Matlab wavelets feature extraction

Discussion in 'Programmer's Corner' started by aswathymohan, Aug 9, 2013.

  1. aswathymohan

    Thread Starter New Member

    Nov 11, 2012
    3
    0
    Hi How to find out the amplitude and duration of a sine wave of different amplitudes?

    Consider a voltage sag ie, a 50hz signal of amplitude less than the normal one.I have to find out the amplitude and duration at wich this disturbance occurs.

    I have read some articles which gives some information that we can extract time and frequency information using wavelets db4 using multi resolution analysis .As i am a beginner i have just a rough idea about the work.Can anyone please direct me to accomplish my works and obtain output in matlab?

    Thanks
     
  2. MrChips

    Moderator

    Oct 2, 2009
    12,449
    3,368
    You can do a least-squares fit to a sine wave to determine the amplitude, frequency and phase.
     
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