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diff --git a/circuitpython/extmod/ulab/code/scipy/signal/signal.h b/circuitpython/extmod/ulab/code/scipy/signal/signal.h
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+
+/*
+ * This file is part of the micropython-ulab project,
+ *
+ * https://github.com/v923z/micropython-ulab
+ *
+ * The MIT License (MIT)
+ *
+ * Copyright (c) 2020-2021 Zoltán Vörös
+ *
+*/
+
+#ifndef _SCIPY_SIGNAL_
+#define _SCIPY_SIGNAL_
+
+#include "../../ulab.h"
+#include "../../ndarray.h"
+
+extern const mp_obj_module_t ulab_scipy_signal_module;
+
+MP_DECLARE_CONST_FUN_OBJ_VAR_BETWEEN(signal_spectrogram_obj);
+MP_DECLARE_CONST_FUN_OBJ_KW(signal_sosfilt_obj);
+
+#endif /* _SCIPY_SIGNAL_ */