 2 octave frequency pure-tone audiometry in tinnitus patients with normal threshold on octave pure-tone audiometry and determine its clinical significance.

目的：观察常规倍频程纯音测听听阈无异常的耳鸣患者的半倍频程频率测试结果并探讨其特征及临床意义。

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Results: 96% ( in 225 ears) were cured by stimulation. Audiometric tests showed that the air conduction threshold in speech frequency was increased 10~ 15dB from base. There was no one decreased.

结果：结果：刺激法修补，225例耳中96%愈合，纯音听力测试，显示语音频率气导阈，在原来的基础上提高10～15db，无一例听力下降者。

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Frequency domain filter algorithms include Threshold filter algorithm and Frequency block least mean square algorithm.

频域滤波算法有阈值滤波算法，频域块处理LMS滤波算法。

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The general expression of the threshold gain and frequency in the DFB lasers was deduced by using the coupled wave function.

利用耦合波方程，推导出分布反馈激光器自混合干涉频率及增益变化的表达式。

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Both speech hearing threshold and high frequency hearing threshold of the noise and heat group were obviously higher than those of the group with noise exposure only, and the difference was significant ( P < 0 01).

高温噪声组的语言听阈和高频听阈比噪声组明显增高，差异均有显著性（P

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Electrons are ejected from the object only when the frequency of the radiation is greater than a certain minimum value, called the threshold frequency.

仅当辐射频率大于某一最小值即极限频率时，物体才会发射出电子。

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The green light with a power of 11.3 mW and an efficiency of 2.3% was obtained. Laser threshold for self frequency doubling operation is measured to be 1 mW.

获得113mW的自倍频绿光输出，光光转换效率为23%，自倍频腔阈值为1mW。

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First, the image is divided into two parts, high and low frequency, then we get the VQ codebook by means of comparing the threshold in high frequency and extracting representative codewords at different regions in low frequency part.

该算法将图像分割为高频、低频两部分，在高频段采用阈值比较的方法，在低频段采用分块提取的方法生成VQ码书。

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The results show that if audition threshold curve corresponding frequency dot is above 15~ 20dB, the infrasound affects many humans' physiology functions.

结果表明，在次声听阈曲线上各对应频率点为15～20dB以上时，次声对人体的多项生理指标产生了影响。

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An improved image enhancement algorithm by contour threshold nonlinear extrapolation in frequency space was proposed.

对非线性外推图像增强算法进行分析，充分考虑图像高频分量的局部特征，提出一种新的非线性滤波剪切策略包络阈值剪切算法。

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When the peak Stokes fluence exceed the damage threshold of frequency conversion crystals, the fatal damage on the crystals are the most serious.

TSRS效应不仅会造成泵浦光能量严重损失，使倍频效率大大降低，更严重的是，当TSRS产生的斯托克斯光的峰值能量密度大于频率转换晶体的破坏阈值时，将会造成频率转换晶体永久性破坏。

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The Dual Threshold Frequency Control of Digital Control Device

数控装置的双门槛频率控制

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The de-noising process of the method was ( described). The effects of the size of correlation region, the hard and soft threshold, the frequency and S/ N of original signal, were discussed.

系统的描述了该方法的滤噪过程，讨论了相关运算区域大小、软硬阈值法、信号的频率、信噪比对滤噪结果的影响。

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Evaluation of Hearing Threshold of Lower Frequency in Deaf-mute Children With 40 Hz AERP and Its Influence on Sleeping

40Hz听觉相关电位评价聋哑儿童低频听阈及睡眠对其影响的探讨

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Influence of masking noise on hearing threshold and frequency discrimination in guinea pigs

掩蔽声对豚鼠听阈和频率辨别阈的影响

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The article introduces a kind of dual threshold frequency control circuit for digital control device.

文章介绍了一种数控装置的双门槛频率控制电路。

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Bone conduction threshold shift at speech frequency was associated with the ages.

语频骨导听力损失程度随着患者年龄的增加而逐渐加重。

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