diff --git a/Zmq/filterProcess.py b/Zmq/filterProcess.py
index 02175ed..a898049 100644
--- a/Zmq/filterProcess.py
+++ b/Zmq/filterProcess.py
@@ -128,7 +128,7 @@ class SlidingFilter(threading.Thread):
         # 8~30Hz带通FIR（65阶，线性相位）
         self.b_bp = signal.firwin(
             numtaps=65,
-            cutoff=[8/(self.srate/2), 30/(self.srate/2)],
+            cutoff=[0.5/(self.srate/2), 45/(self.srate/2)],
             pass_zero=False,
             window='hamming'
         )