How to generate a sound file with phased.FMCWWaveform

Hello,

I would like to generate a sound file (.wav) with phased.FMCWWaveform. The waveform should be between 19e3 and 20.5e3 Hz.

This is my current code:

if true
f0=19e3;
f1=20.5e3;
bw=f0:f1;
hw = phased.FMCWWaveform('SweepTime',10e-3,'SweepBandwidth',bw,'SweepDirection','Triangle','OutputFormat','Sweeps','NumSweeps',1);
plot(hw);
sf=44100;
x=step(hw);
audiowrite('test.wav',x,sf);
end

When I play the file I can hear the sound, so I assume there is something wrong. I also think, that Matlab ignores my frequency range. I would be very grateful if you could help me to solve this problem.

Best wishes, Tom

[Tom]

I think I have found a solution. I will try it tomorrow and post it here if it works :)

[Tom]

I use a vector for the frequency: bw = [19e3 20.5e3];

This seems to work, but as before I can here a sound when I play the file. So I assume there is another error. I would be very grateful if you could help me.

Kind regards Tom