The signal profile 38, which is shown as a dashed line, relates to the situation where {TAIL ~ the amplitudes} of the in phase signal 16 and of {HEAD ~ the quadrature signal} 17 are constant—this is the situation corresponding to the prior art 
The signal profile 38 , which is shown as a dashed line , relates to the situation where { TAIL ~ the amplitudes } of the in phase signal 16 and of { HEAD ~ the quadrature signal } 17 are constant — this is the situation corresponding to the prior art
OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD HEAD OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH