| 1. | Partial coherence function
部分相干函数 |
| 2. | Spatial coherence function
空间相干函数 |
| 3. | Initial growths of disturbances are measured by means of hot - wire anemometry . due to the detected signals with low signal to noise ratio , the coherence function is used to eliminate background noise during data reduction
在扰动增长的初始阶段，信号的信噪比非常地低，根据相关谱分析方法，应用相干函数，将扰动信号有效地提取出来，测量了初始扰动的增长。 |
| 4. | In analysis and transaction of signals , spectrum analyzer is a classical and important instrument which is mainly used to analyze the time domain wave , amplitude , spectrum domain wave , demodulating analysis , digital filtering , correlate analysis , transfer function and coherence function of signals
频谱分析仪是信号分析与处理中常用的仪器，它可对信号进行时域分析、幅值域分析、频域分析、解调分析、数字滤波、相关分析和传递相干分析。 |
| 5. | The basic concepts of second - order coherence theory in describing wavefields are introduced . these concepts are the cross - spectral density function and spectral degree of coherence in the space - frequency domain , and the mutual coherence function and the complex degree of coherence in the space - time domain
介绍了二阶相关理论中描述光场相干性质的基本概念，包括空间-时间域中的互相关函数、复相干度和空间-频率域中的交叉谱密度函数、光谱相干度。 |
| 6. | Further more , power spectrum density ( psd ) of each test section was analyzed , and its experiential formula was given . combined with experiential the formula of coherence function , the mathematic model for calculating the caarc standard tall building ' s wind - induced response was set up
进一步拟合了顺风向和横风向各测点层层风力谱的经验公式，并给出了以此为基础的计算caarc标模风振响应的流程，从而建立起完整的标模风振响应以及等效荷载计算的数学模型。 |
| 7. | In this paper , a simplified method of calculating wind - induced response and design loads of super - high - rise buildings was proposed . coherence properties of wind load on typical tall building were analyzed and the results show that cross - wind loads at different height have strong coherence at vertex shedding frequency , and the coherence function ' s value here is near to 1
首先分析了各测点层合力的相干特性，结果显示各测点层所受顺风向风荷载之间的相干函数基本成单调衰减规律，而横风向脉动风荷载在漩涡脱落频率处存在和顺风向不同的显著相关性。 |
| 8. | Under the condition of " comparatively weak correlation between the two noises involved , coherence function is used as a frequency domain amplification factor for improving snr of the output signal to the filter and the speech enhancement effect . meanwhile , a real - time recursive algorithm is put forward in substitute for current algorithms based on short time fourier transform . the new algorithm will simplify computations and will be suited for real - time implementation together with the adaptive systems
接着针对上述nanc系统两路输入信号噪声相关性弱的情况，用相干函数作频域增益因子来提高输出信噪比与改善语音增强效果，同时，通过一种实时迭代算法解决了短时傅氏变换计算量大的问题，简化了计算，便于实时处理与实际应用。 |
| 9. | The signal process function of the software include these function : digital filter , windowing , auto - correlation function and cross - correlation function , mean and variance , probability density function and probability distribution function statistic ; auto - power spectrum , cross - power spectrum , frequency response function , coherence function , cepstrum analysis based on fft ( fast fourier transfer ) ; joint time - frequency analysis based on stft ( short - time fourier transfer )
软件的处理功能包括：数字滤波、时域加窗、自相关与互相关处理、均值和方差计算、概率密度和概率分布函数计算；在快速傅立叶变换( fft )基础上计算自功率谱、互功率谱、频率响应函数、相干函数、倒频谱分析；基于短时傅立叶变换( stft )的联合时频分析等。 |
| 10. | So a new method is proposed that combines the traditional transfer function and coherence function analysis with the statistics of frequencies to obtain the dominant frequencies , which can reflect how the noise sources influence the bus interior noise level in frequency domain , and which will provide reliable references to make up plans in reducing the bus interior noise
对此提出了在传统的传递函数和相干函数分析的基础上结合频率统计，选出优势频率的方法来考察噪声源对车内噪声的影响，为制定客车车内噪声治理方案提供了可靠的依据。 |
