diff --git a/firmware/baseband/dsp_iir_config.hpp b/firmware/baseband/dsp_iir_config.hpp
index 7e99ed03..371521c4 100644
--- a/firmware/baseband/dsp_iir_config.hpp
+++ b/firmware/baseband/dsp_iir_config.hpp
@@ -48,4 +48,12 @@ constexpr iir_biquad_config_t audio_deemph_300_6_config {
 	{  1.00000000f, -0.96148145f,  0.00000000f, },
 };
 
+// 75us RC time constant, used in broadcast FM in Americas, South Korea
+// scipy.signal.butter(1, 2122 / 24000.0, 'lowpass', analog=False)
+// NOTE: Technically, order-1 filter, b[2] = a[2] = 0.
+constexpr iir_biquad_config_t audio_deemph_2122_6_config {
+	{  0.12264116f,  0.12264116f,  0.00000000f, },
+	{  1.00000000f, -0.75471767f,  0.00000000f, },
+};
+
 #endif/*__DSP_IIR_CONFIG_H__*/
diff --git a/firmware/baseband/proc_wfm_audio.cpp b/firmware/baseband/proc_wfm_audio.cpp
index a708a9ac..d1bc8fe9 100644
--- a/firmware/baseband/proc_wfm_audio.cpp
+++ b/firmware/baseband/proc_wfm_audio.cpp
@@ -68,5 +68,7 @@ void WidebandFMAudio::execute(const buffer_c8_t& buffer) {
 
 	/* -> 48kHz int16_t[32] */
 	audio_hpf.execute_in_place(audio);
+	audio_deemph.execute_in_place(audio);
+
 	fill_audio_buffer(audio);
 }
diff --git a/firmware/baseband/proc_wfm_audio.hpp b/firmware/baseband/proc_wfm_audio.hpp
index 6b0fed88..91965cc7 100644
--- a/firmware/baseband/proc_wfm_audio.hpp
+++ b/firmware/baseband/proc_wfm_audio.hpp
@@ -50,6 +50,7 @@ private:
 	dsp::decimate::FIR64AndDecimateBy2Real audio_filter { audio_filter_taps.taps };
 
 	IIRBiquadFilter audio_hpf { audio_hpf_30hz_config };
+	IIRBiquadFilter audio_deemph { audio_deemph_2122_6_config };
 };
 
 #endif/*__PROC_WFM_AUDIO_H__*/