Matlab wavelets feature extraction

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

  1. aswathymohan

    Thread Starter New Member

    Nov 11, 2012
    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?

  2. MrChips


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