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How to calculate Tone attack,sustain and decay time in the signal


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What you're looking for is called an ADSR (attack,decay, sustain, release) envelope calculation.  Pretty standard stuff in the audio world.  Lot's of discussions out there about how to do this.  The Sound and Vibration tool kit from NI might even contain this.  Or, check out: 

 

http://cnx.org/contents/18005ea2-b457-42c1-89c9-79ed1d57b73f@3/Musical-Signal-Processing-with

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