MATLAB: Sample rate (Fs) in audiowrite

Question

Version: MATLAB R2018

In the document of audiowrite, it is written that the sample rate is any positive scalar between 44100 and 4800 Hz. However, the function accepts sample rates below 44100 Hz, e.g., 39063. More importantly, the document does not mention that the input sample rate must be integer, but the function throws an exception if the sample rate is not an integer.

Answer 1

Yes, the documentation does not match the actual code of audiowrite, at least in R2018b and R2019a. The documentation states that "Values of Fs are truncated to integer boundaries" but audiowrite actually doesn't do any truncating and simply errors if Fs is not integer.

I'll report the bug. Most likely, the problem is with the documentation and you can only pass integer values as Fs (which would make sense since audio formats store it as integer).