diff --git a/dcs/utils/filter.py b/dcs/utils/filter.py
new file mode 100644
index 0000000..c081152
--- /dev/null
+++ b/dcs/utils/filter.py
@@ -0,0 +1,82 @@
+#  SPDX-License-Identifier: MPL-2.0
+#    Copyright (c) 2022 Philipp Le <philipp@philipple.de>.
+#  This Source Code Form is subject to the terms of the Mozilla Public
+#  License, v. 2.0. If a copy of the MPL was not distributed with this
+#  file, You can obtain one at https://mozilla.org/MPL/2.0/.
+
+from __future__ import annotations
+
+from tkinter import ttk
+from pydantic import confloat
+from dcs.config import ConfigObject, ui_create, ConfigControlFrame
+import scipy.signal
+import copy
+from abc import abstractmethod, ABC
+from typing import Optional
+
+from .signal import Signal
+
+
+class Filter(ABC):
+    @abstractmethod
+    def filter(self, signal_in: Signal) -> Signal:
+        ...
+
+
+class NoFilter(Filter):
+    def filter(self, signal_in: Signal) -> Signal:
+        return copy.deepcopy(signal_in)
+
+
+class IirFilter(Filter):
+    def __init__(self, b, a):
+        self.b = b
+        self.a = a
+
+    def filter(self, signal_in: Signal) -> Signal:
+        zi = scipy.signal.lfilter_zi(self.b, self.a)
+        z, _ = scipy.signal.lfilter(self.b, self.a, signal_in.signal, zi=zi*signal_in.signal[0])
+        return Signal(
+            t=signal_in.t,
+            signal=z,
+            sample_rate=signal_in.sample_rate,
+        )
+
+
+@ui_create
+class LowPassFilterBase(Filter, ConfigObject, ABC):
+    cutoff: confloat(ge=0) = 0.0
+    n: int = 5
+    _off_if_zero: bool = True
+
+    def filter(self, signal_in: Signal) -> Signal:
+        if (self.cutoff == 0) and self._off_if_zero:
+            return copy.deepcopy(signal_in)
+        else:
+            # b, a = scipy.signal.butter(N=n, Wn=cutoff, btype='low', fs=self.sample_rate, output='ba')
+            b, a = scipy.signal.cheby1(N=self.n, rp=1, Wn=self.cutoff, btype='low', fs=signal_in.sample_rate, output='ba')
+            iir = IirFilter(b, a)
+            return iir.filter(signal_in)
+
+
+def create_lp_filter_class(sample_rate: int, title: str, off_if_zero: bool = True, unit: Optional[str] = 'Hz'):
+    @ui_create
+    class _LowPassFilter(LowPassFilterBase):
+        cutoff: confloat(ge=0, lt=sample_rate/4, multiple_of=(4.0/sample_rate)) = 0.0
+        _off_if_zero: bool = off_if_zero
+
+        def make_config_widget(self, parent: ttk.Widget) -> ConfigControlFrame:
+            frm = ConfigControlFrame(parent)
+
+            ttk.Label(frm, text=f'{title} Low Pass Cut-Off:').grid(row=0, column=0)
+            w = self.ui_create_cutoff(frm)
+            frm.add_widget(w)
+            w.grid(row=0, column=1)
+            if unit is not None:
+                ttk.Label(frm, text=unit).grid(row=0, column=2)
+
+            return frm
+
+    _LowPassFilter.update_forward_refs(sample_rate=sample_rate, off_if_zero=off_if_zero)
+    return _LowPassFilter
+