resample
Change sampling rate by rational factorexpand all in pageSyntax
用有理因子改变采样率
y = resample(x,p,q)
y = resample(x,p,q,n)
y = resample(x,p,q,n,beta)
y = resample(x,p,q,b)
[y,b] = resample(x,p,q)
Description
描述
y = resample(x,p,q) resamples the sequence in vector x at p/q times the original sampling rate, using a polyphase filter implementation. p and q must be positive integers. The length of y is equal to ceil(length(x)*p/q). If x is a matrix, resample works down the columns of x.
y = resample(x,p,q) 使用多相滤波器实现对矢量X中的序列在原始采样率的P/Q倍上重新采样。p和q必须是正数。y的长度等于ceil(length(x)*p/q).如果x是矩阵，重采样作用于x的列
resample applies an anti-aliasing (lowpass) FIR filter to x during the resampling process. It designs the filter using firls with a Kaiser window.
重采样将FIR滤波器应用于重采样过程中的X。使用Kaiser窗口设计滤波器。
y = resample(x,p,q,n) uses n terms on either side of the current sample, x(k), to perform the resampling. The length of the FIR filter resample uses is proportional to n; larger values of n provide better accuracy at the expense of more computation time. The default for n is 10. If you let n = 0, resample performs a nearest-neighbor interpolation
y(k) = x(round((k-1)*q/p)+1)
where y(k) = 0 if the index to x is greater than length(x).
y = resample(x,p,q,n,beta) uses beta as the design parameter for the Kaiser window that resample employs in designing the lowpass filter. The default for beta is 5.
y = resample(x,p,q,b) filters x using the vector of filter coefficients b.
[y,b] = resample(x,p,q) returns the vector b, which contains the coefficients of the filter applied to x during the resampling process.
返回向量B，其中包含在重采样过程中应用到x的滤波器的系数。
实例：
Y = resample(X，100000，8000)；
内插实现增采样，100000/8000 = 25，提高25倍