Add some baseband constructors.

Some of them I think I took out earlier...

firmware/baseband/channel_decimator.hpp

@@ -38,6 +38,17 @@ public:
 		By32,
 	};
 
+	constexpr ChannelDecimator(
+	) : decimation_factor { DecimationFactor::By32 }
+	{
+	}
+	
+	constexpr ChannelDecimator(
+		const DecimationFactor decimation_factor
+	) : decimation_factor { decimation_factor }
+	{
+	}
+
 	void set_decimation_factor(const DecimationFactor f) {
 		decimation_factor = f;
 	}
@@ -69,7 +80,7 @@ private:
 	dsp::decimate::DecimateBy2CIC3 cic_3;
 	dsp::decimate::DecimateBy2CIC3 cic_4;
 
-	DecimationFactor decimation_factor = DecimationFactor::By32;
+	DecimationFactor decimation_factor;
 
 	buffer_c16_t execute_decimation(buffer_c8_t buffer);
 };

firmware/baseband/clock_recovery.hpp

@@ -116,6 +116,16 @@ private:
 template<typename ErrorFilter>
 class ClockRecovery {
 public:
+	ClockRecovery(
+		const float sampling_rate,
+		const float symbol_rate,
+		ErrorFilter error_filter,
+		std::function<void(const float)> symbol_handler
+	) : symbol_handler { symbol_handler }
+	{
+		configure(sampling_rate, symbol_rate, error_filter);
+	}
+
 	ClockRecovery(
 		std::function<void(const float)> symbol_handler
 	) : symbol_handler { symbol_handler }

firmware/baseband/matched_filter.hpp

@@ -49,9 +49,17 @@ public:
 	using taps_t = tap_t[];
 
 	template<class T>
-	void configure(
+	MatchedFilter(
 		const T& taps,
 		size_t decimation_factor = 1
+	) {
+		configure(taps, decimation_factor);
+	}
+
+	template<class T>
+	void configure(
+		const T& taps,
+		size_t decimation_factor
 	) {
 		samples_ = std::make_unique<samples_t>(taps.size());
 		taps_reversed_ = std::make_unique<taps_t>(taps.size());

firmware/baseband/proc_fsk.hpp

@@ -37,6 +37,8 @@
 #include <cstddef>
 #include <bitset>
 
+#include "ais_baseband.hpp"
+
 class FSKProcessor : public BasebandProcessor {
 public:
 	using payload_t = std::bitset<1024>;
@@ -49,10 +51,11 @@ public:
 	void execute(buffer_c8_t buffer) override;
 
 private:
-	ChannelDecimator decimator;
+	ChannelDecimator decimator { ChannelDecimator::DecimationFactor::By32 };
-	dsp::matched_filter::MatchedFilter mf;
+	dsp::matched_filter::MatchedFilter mf { baseband::ais::rrc_taps_76k8_4t_p, 4 };
 
 	clock_recovery::ClockRecovery<clock_recovery::FixedErrorFilter> clock_recovery {
+		19200, 9600, { 0.0555f },
 		[this](const float symbol) { this->consume_symbol(symbol); }
 	};
 	symbol_coding::NRZIDecoder nrzi_decode;