synthSweep

 Synthesize a logarithmic sine sweep
   [sweep invsweepfft sweepRate] = SYNTHSWEEP(T,FS,f1,f2,tail,AsdB) 
   generates a logarithmic sine sweep that starts at frequency f1 (Hz),
   stops at frequency f2 (Hz) and duration T (sec) at sample rate FS (Hz).
    
   usePlots indicates whether to show frequency characteristics of the
   sweep, and the optional AsdB is an amplitude suppression value in
   decibels to avoid clipping
   
   Developed at Oygo Sound LLC

   Equations from Muller and Massarani, "Transfer Function Measurement
   with Sweeps."

   Modified by Jacob Donley (jrd089@uowmail.edu.au) Nov 2016