信号频带

数值分析结果表明，信号频带越宽，RAKE接收机抗衰落性能越理想，发射机所需发射的功率越小，也越有利于设备防爆性能的提高。

The numerical results indicate that the wider the signal bandwidth , the better the fading resisting performance of RAKE receiver becomes and the less the power needs to be transmitted , and more favor for the improvement of explode preventing capability of the equipment .

MP4音视频芯片中由于要处理的音视频信号频带很宽，而芯片中电压模式的放大器的频带受增益的限制，所以研究宽频带的电流反馈运算放大器具有实际意义。

MP4 audio / video chip processes wide bandwidth of audio / video signal , but in the chip the voltage pattern amplifier bandwidth is limited by the gain , therefore the research on the wideband current feedback operational amplifier has the practical significance .

小波包变换（WPT）建立在小波变换的基础上，可以实现信号频带的均匀划分，能够更好地提取信号的时频特性，具有更好的谐波分析特性。

Using wavelet package transform ( WPT ) constructed on the basis of wavelet transform , the frequency band of signals can be uniformly divided and the signal features in time domain and frequency domain can be better extracted , so WPT possesses better performance for harmonic analysis .

基于矢量量化的语音信号频带扩展

Bandwidth Expansion of Speech Based on Vector Quantization DIGITAL CODING OF SPEECH SIGNALES

最后，总结了单段爆破振动信号频带能量的分布特征。

Finally , the change law of energy distribution of single deck blast vibration signals is analyzed .

提出了基于信号频带能量和相同步作为脑电特征向量，实现对左右手运动意识任务的分类方法。

A method for single trial on-line classification of imaginary hand movements , based on band power and phase synchronization derived from EEG , is proposed .

理论和实验结果表明，随着通路间相位差的增加，声象随信号频带宽度的增加而展宽。

The theoretical and experimental results show that accompanying the increase of the interchannel phase difference , the sound image broadens as the signal frequency band width increases .

扩频通信的射频信号频带宽度，可扩展到信息信号频带宽度的数倍乃至数千倍。

The band width of the radio-frequency signal for the spread spectrum communication can be spreaded to several times or even thousands of times the band width of the information signal .

小波包变换能够实现信号频带的均匀划分，在任意频率聚焦，是分析暂态电能质量扰动时频特性的良好工具。

Wavelet package transform ( WPT ) can divide the signal frequency into uniform frequency sub bands , which make it a good tool for transient power quality disturbance detection and localization .

通过实验探索到了使系统检测性能达到最佳的噪声信号频带、传声器的安装位置、相关算法的积分点数。

Through the experiment , I explored noise signal frequency width , the microphone installment position , the correlation analysis and algorithm integral points which can enables the system examination performance to achieve the most superior .

∑&Δ调制器采用过采样和噪声整形技术，将信号频带内的噪声功率推至高频范围内，然后由降采样滤波器将高频噪声滤除，从而提高了信号频带内的信噪比。

Based on oversampling and noise shaping techniques , ∑ - △ modulator pushes most of the noise energy to high frequencies out of signal baseband , then , the noise energy is filtered by the subsequent decimation filter , thereby gaining high SNR .

现代电子战中需要处理的信号频带越来越宽，电磁干扰越来越大，传统的接收机已经无法满足在复杂背景环境中对目标信号进行监测的需求。

Nowadays with the signal frequency band to process in modern communication electronic warfare getting much wider , so as the electromagnetic interference getting much stronger , the traditional receiver can not satisfy the demand to monitor the target signal in complex background environment .

爆破振动信号不同频带的能量分布规律

Laws of energy distribution in different frequency bands for blast vibration signals

一是基于小波包分析的能量特征提取方法，有效的提取信号各频带内的能量特征。

The other way is power feature extraction on the basis of wavelet transformation .

图象信号的频带压缩

On Bandwidth Compression of picture Signals

传真信号的频带压缩

Band compression of facsimile signal

其次，分析射频识别系统基带信号与频带信号的特性，以及信道噪声与干扰的特点，指明信号的潜在影响因素。

Secondly , the characteristic of baseband signal and frequency band signal in RFID system are analyzed .

现行的广播电视系统由于采用隔行扫描方式，从而有效地压缩了电视信号的频带，有利于传输；

Employing the interlaced scanning , current TV system can compress the frequency band of TV signal effectively and facilitate transmission .

本论文选用小波时频分析方法，使处理后的地震信号有效频带展宽，从而达到提高地震资料分辨率的目的。

Using the time-frequency method of wavelet transform , the band-width of frequency broadens , so the seismic signal resolution can be increased .

本文讨论了船舶交通管理系统微波信息传输子系统中对雷达窄脉冲视频信号进行频带压缩处理的必要性和可能性。

The necessity and possibility of compressing radar narrow pulse video signal bandwidths in a microwave information transfer sub-system of VTMS is discussed in this article .

对于滩浅海高精度地震采集，应减少震源或接收水听器沉放深度，有利于展宽有效反射信号的频带宽度。

As to high-precision seismic acquisition , the depth of source or receiver should be reduced , which can broaden the width of efficient reflection signal .

最后，利用小波多频带技术，建立了内爆炸振动信号多频带小波预测模型，用来对振动信号进行预测。

Finally , with the use of wavelet multi-band technology , a model of the muti-bands wavelet coefficients to predict vibration signal under internal explosion loadings was set up .

当连续图像信号的频带处于一个圆形区域之内时，正六边形点阵结构的采样密度比矩形点阵结构的采样密度要降低13.4%。

However , when the signal is a circularly band-limited , the minimum sampling density for a hexagonal sampling lattice is 13.4 % less than that for a rectangular sampling lattice .

反之，若信号的频带宽度有限，当进行频域抽样时，时域必然发生混叠。

Contrarily , if the frequency bandwidth of signal is finite , the time length of signal will be infinite when sampling in frequency domain , the time folding phenomenon will certainly happen .

研究结果表明：爆破振动信号的频带能量分布与爆破条件密切相关，其主振频带较宽并可划分为多个子振频带；

The results show that energy distribution for different frequency bands has close relation to blast conditions , and blast vibration signal has wide dominant frequency band that can be divided into many sub-bands .

首先，基于声发射源定位技术原理，运用小波变换技术对波形信号进行频带分解获取了缺陷源的精确位置。

Firstly , the exact location of AE source is determined by using wavelet transform technique on the waveform signal to decompose its frequency band , which is based on AE source location technique .

进而，根据爆破地震信号不同频带的特征频率与受控建筑物自振频率之间的关系确定爆破地震对建筑物的影响。

Based on the relation between characteristic frequency of blasting seismic signals on different frequency bands and natural frequency of controlled structure , the influence of the blasting vibration on the structure could be assessed .

利用小波包频带能量分析法实现了对信号各频带相对能量信息特征的准确提取，为曲柄轴承磨损故障的识别提供了定量的依据。

With the energy analysis to wavelet packet frequency bands , the feature of relative energy of frequency bands can be extracted accurately , which provides the diagnosis of crank bearing wear fault with quantitative foundation .

由于光相干层析成像中测量的干涉信号空间频带有限，因此会产生散斑。传统光学理论认为，图像可分辨的最小宽度以编码环的环宽为极限。

Speckle arises as a natural consequence of the limited spatial frequency bandwidth of the interference signals measured in optical coherence tomography ( OCT ) . Traditionally , spatial resolution is limited by the width of ring .

由于这种噪声的频带与飞轮瞬时转速信号的频带可能重叠，因此采用传统的滤波等方法无法完全消除齿形误差引起的噪声。

As the frequency band of the noise is overlap with the frequency band of momentary flywheel speed , it is less efficient to eliminate the noise with conventional signal processing methods such as filtering the data .