diff --git a/src/lasp/lasp_octavefilter.py b/src/lasp/lasp_octavefilter.py
index 56f1e89..fdcb39e 100644
--- a/src/lasp/lasp_octavefilter.py
+++ b/src/lasp/lasp_octavefilter.py
@@ -33,8 +33,10 @@ class OverallFilterBank:
         """
         Filter input data
         """
-        assert data.ndim == 2
-        assert data.shape[1] == 1, "invalid number of channels, should be 1"
+        if data.ndim == 1:
+            data = data[:, None]
+        elif data.ndim == 2:
+            assert data.shape[1] == 1, "invalid number of channels, should be 1"
 
         if data.shape[0] == 0:
             return {}