--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/spandsp-0.0.3/spandsp-0.0.3/src/complex_dds.c	Fri Jun 25 16:00:21 2010 +0200
@@ -0,0 +1,2173 @@
+/*
+ * SpanDSP - a series of DSP components for telephony
+ *
+ * complex_dds.c
+ *
+ * Written by Steve Underwood <steveu@coppice.org>
+ *
+ * Copyright (C) 2003 Steve Underwood
+ *
+ * All rights reserved.
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License version 2, as
+ * published by the Free Software Foundation.
+ *
+ * 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; if not, write to the Free Software
+ * Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
+ *
+ * $Id: complex_dds.c,v 1.19 2006/11/28 16:59:56 steveu Exp $
+ */
+
+/*! \file */
+
+#ifdef HAVE_CONFIG_H
+#include <config.h>
+#endif
+
+#include <stdio.h>
+#include <inttypes.h>
+#if defined(HAVE_TGMATH_H)
+#include <tgmath.h>
+#endif
+#if defined(HAVE_MATH_H)
+#include <math.h>
+#endif
+
+#include "spandsp/telephony.h"
+#include "spandsp/complex.h"
+#include "spandsp/dds.h"
+
+#define SLENK	    11
+#define SINELEN     (1 << SLENK)
+
+/* Precreating this table allows it to be in const memory, which might
+   have some performance advantage. */
+static const float sine_table[SINELEN] =
+{
+     0.00000000f,
+     0.00306796f,
+     0.00613588f,
+     0.00920375f,
+     0.01227154f,
+     0.01533921f,
+     0.01840673f,
+     0.02147408f,
+     0.02454123f,
+     0.02760815f,
+     0.03067480f,
+     0.03374117f,
+     0.03680722f,
+     0.03987293f,
+     0.04293826f,
+     0.04600318f,
+     0.04906767f,
+     0.05213170f,
+     0.05519524f,
+     0.05825826f,
+     0.06132074f,
+     0.06438263f,
+     0.06744392f,
+     0.07050457f,
+     0.07356456f,
+     0.07662386f,
+     0.07968244f,
+     0.08274026f,
+     0.08579731f,
+     0.08885355f,
+     0.09190896f,
+     0.09496350f,
+     0.09801714f,
+     0.10106986f,
+     0.10412163f,
+     0.10717242f,
+     0.11022221f,
+     0.11327095f,
+     0.11631863f,
+     0.11936521f,
+     0.12241068f,
+     0.12545498f,
+     0.12849811f,
+     0.13154003f,
+     0.13458071f,
+     0.13762012f,
+     0.14065824f,
+     0.14369503f,
+     0.14673047f,
+     0.14976453f,
+     0.15279719f,
+     0.15582840f,
+     0.15885814f,
+     0.16188639f,
+     0.16491312f,
+     0.16793829f,
+     0.17096189f,
+     0.17398387f,
+     0.17700422f,
+     0.18002290f,
+     0.18303989f,
+     0.18605515f,
+     0.18906866f,
+     0.19208040f,
+     0.19509032f,
+     0.19809841f,
+     0.20110463f,
+     0.20410897f,
+     0.20711138f,
+     0.21011184f,
+     0.21311032f,
+     0.21610680f,
+     0.21910124f,
+     0.22209362f,
+     0.22508391f,
+     0.22807208f,
+     0.23105811f,
+     0.23404196f,
+     0.23702361f,
+     0.24000302f,
+     0.24298018f,
+     0.24595505f,
+     0.24892761f,
+     0.25189782f,
+     0.25486566f,
+     0.25783110f,
+     0.26079412f,
+     0.26375468f,
+     0.26671276f,
+     0.26966833f,
+     0.27262136f,
+     0.27557182f,
+     0.27851969f,
+     0.28146494f,
+     0.28440754f,
+     0.28734746f,
+     0.29028468f,
+     0.29321916f,
+     0.29615089f,
+     0.29907983f,
+     0.30200595f,
+     0.30492923f,
+     0.30784964f,
+     0.31076715f,
+     0.31368174f,
+     0.31659338f,
+     0.31950203f,
+     0.32240768f,
+     0.32531029f,
+     0.32820984f,
+     0.33110631f,
+     0.33399965f,
+     0.33688985f,
+     0.33977688f,
+     0.34266072f,
+     0.34554132f,
+     0.34841868f,
+     0.35129276f,
+     0.35416353f,
+     0.35703096f,
+     0.35989504f,
+     0.36275572f,
+     0.36561300f,
+     0.36846683f,
+     0.37131719f,
+     0.37416406f,
+     0.37700741f,
+     0.37984721f,
+     0.38268343f,
+     0.38551605f,
+     0.38834505f,
+     0.39117038f,
+     0.39399204f,
+     0.39680999f,
+     0.39962420f,
+     0.40243465f,
+     0.40524131f,
+     0.40804416f,
+     0.41084317f,
+     0.41363831f,
+     0.41642956f,
+     0.41921689f,
+     0.42200027f,
+     0.42477968f,
+     0.42755509f,
+     0.43032648f,
+     0.43309382f,
+     0.43585708f,
+     0.43861624f,
+     0.44137127f,
+     0.44412214f,
+     0.44686884f,
+     0.44961133f,
+     0.45234959f,
+     0.45508359f,
+     0.45781330f,
+     0.46053871f,
+     0.46325978f,
+     0.46597650f,
+     0.46868882f,
+     0.47139674f,
+     0.47410021f,
+     0.47679923f,
+     0.47949376f,
+     0.48218377f,
+     0.48486925f,
+     0.48755016f,
+     0.49022648f,
+     0.49289819f,
+     0.49556526f,
+     0.49822767f,
+     0.50088538f,
+     0.50353838f,
+     0.50618665f,
+     0.50883014f,
+     0.51146885f,
+     0.51410274f,
+     0.51673180f,
+     0.51935599f,
+     0.52197529f,
+     0.52458968f,
+     0.52719913f,
+     0.52980362f,
+     0.53240313f,
+     0.53499762f,
+     0.53758708f,
+     0.54017147f,
+     0.54275078f,
+     0.54532499f,
+     0.54789406f,
+     0.55045797f,
+     0.55301671f,
+     0.55557023f,
+     0.55811853f,
+     0.56066158f,
+     0.56319934f,
+     0.56573181f,
+     0.56825895f,
+     0.57078075f,
+     0.57329717f,
+     0.57580819f,
+     0.57831380f,
+     0.58081396f,
+     0.58330865f,
+     0.58579786f,
+     0.58828155f,
+     0.59075970f,
+     0.59323230f,
+     0.59569930f,
+     0.59816071f,
+     0.60061648f,
+     0.60306660f,
+     0.60551104f,
+     0.60794978f,
+     0.61038281f,
+     0.61281008f,
+     0.61523159f,
+     0.61764731f,
+     0.62005721f,
+     0.62246128f,
+     0.62485949f,
+     0.62725182f,
+     0.62963824f,
+     0.63201874f,
+     0.63439328f,
+     0.63676186f,
+     0.63912444f,
+     0.64148101f,
+     0.64383154f,
+     0.64617601f,
+     0.64851440f,
+     0.65084668f,
+     0.65317284f,
+     0.65549285f,
+     0.65780669f,
+     0.66011434f,
+     0.66241578f,
+     0.66471098f,
+     0.66699992f,
+     0.66928259f,
+     0.67155895f,
+     0.67382900f,
+     0.67609270f,
+     0.67835004f,
+     0.68060100f,
+     0.68284555f,
+     0.68508367f,
+     0.68731534f,
+     0.68954054f,
+     0.69175926f,
+     0.69397146f,
+     0.69617713f,
+     0.69837625f,
+     0.70056879f,
+     0.70275474f,
+     0.70493408f,
+     0.70710678f,
+     0.70927283f,
+     0.71143220f,
+     0.71358487f,
+     0.71573083f,
+     0.71787005f,
+     0.72000251f,
+     0.72212819f,
+     0.72424708f,
+     0.72635916f,
+     0.72846439f,
+     0.73056277f,
+     0.73265427f,
+     0.73473888f,
+     0.73681657f,
+     0.73888732f,
+     0.74095113f,
+     0.74300795f,
+     0.74505779f,
+     0.74710061f,
+     0.74913639f,
+     0.75116513f,
+     0.75318680f,
+     0.75520138f,
+     0.75720885f,
+     0.75920919f,
+     0.76120239f,
+     0.76318842f,
+     0.76516727f,
+     0.76713891f,
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+     0.77106052f,
+     0.77301045f,
+     0.77495311f,
+     0.77688847f,
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+     0.78073723f,
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+     0.79023022f,
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+     0.79583690f,
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+     0.79953727f,
+     0.80137617f,
+     0.80320753f,
+     0.80503133f,
+     0.80684755f,
+     0.80865618f,
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+    -0.15279719f,
+    -0.14976453f,
+    -0.14673047f,
+    -0.14369503f,
+    -0.14065824f,
+    -0.13762012f,
+    -0.13458071f,
+    -0.13154003f,
+    -0.12849811f,
+    -0.12545498f,
+    -0.12241068f,
+    -0.11936521f,
+    -0.11631863f,
+    -0.11327095f,
+    -0.11022221f,
+    -0.10717242f,
+    -0.10412163f,
+    -0.10106986f,
+    -0.09801714f,
+    -0.09496350f,
+    -0.09190896f,
+    -0.08885355f,
+    -0.08579731f,
+    -0.08274026f,
+    -0.07968244f,
+    -0.07662386f,
+    -0.07356456f,
+    -0.07050457f,
+    -0.06744392f,
+    -0.06438263f,
+    -0.06132074f,
+    -0.05825826f,
+    -0.05519524f,
+    -0.05213170f,
+    -0.04906767f,
+    -0.04600318f,
+    -0.04293826f,
+    -0.03987293f,
+    -0.03680722f,
+    -0.03374117f,
+    -0.03067480f,
+    -0.02760815f,
+    -0.02454123f,
+    -0.02147408f,
+    -0.01840673f,
+    -0.01533921f,
+    -0.01227154f,
+    -0.00920375f,
+    -0.00613588f,
+    -0.00306796f
+};
+
+int32_t dds_phase_ratef(float frequency)
+{
+    return (int32_t) (frequency*65536.0f*65536.0f/SAMPLE_RATE);
+}
+/*- End of function --------------------------------------------------------*/
+
+float dds_frequencyf(int32_t phase_rate)
+{
+    return (float) phase_rate*(float) SAMPLE_RATE/(65536.0f*65536.0f);
+}
+/*- End of function --------------------------------------------------------*/
+
+float dds_scaling_dbm0f(float level)
+{
+    return powf(10.0f, (level - DBM0_MAX_POWER)/20.0f)*(32767.0f*1.414214f);
+}
+/*- End of function --------------------------------------------------------*/
+
+float dds_scaling_dbovf(float level)
+{
+    return powf(10.0f, (level + 3.02f)/20.0f)*(32767.0f*1.414214f);
+}
+/*- End of function --------------------------------------------------------*/
+
+float ddsf(uint32_t *phase_acc, int32_t phase_rate)
+{
+    float amp;
+
+    amp = sine_table[*phase_acc >> (32 - SLENK)];
+    *phase_acc += phase_rate;
+    return amp;
+}
+/*- End of function --------------------------------------------------------*/
+
+float dds_modf(uint32_t *phase_acc, int32_t phase_rate, float scale, int32_t phase)
+{
+    float amp;
+
+    amp = sine_table[*(phase_acc + phase) >> (32 - SLENK)]*scale;
+    *phase_acc += phase_rate;
+    return amp;
+}
+/*- End of function --------------------------------------------------------*/
+
+/* This is a simple direct digital synthesis (DDS) function to generate complex
+   sine waves. */
+complexf_t dds_complexf(uint32_t *phase_acc, int32_t phase_rate)
+{
+    complexf_t amp;
+
+    amp = complex_setf(sine_table[(*phase_acc + (1 << 30)) >> (32 - SLENK)],
+                       sine_table[*phase_acc >> (32 - SLENK)]);
+    *phase_acc += phase_rate;
+    return amp;
+}
+/*- End of function --------------------------------------------------------*/
+
+/* This is a simple direct digital synthesis (DDS) function to generate complex
+   sine waves. */
+complexf_t dds_complex_modf(uint32_t *phase_acc, int32_t phase_rate, float scale, int32_t phase)
+{
+    complexf_t amp;
+
+    amp = complex_setf(sine_table[(*phase_acc + phase + (1 << 30)) >> (32 - SLENK)]*scale,
+                       sine_table[(*phase_acc + phase) >> (32 - SLENK)]*scale);
+    *phase_acc += phase_rate;
+    return amp;
+}
+/*- End of function --------------------------------------------------------*/
+/*- End of file ------------------------------------------------------------*/