| 1. | Lastly , research on the application of wavelet transform in feature extraction is conducted and demonstrated its merit on fault diagnosis according to the experiments of real signals
最后研究了小波分析在频带能量特征提取中的实际应用，通过实例分析，说明其可以较好的诊断故障。 |
| 2. | Based on upper study deeply the efficient digital channelized architectures based dft polyphase filter banks to deduce and establish several kinds channelized digital receiver mathematic models for real signal
在此基础上深入研究了基于多相dft滤波器组的数字信道化高效结构,推导并建立了实信号信道化数字接收机的多种数学模型。 |
| 3. | The algorithm can quickly and accurately acquire the input signal , which is consistent with the real signal . the dissertation explains the algorithm to ascertain the cell working range and to choose characterization points
在分析深亚微米工艺下器件模型的基础上，文章推导了单元工作曲面范围的计算公式，给出了参数提取测试点的选择算法。 |
| 4. | A modified real signal model of channelized transmitter is presented that employs multiphase filters and discrete fourier transform to maximize computing efficiency , which can mean much in a radio communication system that requires real - time processing
特别提出了改进的实信号信道化发射机数学模型，通过利用多相滤波与离散傅立叶变换，减少信号处理运算量，这对于强调实时运行的无线通信系统有重要意义。 |
| 5. | Fourthly , research on the application of wavelet transform in signal noise reduction is conducted . the approach of noise reduction based on wavelet denoise and wavelet packet denoise is proposed . the results of experiments with simulation signals and real signals show that the approach can be applied to noise reduction effectively
第四、研究了小波分析在信号消噪方面的实际应用，分别对仿真信号、实际信号进行了小波消噪及小波包消噪，取得了较好的结果。 |
| 6. | It can separate the real signal from noise signal effectively and attains the purpose of de - noise by using time - frequency localizing anslysis , local feature abstract , time - change filter wave , restraining or attenuating some frequency range and other characters of wavelet . furthermore , the ratio of signal to noise has been improved greatly and it is not affected by signal state
而利用小波分析的时频局部化分析、局部特征提取和时变滤波、抑制或衰减某些频率区间等特点，能更有效地把真实信号和噪声信号区分开来，达到消除噪声的目的，并且这种方法恢复的信号，信噪比有明显的提高，还不受信号的状态的影响。 |
| 7. | This paper particularly compares the complexities of the three manners ? the base band complex signal manner 、 the intermediate frequency complex signal manner and the intermediate frequency real signal manner , in the rf circuit and the base band digital signal processing , respectively ; chooses the intermediate frequency complex signal output manner , which not only reduces the complexity of the digital signal processing , but also be compatible with the intermediate frequency real signal output manner in some applications which have strictly request on the consistency of the amplitude and the phase in i / q channels
然而在以往的文献中很少对此进行过全面的分析。论文详细比较了三种不同的信号输出方式? ?基带复信号、中频复信号和中频实信号在rf电路和后端数字信号处理复杂度上的区别;并为接收机选择了中频复信号输出方式,在降低数字信号处理复杂度的同时,还能在某些对i / q双通道幅相一致性要求严格的应用场合兼容中频实信号输出方式。 |
| 8. | Abstract : through transient spectrum analysis , we can obtain such parameters as transient central frequency , transient frequency width and transient principal frequency . these parameters indicate dynamic characteristics of real signals , benefit the study of dynamic characteristics of radar wave , and can prvide multiple parameters for integrated interpretation of the radar profile
文摘:通过瞬态谱分析，可以求得瞬时中心频率、瞬时频宽、瞬时主频等参数表征实信号动力学特征，有利于对雷达波动力学特征的研究，并可提供多参数对雷达剖面进行综合解释。 |
| 9. | Chapter two introduced the basic ideas of emd theories briefly , and then discussed the emd - based time - frequency analysis method ' s basic agrithom . the conclusion was deduced that the method is valid in the field of signals processing and fault diagnosis in rotating machinery by simulation and real signal analysis . chapter three discussed the origin of emd method ' s end effect , then studied the direct , time - series based and neuron network based data extention technologys to weaken the end effect
第二章介绍了基于emd时频分析方法的一些基本概念；阐述了emd方法和基于emd的希尔伯特变换的基本原理和算法；在此基础上，用基于emd的时频分析方法对仿真和实际信号进行了分析验证，结果表明把该方法引入旋转机械振动信号时频分析和故障诊断领域是有效的。 |
