Add another example to V10_kalmanfilter_demonstration.ipynb and change Noise(...) in Pysim/Block.py

notebooks/Pysim/Block.py

 import numpy
 sin = numpy.sin
-from random import triangular
+from random import gauss
 
 #########################################################################
 #### Abstract class for continuous time block in a block diagram ########
@@ -122,7 +122,7 @@ class UnknownWaveSource(Block):
 #########################################################################
             
 class Noise(Block):
-    def __init__(self,inp,out,Am):
+    def __init__(self,inp,out,sigma):
             super(Noise, self).__init__()
             self.noutput = 1
             self.outpos = numpy.zeros((self.noutput),dtype=numpy.int)
@@ -130,14 +130,13 @@ class Noise(Block):
             self.ninput = 1
             self.inpos = numpy.zeros((self.ninput),dtype=numpy.int)   
             self.inpos[0] = inp
-            self.Am = Am
+            self.sigma = sigma
             self.u = numpy.zeros((self.ninput))
             self.y = numpy.zeros((self.noutput))
-            #self.y[0] = startv
                     
     def Step(self,t,dt):
-            noise = ([self.Am*triangular(0.0,0.5,1.0)-(self.Am/2.0)])
-            self.y = self.u + numpy.array(noise)
+            noise = numpy.array([gauss(0,self.sigma)])
+            self.y = self.u + noise
 
 #########################################################################
 ######################### Square signal source ##########################