How come I keep getting "Data Clipped" in my Command Window?

Answer 1

[Star Strider]

You need to scale fur so that the maximum value is between [-1 +1] with wavwrite. Nice choice, BTW!

[Edgar]

Could you show me the end result of how the line of code should look like that can resolve my issue? And where do I paste it?

[Star Strider]

I no longer have wavwrite ( MATLAB R2014a has audioread and audoiwrite ) but the easiest way to scale fur to [-1 +1] is simply:

fur = fur/max(abs(fur));

Put it just before your wavwrite statement.

[Edgar]

When I added the code. I still get the data clipped message. See attached. Any suggestions?

[Star Strider]

As Walter Roberson noted in a similar answer, it may be necessary to scale it so that it’s never exactly [-1 +1].

Change the statement to :

fur = fur/max(abs(fur)+eps);

There’s a similar thread that started a few minutes ago.

[Edgar]

Ahaha wow this is something else. I am still getting the same clipped message :(

[Star Strider]

Your code doesn’t look very long. Post it as an attachment to your original question (use the ‘paperclip’ icon above the window). I'll run it and see if I can reproduce the error, and if all goes well, suggest a fix for the problem.

[Star Strider]

I would appreciate your formatting it. I makes it easier to read and copy. Highlight your code, then click the [{}Code] button above the window.

[Edgar]

Do you have an email address I could send you my code? I tried to post it, but .docx file is unsupported here for some odd reason.

[Walter Roberson]

Export the .docx as text . Include it as a .txt file.

[Edgar]

Done. I posted it under "project_2".

[Star Strider]

It works perfectly for me.

I experimented, and changing the scaling line to:

fur = fur/max(abs(fur)+1E-4);

doesn’t change the sound, and no longer generates the ‘clipping’ warning! (Even adding 1E-5 generated the ‘clipping’ warning. Strange.)

Also, I suggest you change the fft plot to:

plot(f,abs(z))

to plot the amplitude of the fft. Otherwise, the plot only plots the real part, and gives a warning about ignoring the imaginary part. You might also consider:

axis([-750  750    ylim])

just after the plot statement. There doesn’t seem to be anything of significance outside those limits.

[Edgar]

Thats weird. Could it be my version of matlab that is giving me problems?

[Star Strider]

It’s not your version of MATLAB, it’s some sort of idiosyncrasy in wavwrite. I’m getting it too in R2014a. That’s probably the reason audiowrite and audioread are replacing the others.

[Edgar]

I see, well my data clipping issue is resolved it doesn't popup anymore. Except my song doesnt work for some odd reasons because of format problems. I tried using windows media player and vlc media player and won't play the format for some reason. Any ideas?

[Star Strider]

It plays perfectly for me.

Add:

soundsc(x)

after the wavread statement to hear it. Playing x rather than fur verifies that it saved and read successfully.

[Edgar]

Yes! Its playing! Thanks so much! Now where can I control the song, meaning pause, play, stop, etc? It plays within matlab rather than an external app.

[Star Strider]

Great!

I haven’t experimented much with audioplayer, but apparently it has those capabilities. I know that sound and soundsc don’t. If you have audioplayer, experiment with it to see if it will do what you want.

[Edgar]

How do I change the code to audioplayer instead of soundsc (which I have)?

[Image Analyst]

Just rename the function calls. But I believe audioplayer() is with the latest, or very recent versions only. At least that's when I started to get warnings to use audioplayer() instead of sound(). If you have R2014a you should be okay.

[Edgar]

I have R2011b.

[Star Strider]

If you save the files to a format compatible with Windows Media Player or some such, you should be able to play them through it. I don’t have access to the wavwrite documentation, so you will have to explore that to see. I remember that it was possible to save to different formats, but I don’t have recent experience with wavwrite, so I don’t remember the details. You may also have to ask Windows Media Player what it likes. Earlier versions played ‘.wav’ files.

[Walter Roberson]

1E-5 might be lower than eps(abs(fur)). Instead of

fur/max(abs(fur)+eps);

should use

fur/max(abs(fur)*(1+eps));

or alternately

fur/max(abs(fur)+eps) * (1-eps);