1) low frequency line spectrum
低频线谱
1.
Based on physical mechanism of low frequency line spectrum on propeller cavitation noise,the acoustic radiations of a great of cavitation bublles are represented by a single cavitation bublle during propeller cavitation absolutely.
依据螺旋桨空化噪声的低频线谱产生机理,在各叶片充分空化情况下,大量气泡的平均行为可用单空泡来仿真,桨叶旋转而引起的大量气泡的脉动压力波形可近似描述为由一系列具有单空泡脉动声压场波形,以叶片频倒数为准周期间隔,幅度为随机变量的脉冲所组成。
2) low-frequency spectrum
低频光谱
3) multiple line spectra
多频线谱
1.
A novel approach to suppress the vibration with multiple line spectra is presented.
针对多频线谱振动提出一种新的主动控制方法———多通道解耦LMS自适应滤波方法。
4) Spectrum curve
频谱曲线
1.
The map of scanning spectrum curve occupies a big storage space.
针对工程频谱曲线扫描后存贮空间大的问题，本文提出了扫描曲线分形插值点的自动识别方法，应用基于几何原理的分段分形插值模型自动求解压缩因子，使得工程频谱曲线的分形重构满足了工程要求。
5) line spectrum frequency
线谱频率
1.
To reduce the computational complexity and storage of the line spectrum frequency(LSF) parameters quantizer a predictive multi-stage split vector quantizer is designed to quantize LSF parameters by using the correlation of LSF parameters between frames and inter frames.
为了降低线谱频率(LSF)参数矢量量化器的搜索复杂度和码字存储单元,利用LSF参数的帧内和帧间相关性,设计了一种LSF参数的预测式多级分裂矢量量化器。
6) frequency-width
频谱线宽
1.
Based on the approximate descriptions between the frequency-width Δν and coherent τc time about light source time-coherence by using Newton iterative method, the more precise relations is derived between them.
针对光源时间相干性中频谱线宽Δν与相干时间τc的关系(Δν≈τc)的粗略表达,运用牛顿迭代法对两者的关系进行了较精确的推导,并对其误差及范围进行了讨论。
补充资料：低频
1.指应用于某一技术领域中的最低频率范围。例如，无线电波段中，将30～300千赫范围内的频率称低频;电子放大电路中，将接近音频(20赫兹～2万赫兹)的频率称为低频。
说明：补充资料仅用于学习参考，请勿用于其它任何用途。
参考词条