diff --git a/firmware/baseband/proc_ais.cpp b/firmware/baseband/proc_ais.cpp
index 7cb0f3cb..3db550ad 100644
--- a/firmware/baseband/proc_ais.cpp
+++ b/firmware/baseband/proc_ais.cpp
@@ -26,10 +26,24 @@
 #include "i2s.hpp"
 using namespace lpc43xx;
 
+#include "dsp_fir_taps.hpp"
+
+AISProcessor::AISProcessor() {
+	decim_0.configure(taps_11k0_decim_0.taps, 33554432);
+	decim_1.configure(taps_11k0_decim_1.taps, 131072);
+}
+
 void AISProcessor::execute(const buffer_c8_t& buffer) {
 	/* 2.4576MHz, 2048 samples */
 
-	auto decimator_out = decimator.execute(buffer);
+	const buffer_c16_t dst_buffer {
+		dst.data(),
+		dst.size()
+	};
+
+	const auto decim_0_out = decim_0.execute(buffer, dst_buffer);
+	const auto decim_1_out = decim_1.execute(decim_0_out, dst_buffer);
+	const auto decimator_out = decim_1_out;
 
 	/* 76.8kHz, 64 samples */
 	feed_channel_stats(decimator_out);
diff --git a/firmware/baseband/proc_ais.hpp b/firmware/baseband/proc_ais.hpp
index 16bf42b4..59812efb 100644
--- a/firmware/baseband/proc_ais.hpp
+++ b/firmware/baseband/proc_ais.hpp
@@ -42,11 +42,15 @@
 
 class AISProcessor : public BasebandProcessor {
 public:
+	AISProcessor();
+
 	void execute(const buffer_c8_t& buffer) override;
 
 private:
-	ChannelDecimator decimator { ChannelDecimator::DecimationFactor::By32 };
-	dsp::matched_filter::MatchedFilter mf { baseband::ais::rrc_taps_76k8_4t_p, 4 };
+	std::array<complex16_t, 512> dst;
+	dsp::decimate::FIRC8xR16x24FS4Decim8 decim_0;
+	dsp::decimate::FIRC16xR16x32Decim8 decim_1;
+	dsp::matched_filter::MatchedFilter mf { baseband::ais::rrc_taps_38k4_4t_p, 2 };
 
 	clock_recovery::ClockRecovery<clock_recovery::FixedErrorFilter> clock_recovery {
 		19200, 9600, { 0.0555f },
diff --git a/firmware/common/ais_baseband.hpp b/firmware/common/ais_baseband.hpp
index c693d610..1d7a2aa6 100644
--- a/firmware/common/ais_baseband.hpp
+++ b/firmware/common/ais_baseband.hpp
@@ -36,25 +36,17 @@ namespace ais {
 // cleaning up ISI.
 
 // Translate+RRC filter
-// sample=76.8k, deviation=2400, b=0.5, symbol=9600
-// Length: 32 taps, 4 symbols, 1 cycle of sinusoid
-constexpr std::array<std::complex<float>, 32> rrc_taps_76k8_4t_p { {
-	{  5.3368736990e-03f,  0.0000000000e+00f }, {  4.6850211151e-03f,  9.3190864122e-04f },
-	{  1.7970187432e-03f,  7.4434953528e-04f }, { -2.5478608559e-03f, -1.7024261963e-03f },
-	{ -6.6710920858e-03f, -6.6710920858e-03f }, { -8.6960320791e-03f, -1.3014531722e-02f },
-	{ -7.5474785839e-03f, -1.8221225159e-02f }, { -3.8115552023e-03f, -1.9161981995e-02f },
-	{ -8.1697309033e-19f, -1.3342183083e-02f }, {  3.6940784220e-05f, -1.8571386338e-04f },
-	{ -7.5474785839e-03f,  1.8221225159e-02f }, { -2.4954265902e-02f,  3.7346698152e-02f },
-	{ -5.1450054092e-02f,  5.1450054092e-02f }, { -8.3018814119e-02f,  5.5471398140e-02f },
-	{ -1.1321218147e-01f,  4.6894020990e-02f }, { -1.3498960022e-01f,  2.6851100952e-02f },
-	{ -1.4292666316e-01f,  1.7503468055e-17f }, { -1.3498960022e-01f, -2.6851100952e-02f },
-	{ -1.1321218147e-01f, -4.6894020990e-02f }, { -8.3018814119e-02f, -5.5471398140e-02f },
-	{ -5.1450054092e-02f, -5.1450054092e-02f }, { -2.4954265902e-02f, -3.7346698152e-02f },
-	{ -7.5474785839e-03f, -1.8221225159e-02f }, {  3.6940784220e-05f,  1.8571386338e-04f },
-	{  2.4509192710e-18f,  1.3342183083e-02f }, { -3.8115552023e-03f,  1.9161981995e-02f },
-	{ -7.5474785839e-03f,  1.8221225159e-02f }, { -8.6960320791e-03f,  1.3014531722e-02f },
-	{ -6.6710920858e-03f,  6.6710920858e-03f }, { -2.5478608559e-03f,  1.7024261963e-03f },
-	{  1.7970187432e-03f, -7.4434953528e-04f }, {  4.6850211151e-03f, -9.3190864122e-04f },
+// sample=38.4k, deviation=2400, b=0.5, symbol=9600
+// Length: 16 taps, 4 symbols, 1 cycles of sinusoid
+constexpr std::array<std::complex<float>, 16> rrc_taps_38k4_4t_p { {
+	{  1.0619794019e-02f,  0.0000000000e+00f }, {  3.5758705854e-03f,  1.4811740938e-03f },
+	{ -1.3274742629e-02f, -1.3274742629e-02f }, { -1.5018657262e-02f, -3.6258246051e-02f },
+	{  0.0000000000e+00f, -2.6549484581e-02f }, { -1.5018657262e-02f,  3.6258246051e-02f },
+	{ -1.0237997393e-01f,  1.0237997393e-01f }, { -2.2527985355e-01f,  9.3313970669e-02f },
+	{ -2.8440842032e-01f,  0.0000000000e+00f }, { -2.2527985355e-01f, -9.3313970669e-02f },
+	{ -1.0237997393e-01f, -1.0237997393e-01f }, { -1.5018657262e-02f, -3.6258246051e-02f },
+	{  0.0000000000e+00f,  2.6549484581e-02f }, { -1.5018657262e-02f,  3.6258246051e-02f },
+	{ -1.3274742629e-02f,  1.3274742629e-02f }, {  3.5758705854e-03f, -1.4811740938e-03f },
 } };
 
 } /* namespace ais */