Add domain.py to signal package

signal/domain.py

@@ -0,0 +1,30 @@
+
+import numpy as np
+
+__default_time = 2.0
+__default_steps = 200
+
+class Time:
+    __DefaultTime = 2.0
+    __DefaultSteps = 200
+
+    def __init__(self, sec=Time.__DefaultTime, samples=Time.__DefaultSteps):
+        self.sec = sec
+        self.samples = samples
+        self._domain = None
+
+    @property
+    def domain(self):
+        if self._domain == None:
+            self._domain = np.linspace(0, self.sec, num=self.samples + 1)
+        return self._domain
+
+    @property
+    def rate(self):
+        '''Number of samples per second.'''
+        return self.samples / self.sec
+
+    @property
+    def interval(self):
+        '''Amount of time between samples, in seconds.'''
+        return self.sec / self.samples