相位失真

本文讨论的IIR滤波器是一种递归结构的数字滤波器，主要用于能够容忍相位失真而要求具有良好的衰减特性的高数据处理量的系统中。

IIR filters are a kind of digital filters with recursive structure and are primarily used for high data throughput applications that can tolerance phase distortion and require a sharp cut-off characteristic .

在多载波DMT通信系统中，同时采用时域均衡器和频域均衡器来补偿各个子信道的幅度和相位失真。

In the multi-carrier modulation of DMT communication system , both time domain and frequency domain equalizers are used to compensate for the magnitude and phase distortion within each subchannel .

对于时变水声信道，由于随机相位失真，常数模算法（constantmodulusalgorithm，CMA）的误码性能将严重下降。

Since random phase distortion , Constant Modulus Algorithm ( CMA ) had a bit error performance reduces greatly for time-varying acoustic channel .

提出RF正交幂级数预失真线性功率放大器方案，可同时改善放大器幅度、相位失真。

The contributions of the thesis are presented as follows : 1 . A RF quadrature power series predistortion linearizer is presented .

只要相位失真带来的不同频率分量之间的最大相对时移小于20ms，就不会影响对连续语音的正常理解。

The speech understanding will not be depressed provided that the maximum relative time shift between different frequency components due to phase distortion is less than 20 ms.

为了补偿数字电视发射机的频谱畸变与相位失真，以得到最佳的VSB频谱特性，可以在调制器中加入预均衡网络对频谱进行预畸变。

To minimize the frequency and phase distortion in a DTV transmitter in order to achieve best VSB frequency performance , a pre equalizer can be inserted into the modulator .

小波的对称性可以消除相位失真，减小重构误差。

The symmetry of wavelets can reduce phase and amplitude distortion .

用该模型解释了二进尺度小波级数零相位失真特性；

Explains why the series are with Zero-Phase Distortion .

一种有效补偿功率放大器幅度相位失真的研究

An Efficient Linearization Method of Compensating Amplitude and Phase Distortion of Power Amplifier

利用多通道数据可获得比单通道数据更好的相位失真估计。

Using the multiple channel datasets , the phase contamination estimation can be achieved .

信号的失真分为频率失真、相位失真和波形失真等三种。

Signal distortion includes three kinds of distortion : frequency , phase and waveform .

相位失真的根源剖析

Discussion of Phase Distortion

因此针对严重频率衰落和非线性相位失真信道，提出了一种分数采样的混合盲均衡算法，并获得了较快的收敛速度和较小的剩余均方误差。

Based on fractional sampling method , a new super-exponential iteration decision feedback blind equalization algorithm for severely nonlinear phase distortion channels was proposed .

另一种是用滤波器滤除不需要的边带，只剩下我们需要的携带数据的边带和一个未携带数据的边带达到避免相位失真的目的。

The other is with filters filter out some sidebands only leaving one sideband with data and one sideband without data to avoid phase distortion .

采用小波的信号分解和重构技术，先去除实测信号的高频噪声，再做无相位失真的低通滤波。

High-frequency noise is firstly eliminated from the testing data by using the wavelet reconstruction and decomposition technique , and a zero-phase low-pass filter is then applied to the reconstructed data .

数字式鉴相器的相位失真是导致产生寄生信号和额外相位噪声并使锁相环路不稳定的主要因素之一。

Distortion in digital phase / frequency detectors is one of the main factor in causing instability , spurious signals , and excessive phase noise in phaselocked loops ( PLLS ) .

仔细分析了幅度失真、相位失真、幅相不一致性等对接收机性能的影响，提出了数字域校正的方法。通过计算机仿真，表明了该方法的可行性。

The effect of amplitude distortion , phase distortion , amplitude and phase error on the performance of receiver is discussed in this paper , and a method of digital correction is proposed .

这些方法有，估计电离层的缓变相位失真的最大熵谱估计法、特征向量法和基于时频分析的谱估计法。

Those methods include : MESE ( Maximum Entropy Spectral Estimation ) , EV ( engen vector ) algorithms to estimate the slowly-changing phase pass perturbation , the estimation algorithm which bases on time-frequency analysis .

利用椭圆函数滤波器较陡的过渡带特性设计前向和后向滤波器，消除由于IIR滤波器造成滤波后的数据相位非线性失真。

A back and forward filter with steeper transitional band was designed of ellipse function . It can remove nonlinear phase distortion caused by IIR filter .

但是由于高频HF段的电波传输环境复杂，存在相位路径失真和多模式传输等多种不利因素，会导致接收到的杂波展宽，从而淹没于杂波附近的目标回波。

However , due to the complex propagation conditions of electromagnetic wave in HF band , many disadvantageous factors , such as phase path contamination and multimode propagation , will cause the neighboring target submerged in the spread clutter .

提出了一种新的多扫频接收方案，以改进对电离层相位路径失真的估计精度。

A novel multiple-sweep-frequency receiving scheme is proposed to improve the estimation accuracy of ionospheric phase path contamination .

由于符号间干扰的存在，通信信道中高速数据的传输对所传信号的幅度与相位产生失真。

High speed data transmissions over communication channels distort the transmitted signals in both amplitude and phase due to presence of Inter Symbol Interference ( ISI ) .

通过分析笛卡尔负反馈环路中信号幅度和相位非线性失真的影响，针对性的提出一种基带预失真技术。

The nonlinear distortions of amplitude and phase in the Cartesian feedback loop are analyzed . To compensate the distortion , a digital base band pre-distortion technique is established .

实际的物理信道除存在随机噪声外，信道的有限带宽效应使得发射的宽带混沌信号产生幅度与相位的失真；

Real physics channel except random noises , limited bandwidth impairs the amplitude and phase of the transmitted broadband chaotic signals , the multipath effect in wireless communication channel and the time-varying feature of channel can also distort the transmitted chaotic signals .

使用该模型对高斯二阶导数脉冲信号的波形失真进行仿真分析，得到了只发生相位响应失真、只发生幅度响应失真、以及同时发生相位&幅度响应失真的脉冲波形。

The simulation of second derivative of Gaussian pulse as UWB signal waveform is conducted . The distorted waveforms are obtained from only experienced phase response distortion , only experienced amplitude response distortion , and experienced both phase and amplitude response distortion , respectively .

仿真研究表明，对单频率成分、间隔较远的多频率成分以及密集频谱均可达到很好的校正效果，并可实现对相位的无失真校正，适合于对相位要求较高的实际场合。

Simulation calculation demonstrates that it can correct the frequency for the single or the multi-frequency components in the discrete spectrum .

针对传统小波变换不具有线性相位，相位失真会引起图像边缘的失真的情况，提出了一种新的基于双正交小波变换的医学图像融合方法。

This dissertation utilize biorthogonal wavelet transform merge medical image for avoiding phase distortion by conventional orthogonal wavelet transform , and introduce a new fusion method .

监测仪能够完成包括三相电压、三相电流的有效值、功率因数、三相不平衡、电压短期闪变、以及20次内的谐波、谐波相位、谐波失真总量等的测量。

Monitor apparatus can measure valid value of three phase voltage and current , power factor , three phase disequilibrium , instant flecker of short time and harmonic without twenty , degree and harmonic distortion total .

相对于IIR滤波器或模拟滤波器避免了因非线性相位滤波带来的失真问题。

This scheme can also avoid distortion resulting from non-linear filtering when compared with IIR digital filter or analog filter .

音响系统的相位、群延迟失真及测量

Measurement of Phase and Group Delay Distortion of Audio System