When early faults accur , the background noise is heavy , it is difficult to extract the latent periodic components successfully using second order cyclostationary analysis alone 摘要由于噪声的严重干扰，在滚动轴承早期故障时，仅仅利用二阶循环平稳分析方法往往较难成功提取出信号中潜在的有用周期信息。
With nir spectra , the analytical information is contained in small spectral variations and usually dominated by the features such as light scattering , background noise and baseline drift 近红外光谱不但包含着物质成分信息，而且这些信息完全掩盖在众多复杂背景当中(包括光散射、背景噪声以及背景漂移) 。
The traditional speech detection techniques are not only limited in precision , but also mostly can be efficient only under undisturbed environment like the lab or if the background noise is very limited 传统的语音起点检测技术，不仅精确度有限，而且大多只适用于安静的实验室环境或是背景噪声较小的情况。
The system can help the hearing impaired to make the most of their hearing aids by cutting out unwanted background noises in the room and thus reducing the degrading effects of noise and echoes in the hearing aids 该系统能过滤环境杂音，从而减低听障人士助听器内出现的杂声，让他们可以接收到更清晰的话音内容。
In view of heavy task in the paper , it is worthy to research more in eliminating the background noise and choosing features for better underwater targets recognition and classification result in the future work 由于论文工作量较大，本文的水下目标识别分类方法中对去噪处理和特征参量选择的研究还需有待进一步的探索。
Environmental changes due to factors such as climate change are likely to be difficult to identify against the background noise arising from the numerous sources , both natural and man - made , of environmental variability 在众多自然及人为因素产生的环境变异源导致的噪音背景下，因气候变化等因素造成的环境变化很难确定。
In present study , we obtained large numbers of phasic discharge pattern neurons , which play important role in analysis and perception of sound signal from environment with background noise 实验中所记录到的大量phasic神经元在分析背景噪声中的声信号，以及声信号的识别方面可能扮演重要角色，因为听觉认知的最初阶段就是信号识别。
It is difficult to extract crack defects from a defect image by traditional detection techniques , for the image of surface crack defects on a medium plate is influenced greatly by background noise and oxidized scale 摘要中厚板表面裂纹缺陷在图像中容易受背景噪声和氧化铁皮的影响，传统的图像处理方法很难将裂纹缺陷从图像中检测出来。
Hvac - related noise is often the major source of background noise in many indoor spaces , so the buildings that have heating , ventilating , and air - conditioning system interior noise environment are the most important considerations 本文针对建筑内部声环境对人的影响进行了分析和评价方面的研究，主要考虑具有hvac系统的建筑物内部声环境。
Simulation results indicate that this algorithm possesses better pitch detection precision for the speech signals under strong background noise , low calculation complexity , high resolution , and capability for real time implementation 仿真结果表明，该算法在强背景噪声下仍可以准确提取基音周期，并且具有复杂度低、分辨率高和实时性好的特点。
