diff --git a/Transceiver52M/arm/mult.c b/Transceiver52M/arm/mult.c
new file mode 100644
index 0000000..245be50
--- /dev/null
+++ b/Transceiver52M/arm/mult.c
@@ -0,0 +1,56 @@
+/*
+ * NEON scaling
+ * Copyright (C) 2012,2013 Thomas Tsou <tom@tsou.cc>
+ *
+ * This library is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU Lesser General Public
+ * License as published by the Free Software Foundation; either
+ * version 2.1 of the License, or (at your option) any later version.
+ *
+ * This library 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
+ * Lesser General Public License for more details.
+ *
+ * You should have received a copy of the GNU Lesser General Public
+ * License along with this library; if not, write to the Free Software
+ * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
+ */
+
+#include <malloc.h>
+#include <string.h>
+#include <mult.h>
+
+#ifdef HAVE_CONFIG_H
+#include "config.h"
+#endif
+
+void neon_cmplx_mul_4n(float *, float *, float *, int);
+
+static void cmplx_mul_ps(float *out, float *a, float *b, int len)
+{
+	float ai, aq, bi, bq;
+
+	for (int i = 0; i < len; i++) {
+		ai = a[2 * i + 0];
+		aq = a[2 * i + 1];
+
+		bi = b[2 * i + 0];
+		bq = b[2 * i + 1];
+
+		out[2 * i + 0] = ai * bi - aq * bq;
+		out[2 * i + 1] = ai * bq + aq * bi;
+	}
+}
+
+void mul_complex(float *out, float *a, float *b, int len)
+{
+#ifdef HAVE_NEON
+	if (len % 4)
+		cmplx_mul_ps(out, a, b, len);
+	else
+		neon_cmplx_mul_4n(out, a, b, len >> 2);
+#else
+	cmplx_mul_ps(out, a, b, len);
+#endif
+}