As sound energy is a mechanicalenergy it could be
converted into electricity asmechanical energy could be
converted into electricity bythe law of thermodynamics.
Sound energy could beeasily converted into heat energy
which could be easilyconverted into electricity but it is not
highly efficient asthe loss in conversion will be more
whereas the othermethod is converting sound energy to
electricity by piezoelectric material, piezo electric materials
are the crystalwhich converts mechanical strain to electric
energy bysuch method, fig 2.