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