Fix error in draft of dsp fixed shift wrapper

lisainstrument/fixed_shift_dsp.py

@@ -99,6 +99,11 @@ class FixedShiftWrapDSP(FixedShiftCore):
         a = make_numpy_array_1d_float(samples)
         res = dsp.timeshift(a, -self.shift, self._order)
 
+        if self.margin_left > 0:
+            res = res[self.margin_left :]
+        if self.margin_right > 0:
+            res = res[: -self.margin_right]
+
         return make_numpy_array_1d(res)
 
     @staticmethod
@@ -130,7 +135,7 @@ def make_fixed_shift_dsp_dask(
     Arguments:
         left_bound: boundary treatment on the left
         right_bound: boundary treatment on the right
-        length: number of Lagrange plolynomials (=order + 1)
+        length: number of Lagrange polynomials (=order + 1)
 
     Returns:
         Fixed shift interpolator