From c8f59bae854cccb6897c27424cce1a428c337286 Mon Sep 17 00:00:00 2001
From: Philip Balister <philip@opensdr.com>
Date: Tue, 13 Mar 2012 10:13:06 -0400
Subject: gr_fxpt : Add sincos function to class.
Signed-off-by: Philip Balister <philip@opensdr.com>
---
gnuradio-core/src/lib/general/gr_fxpt.h | 16 ++++++++++++++++
1 file changed, 16 insertions(+)
(limited to 'gnuradio-core/src/lib/general/gr_fxpt.h')
diff --git a/gnuradio-core/src/lib/general/gr_fxpt.h b/gnuradio-core/src/lib/general/gr_fxpt.h
index 5cf736dfbf..6f088769ab 100644
--- a/gnuradio-core/src/lib/general/gr_fxpt.h
+++ b/gnuradio-core/src/lib/general/gr_fxpt.h
@@ -79,6 +79,22 @@ public:
return s_sine_table[index][0] * (ux >> 1) + s_sine_table[index][1];
}
+ /*
+ * \brief Given a fixedpoint angle x, return float cos(x) and sin (x)
+ */
+ static void sincos(gr_int32 x, float *s, float *c)
+ {
+ gr_uint32 ux = x;
+ int sin_index = ux >> (WORDBITS - NBITS);
+ *s = s_sine_table[sin_index][0] * (ux >> 1) + s_sine_table[sin_index][1];
+
+ ux = x + 0x40000000;
+ int cos_index = ux >> (WORDBITS - NBITS);
+ *c = s_sine_table[cos_index][0] * (ux >> 1) + s_sine_table[cos_index][1];
+
+ return;
+ }
+
};
#endif /* INCLUDED_GR_FXPT_H */
--
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