X-Git-Url: https://git.sesse.net/?a=blobdiff_plain;f=mixer.cpp;h=03cf99d3435969891ccc1961d7f71c1b479861a5;hb=12f9082b06c037b76dc3a653643bdaeaea89f2d2;hp=d90359265b9cec2b722cbc5b141d9ffb1f943e8c;hpb=0f079f3c88e85d49208836642a579b4fd520fb76;p=nageru

diff --git a/mixer.cpp b/mixer.cpp
index d903592..03cf99d 100644
--- a/mixer.cpp
+++ b/mixer.cpp
@@ -149,6 +149,8 @@ Mixer::Mixer(const QSurfaceFormat &format, unsigned num_cards)
 
 	r128.init(2, OUTPUT_FREQUENCY);
 	r128.integr_start();
+
+	locut.init(FILTER_HPF, 2);
 }
 
 Mixer::~Mixer()
@@ -538,6 +540,11 @@ void Mixer::process_audio_one_frame()
 		}
 	}
 
+	// Cut away everything under 150 Hz; we don't need it for voice,
+	// and it will reduce headroom and confuse the compressor.
+	// (In particular, any hums at 50 or 60 Hz should be dampened.)
+	locut.render(samples_out.data(), samples_out.size() / 2, 150.0 * 2.0 * M_PI / OUTPUT_FREQUENCY, 0.5f);
+
 	// Apply a level compressor to get the general level right.
 	// Basically, if it's over about -40 dBFS, we squeeze it down to that level
 	// (or more precisely, near it, since we don't use infinite ratio),