The time-frequency domain sampling characteristics of periodic signal, the truncation error and the spectrum leakage error caused by asynchronous sampling are discussed in detail.
讨论了周期信号取样的时域频域特性、非同步取样引起的截断误差和频谱泄漏误差。
According to the frequency domain character of the filter and signal, the sampling rate matching principle of the filter in frequency domain is given in the first part of the paper.
先从滤波器和信号的频域特性出发给出了滤波器在频域的采样率匹配原则。
When the DPCA condition is not satisfied, the error of sampling position can be compensated by a linear phase in Doppler frequency domain.
在不满足DPCA条件时，采用在多普勒频域乘以线性相位的方法来实现平动补偿。
The traditional way is to obtain the sub-image by sampling the noised image in spatial or frequency domain, then calculate its variance to replace that of the original noise.
传统方法是通过空域或频域采样，得到该子噪声图像，然后直接对其估计方差，它对图像信息的分布有要求。
Firstly the frequency domain was discretized into limited points. And a logarithmic sampling method was used to select samples.
首先，把特定的载荷频率范围离散成有限点，并通过对数采样法进行预采样。
Even if the sampling rate is high, the method makes part of a low blood flow signal clearly visible in frequency domain, and more detailed blood flow sonogram can be obtained.
该方法可以在高采样频率条件下实现低流速血流信号的局部可视化，同时由于局部范围内采样分辨率的提高，将获得更细致的血流声谱图。
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.
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。
Based on Gaussian random process model and continuous-time system in time domain, this paper analyzes the effect on baseband and intermediate frequency sampling due to clock jitter.
该文从时域连续信号角度出发，按照高斯随机过程模型，分析了时钟抖动对基带和中频线性调频信号信噪比的影响并给出了近似公式。
Based on Gaussian random process model and continuous-time system in time domain, this paper analyzes the effect on baseband and intermediate frequency sampling due to clock jitter.
该文从时域连续信号角度出发，按照高斯随机过程模型，分析了时钟抖动对基带和中频线性调频信号信噪比的影响并给出了近似公式。
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