more smooth random stairs

+signals/RandomStairs.m

@@ -183,7 +183,7 @@ classdef RandomStairs
 			else
                 %% gevrey-function filter
                 tk = obj.jumpingPoints(t);
-                T = mean(diff(tk)) / 4;
+                T = mean(diff(tk));
                 dt = misc.dt(t);
                 tau = 0:dt:T;
                 b = signals.gevrey.bump.g(tau, 1, T, 1.1);