In principle, however, {HEAD ~ the method} can also be realized in that the distorted signal {TAIL ~ S4} is obtained directly from the linear input signal S1 
In principle , however , { HEAD ~ the method } can also be realized in that the distorted signal { TAIL ~ S4 } is obtained directly from the linear input signal S1
OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD OTH OTH OTH OTH OTH OTH OTH OTH OTH TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH OTH OTH OTH OTH