Nyquist frequency
英
美 [ˈnaɪkwɪst ˈfriːkwənsi]
网络 Nyquist频率; 奈奎斯特频率; 乃奎斯特频率; 奎斯特频率; 奈奎斯特頻率
双语例句
- The method of digital interpolation beam-forming, demanding the sample frequency be equal to or a bit higher than Nyquist frequency.
借助数字内插波束形成方法，采样率只要求等于或略高于奈奎斯特频率，从而大大降低了对设备的性能需求。 - According to the Nyquist Theorem, the sampling rate must be more than twice the maximum frequency component of the signal being measured.
根据Nyquist定理，采样率必须是被测信号最高频率分量的两倍以上。 - Vibrational MTF is compared with that under static condition, and the results are consistent with simulation curve with a30% decrease at the Nyquist frequency.
对振动下系统MTF与静态情况下进行了实验比较，结果表明在相同奈奎斯特频率处下降0.3左右，与仿真结果一致。 - It is possible to output stripe pattern images even if the frequency of input chart is higher than the Nyquist limiting frequency of the system ( the phenomenon of aliasing). It can be explained by the frequency spectrum.
当采样频率大于Nyquist极限频率时发生混频现象，但仍可能有条纹出现，并由频谱分析进行了说明。 - From this class of pulses, some members can be found having faster decaying rate, bigger eye opening, more uniform envelope and stronger anti-multiple-access-interference capability than frequency domain square-root raised cosine Nyquist waveform.
通过这类脉冲，对于给定的滚降系数，可以找到衰减速度、眼图开启度、包络均匀性和抗多址干扰能力等性能均优于频域平方根升余弦Nyquist脉冲的波形。 - The results show that alignment between pixels of image bundle and input pattern has cyclic variation on measuring result of the CTF. The CTF value decreases with increasing of the frequency under Nyquist frequency.
结果表明，线列光纤传像束对比度调制传递函数值随位相呈周期性变化，在输入的空间频率小于Nyquist频率时，对比度调制传递函数值随频率的增大而减小。 - In some applications, sampling with Nyquist frequency may be hard to implement due to hardware limitation. Based on subsampling, a method which estimates the modulation rate and initial frequency of the ultra-wideband LFM signal is presented in this paper.
针对Nyquist采样频率过高、硬件实现困难的问题，提出一种基于欠采样的超宽带线性调频信号的调制斜率和初始频率估计方法。 - This total solution was applied to SORS system field test and has been confirmed to be very accurate based on the resolution, transfer function at Nyquist frequency, signal-to-noise ratio and average gray scale of the captured images.
该理论方法已得到了实际应用，从获得的遥感图像达到的分辨力、奈奎斯特（Nyquist）频率处的传递函数、信噪比和平均灰度层次均充分证明了该研究结果的正确性。 - With low sampling frequency ( below the Nyquist frequency) the background noise may be considered to be white because of aliasing, while it is colored with high sampling frequency ( above the Nyquist frequency).
在高采样频率条件下（高于奈奎斯特频率），背景噪声是有色的。 - The system can make the total signaling rate very close to the Nyquist rate of given frequency band through the use of a lot of subchannels.
该系统利用大量的子信道使得总的信号速率能够非常接近给定频带的奈奎斯特速率。 - In the research of tissue impedance spectroscopy measure me nt, the authors constructed a frequency sets that produce angularly equidistant points on the Nyquist loci.
在组织阻抗频谱测量研究中，作者提出了一种等角测量频率分布法，使测量频率点在Nyquist轨迹图中呈等角度分布。 - The design objective of a PID controller is to adjust the slope of Nyquist diagram of the plant at a given frequency and to improve the closed-loop performance.
该文中PID控制器的设计要求是，调整控制对象的Nyquist曲线在给定频率处的斜率，以提高闭环系统性能。 - Modulation Transfer Function of CCD Camera at Nyquist Frequency
CCD相机在系统奈奎斯特频率处的调制传递函数 - The Nyquist stability criterion judges the closed-loop systems 'stability, according to the system's open-loop frequency characteristic.
而Nyquist稳定判据则根据系统的开环频率特性判断闭环系统稳定性。 - It is shown that ISI can be reduced by introducing roll-off around the Nyquist frequency at the expense of small spectral inefficiency.
以小的频带损失在Nyquist频率附近引入滚降，可使ISI进一步减小。 - A high performance CMOS sample/ hold circuit is presented, which achieves 90-dB spurious-free dynamic range and 80-dB signal-to-noise ratio over Nyquist band in 60 MHz sampling frequency at 3 V supply.
介绍了一种高性能CMOS采样/保持电路。该电路在3V电源电压下，60MHz采样频率时，输入直到奈奎斯特频率仍能够达到90dB的最大信号谐波比（SFDR）和80dB的信噪比（SNR）。 - A first-order plus dead-time model is identified on the basis of relay feedback experiments. Nyquist curve is very close to that of large dead-time processes over a wide frequency range.
基于继电反馈试验，辨识出一阶加纯滞后模型，其Nyquist曲线在一个大的频率范围内接近于大滞后过程。 - When a signal is analyzed in the fractional Fourier domain, the lower sampling-rate could be adopted than the Nyquist sampling-rate, which means that the traditional sampling-rate conversion theory, founded in the frequency domain, could be disabled under the circumstances.
而在分数阶Fourier域中分析信号完全可用较低的抽样频率来抽样（低于Nyquist抽样率），这就意味着建立在频域上的传统抽样率转换理论将不再适用。 - When frequency of the input pattern is less than Nyquist frequency, the CTF value decreases with increase of the frequency.
在输入的空间频率小于Nyquist频率时，对比度调制传递函数值随频率的增大而减小。 - The calculation result of a typical system is: the MTF is 0.017 at the Nyquist Frequency, the system's actual resolution is 18.6 cycles/ mm.
传递函数对频率积分法计算表明：系统实际的分辨率为18.6cycles/mm。 - Its signal processing speed is far lower than the input Nyquist sampling rate while its matching filter and timed correction recovery can be effectively implemented in the frequency domain.
其特点是信号处理速率比输入Nyquist采样速率低得多，而且其中的匹配滤波器和定时校正恢复可以在频域上有效地实现。 - According to the characteristics of output signal spectra with offset dither, the resolution of time-interleaved ADC to the input signal with a frequency range from DC to Nyquist frequency can be improved by using low pass filters.
利用输入信号频率与采样频率互为质数的特点，可使并行交替式ADC系统对直流和奈奎斯特频率的输入信号幅度分辨力都能提高。 - Nyquist chart and Bode chart are methods to express frequency characteristic with graph.
用曲线图形表示系统的频率特性，可以绘制出极坐标图和对数坐标图。 - The classical Nyquist theorem says that if the rate for sampling a signal is at least twice the bandwidth of its frequency, signal can be reconstructed without distortion.
经典的奈奎斯特采样定理表明信号的采样率至少为信号带宽两倍，才能无失真地恢复原始信号。 - In the compressed sensing theory sampling rate is well below the Nyquist frequency, using non-adaptive linear projection to maintain the original structure of the signal, and reconstructing the original signal accurately by solving optimization problem.
压缩感知以远低于奈奎斯特频率进行采样，采用非自适应线性投影来保持信号的原始结构，通过数值最优化问题准确重构原始信号。 - In MRI, subsampling is used to reduce data scanning time which does not satisfy the Nyquist sampling frequency and result in image aliasing.
在磁共振成像中，为了减少扫描时间通常使用欠采样方式，但欠采样方式不满足奈奎斯特采样频率，从而引起混叠伪影。 - A front-end sample and hold circuit is maintained to ensure the performance when the frequency of the input signal is higher than the nyquist frequency.
为了保证采样高于奈奎斯特频率的输入信号时的线性度，输入端依然采用了采样/保持电路。 - The signal sampling process is restricted by the Nyquist sampling theorem, which requires that the sampling rate must be 2 times greater than the input signal frequency.
而信号采样过程受到奈奎斯特采样定理的限制，它要求采样率必须大于输入信号频率的2倍以上。 - The traditional Nyquist sampling theorem states that a signal can be reconstructed perfectly from its samples, only if it was sampled at a rate at least twice the highest frequency of the signal.
在传统的奈奎斯特采样过程中，为了准确的重构原始信号，要求采样频率不得低于信号最高频率的2倍。 - Traditional signal processing is based on the Nyquist sampling theorem, in which the signal is usually sampled firstly and then compressed, and the signal sampling and processing rate must be higher than the Nyquist frequency.
传统的信号处理是以奈奎斯特采样定理为基础的，信号通常先采样后压缩，而且必须以高于奈奎斯特频率的速率对信号进行采样和处理。