diff --git a/firmware/baseband/dsp_iir_config.hpp b/firmware/baseband/dsp_iir_config.hpp
index 961900c1..d238c6d2 100644
--- a/firmware/baseband/dsp_iir_config.hpp
+++ b/firmware/baseband/dsp_iir_config.hpp
@@ -30,6 +30,7 @@ constexpr iir_biquad_config_t audio_hpf_config {
 	{  1.00000000f, -1.94447766f,  0.94597794f, }
 };
 
+// scipy.signal.iirdesign(wp=8000 / 24000.0, ws= 4000 / 24000.0, gpass=1, gstop=18, ftype='ellip')
 constexpr iir_biquad_config_t non_audio_hpf_config {
 	{  0.51891061f, -0.95714180f,  0.51891061f },
 	{  1.0f       , -0.79878302f,  0.43960231f }
diff --git a/firmware/baseband/dsp_squelch.hpp b/firmware/baseband/dsp_squelch.hpp
index 06cb2cdd..37cf68a3 100644
--- a/firmware/baseband/dsp_squelch.hpp
+++ b/firmware/baseband/dsp_squelch.hpp
@@ -37,8 +37,6 @@ private:
 	static constexpr size_t N = 32;
 	static constexpr int16_t threshold = 3072;
 
-	// nyquist = 48000 / 2.0
-	// scipy.signal.iirdesign(wp=8000 / nyquist, ws= 4000 / nyquist, gpass=1, gstop=18, ftype='ellip')
 	IIRBiquadFilter non_audio_hpf { non_audio_hpf_config };
 };