Signal with noise...

theodsseytheodssey
edited December 2009 in Science & Tech
I have a long list of measurement with noise in a column matrix.
Using sound(measurement,8000) I get a tone, and this is supposed to be a number.

Could anybody tell me how I can get rid of noise and retrieve a number from this tone in matlab please?

Comments

  • shwaipshwaip bluffin' with my muffin Icrontian
    edited December 2009
    Could you be more specific/clear? I don't understand what you're trying to do.

    When you say "retrieve a number" what do you mean? Is there a number being spoken with a tone played over it? Or are you trying to do something else?
  • theodsseytheodssey
    edited December 2009
    when I use sound function with 8000 frequency, it makes a tone that sounds like a single tone sound when you push one of the numbers on lan phone with noise in it.

    I am supposed to find out the corresponding number to this sound.

    Thank you
  • shwaipshwaip bluffin' with my muffin Icrontian
    edited December 2009
    you can find the frequency of the tone using many different techniques (fft, spectrogram are two options). Then you can look up online what the standard frequencies are for the different numbers.
  • theodsseytheodssey
    edited December 2009
    Thank you~
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