some description changes

src/openqlab/analysis/servo_design.py

@@ -199,7 +199,10 @@ class Integrator(Filter):
 
     @property
     def description(self):
-        return "Int {0}".format(human_readable(self.corner_frequency, "Hz"))
+        return "Int {0}, Slope {1}".format(
+            human_readable(self.corner_frequency, "Hz"),
+            human_readable(self.second_parameter, "Hz"),
+        )
 
     @property
     def sF(self):
@@ -234,7 +237,10 @@ class Differentiator(Filter):
 
     @property
     def description(self):
-        return "Diff {0}".format(human_readable(self.corner_frequency, "Hz"))
+        return "Diff {0}, Slope {1}".format(
+            human_readable(self.corner_frequency, "Hz"),
+            human_readable(self.second_parameter, "Hz"),
+        )
 
     @property
     def sF(self):

src/tests/test_analysis/test_servo_design/test_servo_design.py

@@ -293,14 +293,14 @@ class TestServoDesign(unittest.TestCase):
 
     def test_description(self):
         self.sd.integrator(438)
-        self.assertEqual(self.sd.filters[0].description, "Int 438 Hz")
+        self.assertEqual(self.sd.filters[0].description, "Int 438 Hz, Slope 438 mHz")
         self.sd.filters[0].corner_frequency = 1200
-        self.assertEqual(self.sd.filters[0].description, "Int 1.2 kHz")
+        self.assertEqual(self.sd.filters[0].description, "Int 1.2 kHz, Slope 438 mHz")
 
         self.sd.differentiator(438)
-        self.assertEqual(self.sd.filters[1].description, "Diff 438 Hz")
+        self.assertEqual(self.sd.filters[1].description, "Diff 438 Hz, Slope 4.38 kHz")
         self.sd.filters[1].corner_frequency = 1200
-        self.assertEqual(self.sd.filters[1].description, "Diff 1.2 kHz")
+        self.assertEqual(self.sd.filters[1].description, "Diff 1.2 kHz, Slope 4.38 kHz")
 
         self.sd.lowpass(438)
         self.assertEqual(self.sd.filters[2].description, "LP2 438 Hz, Q=0.707")
@@ -322,7 +322,7 @@ class TestServoDesign(unittest.TestCase):
             "gain": 1.0,
             "filters": [
                 {
-                    "description": "Int 500 Hz",
+                    "description": "Int 500 Hz, Slope 500 mHz",
                     "sos": np.array(
                         [1.0156933, -0.98427528, 0.0, 1.0, -0.99996858, 0.0]
                     ),
@@ -392,7 +392,7 @@ class TestServoDesign(unittest.TestCase):
             "gain": 1.0,
             "filters": [
                 {
-                    "description": "Int 500 Hz",
+                    "description": "Int 500 Hz, Slope 500 mHz",
                     "sos": np.array(
                         [1.0156933, -0.98427528, 0.0, 1.0, -0.99996858, 0.0]
                     ),
@@ -408,7 +408,7 @@ class TestServoDesign(unittest.TestCase):
                     "index": 1,
                 },
                 {
-                    "description": "Int 500 Hz",
+                    "description": "Int 500 Hz, Slope 500 mHz",
                     "sos": np.array(
                         [1.0156933, -0.98427528, 0.0, 1.0, -0.99996858, 0.0]
                     ),