MATLAB: Undefined variable “comm” or class “comm.FMBr​oadcastMod​ulator”. Why is this happening on the MATLAB Workspace window

Question

I am tryng to implement the following example. And i get an error. What could be the reason?

code:

audio = dsp.AudioFileReader('guitartune.wav','SamplesPerFrame',4410);

fmbMod = comm.FMBroadcastModulator('AudioSampleRate',audio.SampleRate, …

'SampleRate',240e3);

fmbDemod = comm.FMBroadcastDemodulator( …

'AudioSampleRate',audio.SampleRate, …

'SampleRate',240e3,'PlaySound',true);

Answer 1

Those are Communications Toolbox functions. You should be able to use them if you have the Communications Toolbox installed.