相干采样在线计算器
相干采样是一种常用的信号采样方式，用于对高频信号进行采样并还原其基带信息。以下是一个简单的相干采样在线计算器，可以帮助您计算所需的采样率和混频器本地振荡频率。请注意：以下计算器的结果仅供参考。在实际采样时，您需要进一步验证参数，特别是与信号带宽、采样精度和噪声等因素有关的参数。
When performing FFT transformation, if you do not take coherent sampling, there will be some problems, such as spectrum leakage. In order to avoid spectrum leakage, there are generally two methods, one is to take the relevant sampling, the other is to use The window function compensates to reduce the spectral leakage, but it cannot be completely eliminated. There are different kinds of general window functions, and the appropriate window function can be selected according to the actual situation. Regarding the relevant sampling, it is necessary to follow certain rules: 1) The sampling signal needs to be divided into cycles; 2) Fs/N=Ft/M, Fs is the sampling frequency, N is the number of sampling points, and Ft is the frequency of the sampled signal, M The number of cycles sampled for the sampled signal; 3) In addition, M and N need to be prime numbers and need to be integers, which avoids repeated sampling and improves efficiency.