{HEAD ~ The method} 12 wherein spreading {TAIL ~ a spectrum} of harmonic frequencies in pulse width modulator output signals for N channels comprises: 
wherein spreading
{ HEAD ~ The method } 12 wherein spreading { TAIL ~ a spectrum } of harmonic frequencies in pulse width modulator output signals for N channels comprises :
HEAD HEAD HEAD HEAD HEAD HEAD OTH REL REL TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH