Trumpeters alter fundamental frequency by modifying the lip tension and by pressing the valves to change the effective length of the tubes.

小号手可以藉由改变双唇的张力来增减基频，按下与放开活门则可以改变有效管长。

The chords the students liked best have frequencies with that harmonic relationship, too - all the frequencies are integer multiples of a common fundamental frequency.

大学生们喜爱的和弦也都有着最好的谐振关系——所有的谐振频率都是一个常见基频的整数倍数。

The numerical results indicate that the higher-order mass matrices have a negligible influence on the fundamental frequency, but they affect the frequencies of higher mode vibrations considerably.

数值实验结果表明：高阶质量矩阵对横向振动基频及低频的影响可忽略不计，但它们对高阶横向振动频率有很大的影响。

The component having the lowest frequency in a complex vibration (fundamental frequency or first harmonic).

复杂振动中频率最低的成分（基频或一次谐波）。

Based on the dynamic balancing of rigid rotors, an integral digital tracking filter method is put forward for fundamental frequency detection.

以刚性转子现场动平衡为背景，提出了用于基频检测的积分型数字跟踪滤波法。

It is shown that the offset of propulsion force and the lower natural fundamental frequency are caused by asymmetry of turbopump and weakness of connection stiffness between propulsion and frame.

研究表明，涡轮泵不对称以及发动机与机架之间连接刚度弱是引起推力偏心和基频固有频率偏低的主要原因。

Refraction correction carrier phase measurements is composition of two different sets of fundamental frequency wide-lane carrier phase measurement.

折射校正载波相位测量是由两组不同的基本频率宽巷载波相位测量组成。

It is verified experimentally that convergent resonance tube is better than uniform section type on suppressing fundamental frequency energy drift.

从实验上验证了把等截面谐振管变为变截面谐振管有助于对基频能量漂移的抑制。

The system has picked up unbalanced (fundamental frequency) signal amplitude and phase accurately by adopting the fourth order band-pass following filter controlled by phase-lock loop and FFT.

系统设计中采用锁相环控制的四阶带通跟踪滤波、FFT实现了不平衡（基频）信号幅值和相位的精确提取。

The filter has no fundamental frequency decay and phase delay, and all harmonics above2nd order are filtered.

该滤波器在基频处的幅值无衰减，相位无延时，能将2次以上的谐波全部滤掉。

An adaptive line enhancer based on the above notch filter extracts the fundamental frequency signal from noisy data.

采用自适应谱线增强器从含有噪声的数据中提取出基频信号。

There was always fundamental frequency component in the SABEP to two component complex tones, whether the difference frequency is equal to the fundamental or twice the fundamental.

对双组分谐波复合音，无论其间差频等于基频或基频的两倍，其诱发反应频谱中均出现基频成分。

Finally, the fundamental frequency estimation under different PQ disturbances condition, such as harmonics, voltage fluctuations, etc, is analyzed by simulation respectively.

并运用大量仿真，对本方法在谐波、电压波动等干扰环境下基本频率估计的有效性进行验证。

The average magnitude of this conversion function in frequency domain represents GVE, and the variation of the magnitude in fundamental frequency is identical to AC/DC value.

频域平均声门发声效率反映了物理定义上的声门发声效率的变化，而声门基频发声效率的变化与AC／DC比值变化一致。

The results shows that the fundamental frequency of the model which takes the combined activate into consideration reduced evidently, and the fundamental period prolonged evidently.

研究结果表明，考虑地基土、砂砾石垫层、上部结构共同作用时，结构的基本频率明显减小，相应的基本周期明显延长；

Experimentally the spectrum of the sound field radiated by the cracked plate on collision is measured and the fundamental frequency is determined.

实验上用小球撞击法测定了裂纹圆板的辐射声场频谱，并得出了谱的基频。

Objective To study the vocal parameters, including fundamental frequency, base, vocal range, jitter, in patients with hypertrophic plica vertricularis.

目的探讨室带肥厚患者的嗓音参数，包括频率微扰百分值、基频等，分析室带是否参与发音。

Influence of factors on fundamental frequency such as tapering coefficient, counterweight on tower top and elastic support were discussed.

分析了附加质量、变截面系数和弹性约束等因素对结构基频的影响。

The relationship between the fundamental frequency discount and the relative stiffness ratio was obtained by data fitting.

根据试验结果得到钢框架模型基频折减率和上部结构与地基相对刚度比的关系式。

This paper analyzes the condition in which HVDC system reaches the limit of power transmission with fundamental frequency quantities.

利用一种常用的简化HVDC输电系统模型，基于基频的系统变量分析了直流系统功率传送达到极限的条件。

Finally, the fundamental frequency estimation under different PQ disturbances condition, such as harmonics, voltage.

提出了一种电能质量干扰环境下的电力系统基本频率估计方法。

Results show the cable wind-proof wire may greatly meliorate integral structural rigidity and improves the self-vibration fundamental frequency and the effect is quite obvious.

结果表明，设置缆风索能大幅提升结构整体刚度，从而使结构自振基频得到提高，且效果明显。

The experimental items include the fundamental frequency (Fo), the rimal duration, the amplitude and the formants.

声学实验项目包括基本频率、音长、音强和共振峰。

For the first time, it is proposed that the of nonlinear damping force of ER fluid is made up of fundamental frequency and higher harmonics which are odd times of fundamental frequency.

提出电流变流体的非线性阻尼力的频谱是由基频和频率为基频奇数倍的高次谐波分量组成。

Characteristic curves of the fundamental frequency varying with the central amplitude are presented for some given values of the temperature rise.

在给定不同温度载荷参数时，获得了对称正交铺设复合材料矩形层合板的基频与中心无量纲振幅之间的特征关系曲线。