Octave 中的重采样功能？

Question

I am trying to convert a MATLAB script into an Octave file. I am using Octave 4.0.

In the MATLAB script, I encountered a line with the format resample (X, tx, fx). Is there any equivalent function in Octave for this resample function?

I am not looking for the function resample (X, p, q).

As per the Mathworks website: y = resample(x,p,q) resamples the input sequence, x, at p/q times the original sample rate. y = resample(x,tx,fs) uses a polyphase antialiasing filter to resample the signal at the uniform sample rate specified in fs.

Answer 1

Please type in Octave:

 >>  help resample

Answer will be (in my computer I have installed this package before):

error: help: the 'resample' function belongs to the signal package from Octave Forge which you have installed but not loaded. To load the package, run `pkg load signal' from the Octave prompt.

You must install and load signal package . See instructions in file README.html in root Octave directory (example from Windows distributive):

• Run the script build_packages.m to build and install the packages. Installation is a one-time procedure. After installation packages must still be loaded in order to use them with the pkg load PACKAGENAME command.

Answer 2

In the documentation here it says there is one. You should be able to use it like below like in documentation.

[y, h] = resample (x, p, q)

Answer 3

For those who need the non-uniform to uniform resampling that Matlab's resample() provides but Octave's resample() does not, you can use interp1() instead.

 y = resample(X, tx, fs)

can be converted as

 samplecount = (max(tx) - min(tx)) * fs
 y = interp1(tx, X, linspace(min(tx), max(tx), samplecount))