Rebased code from new eried repo commits. Changed to to reflect strijar implementation. Fixed previous issue with old ssb-am-tx ui_mictx code.

firmware/common/dsp_sos.hpp

@@ -0,0 +1,51 @@
+/*
+ * Copyright (C) 2020 Belousov Oleg
+ *
+ * This file is part of PortaPack.
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation; either version 2, or (at your option)
+ * any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program; see the file COPYING.  If not, write to
+ * the Free Software Foundation, Inc., 51 Franklin Street,
+ * Boston, MA 02110-1301, USA.
+ */
+
+#ifndef __DSP_SOS_H__
+#define __DSP_SOS_H__
+
+#include "dsp_iir.hpp"
+
+#include <cstdint>
+#include <cstddef>
+
+template <size_t N>
+class SOSFilter {
+
+public:
+
+    void configure(const iir_biquad_df2_config_t config[N]) {
+        for (size_t i = 0; i < N; i++)
+            filters[i].configure(config[i]);
+    }
+
+    float execute(float value) {
+        for (auto &filter : filters)
+            value = filter.execute(value);
+        return value;
+    }
+
+private:
+
+    IIRBiquadDF2Filter filters[N];
+};
+
+#endif/*__DSP_SOS_H__*/