[scilab-Users] Amplitude Demodulation

[ray joseph]

Tom,

Brute force says fast Fourier transform (FFT).  With AM, the two signals undergo multiplication to produce a signal that can be represented by A*sin(wc)*sin(wi).  This resolves to a signal of A*(cos(wc-wi) - cos(wc+wi))/2.  

Please let me know how this helps.

ray
  ----- Original Message ----- 
  From: tom sedgman 
  To: users at lists.scilab.org 
  Sent: Thursday, April 29, 2010 9:52 AM
  Subject: [scilab-Users] Amplitude Demodulation


        Hi again everyone,

        I've got stuck, I'm trying to write code to calculate the amplitude and frequency of a low frequency amplitude modulation in a recording. My knowledge of coding is limited and online help isn't providing any answers. Any help on how to proceed would be greatly appreciated.

        Many thanks

        Tom
       

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