From 684b7fee5a73fffc5d8b0dc880233285fc863044 Mon Sep 17 00:00:00 2001
From: Ken Cooke <ken@highfidelity.io>
Date: Thu, 24 Aug 2017 11:20:22 -0700
Subject: [PATCH] DC filter cutoff at 0.5Hz

---
 libraries/audio/src/AudioGate.cpp | 8 ++++----
 1 file changed, 4 insertions(+), 4 deletions(-)

diff --git a/libraries/audio/src/AudioGate.cpp b/libraries/audio/src/AudioGate.cpp
index 0c4fe8b64c..a4d731a447 100644
--- a/libraries/audio/src/AudioGate.cpp
+++ b/libraries/audio/src/AudioGate.cpp
@@ -25,10 +25,10 @@ static inline int32_t saturateQ30(int32_t x) {
 }
 
 //
-// First-order DC-blocking filter, with zero at 1.0 and pole at 0.99994
+// First-order DC-blocking filter, with zero at 1.0 and pole at 0.9999
 //
-// -3dB @ 0.5 Hz (48KHz)
-// -3dB @ 0.2 Hz (24KHz)
+// -3dB @ 1.0 Hz (48KHz)
+// -3dB @ 0.5 Hz (24KHz)
 //
 // input in Q15, output in Q30
 //
@@ -41,7 +41,7 @@ public:
 
         x <<= 15;               // scale to Q30
         x -= _dcOffset;         // remove DC
-        _dcOffset += x >> 14;   // pole = (1.0 - 2^-14) = 0.99994
+        _dcOffset += x >> 13;   // pole = (1.0 - 2^-13) = 0.9999
     }
 };