The present code is a Matlab function that provides an interpolation of a given signal in the time domain via zero-padding in the frequency domain. The algorithm is similar to that of the Matlab command “interpft”.
An example is given in order to clarify the usage of the function. For convenience, the input and output arguments are given in the beginning of the function.
The code is based on the theory described in:
 R. Lyons. Understanding Digital Signal Processing. Upper Saddle River, Prentice Hall, 2004.
A new version of the code has been uploaded.
The title of the submission has been changed.