wolffd@0: function y=EpslionFromTauFS(tau, fs)
wolffd@0: % EpsilonFromTauFS - Find first order filter coefficient
wolffd@0: % as a function of time constant (tau) and sample rate (fs)
wolffd@0: 
wolffd@0: % (c) 1998 Interval Research Corporation  
wolffd@0: y=1-exp(-1/tau/fs);