Added offset_t option to SLM(); removed trailing spaces

src/lasp/lasp_slm.py

@@ -27,7 +27,6 @@ class SLM:
     Multi-channel Sound Level Meter. Input data: time data with a certain
     sampling frequency. Output: time-weighted (fast/slow) sound pressure
     levels in dB(A/C/Z). Possibly in octave bands.
-
     """
 
     def __init__(self,
@@ -38,7 +37,8 @@ class SLM:
                  xmin = None,
                  xmax = None,
                  include_overall=True,
-                 level_ref_value=P_REF):
+                 level_ref_value=P_REF,
+                 offset_t=0):
         """
         Initialize a sound level meter object.
 
@@ -55,7 +55,7 @@ class SLM:
             include_overall: If true, a non-functioning filter is added which
             is used to compute the overall level.
             level_ref_value: Reference value for computing the levels in dB
-
+            offset_t: Offset to be added to output time data [s]
             """
 
         self.fbdesigner = fbdesigner
@@ -74,6 +74,7 @@ class SLM:
         nfilters = len(self.xs)
         if include_overall: nfilters +=1
         self.include_overall = include_overall
+        self.offset_t = offset_t
 
         spld = SPLFilterDesigner(fs)
         if fw == FreqWeighting.A:
@@ -153,7 +154,7 @@ class SLM:
         Ncur = levels.shape[0]
         tend = tstart + Ncur / self.fs_slm
 
-        t = np.linspace(tstart, tend, Ncur, endpoint=False)
+        t = np.linspace(tstart, tend, Ncur, endpoint=False) + self.offset_t
         self.N += Ncur
 
         output = {}