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1 /*
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2 * SpanDSP - a series of DSP components for telephony
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3 *
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4 * dds.h
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5 *
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6 * Written by Steve Underwood <steveu@coppice.org>
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7 *
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8 * Copyright (C) 2003 Steve Underwood
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9 *
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10 * All rights reserved.
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11 *
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12 * This program is free software; you can redistribute it and/or modify
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13 * it under the terms of the GNU General Public License version 2, as
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14 * published by the Free Software Foundation.
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15 *
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16 * This program is distributed in the hope that it will be useful,
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17 * but WITHOUT ANY WARRANTY; without even the implied warranty of
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18 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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19 * GNU General Public License for more details.
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20 *
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21 * You should have received a copy of the GNU General Public License
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22 * along with this program; if not, write to the Free Software
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23 * Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
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24 *
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25 * $Id: dds.h,v 1.9 2006/10/24 13:45:28 steveu Exp $
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26 */
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27
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28 /*! \file */
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29
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30 #if !defined(_DDS_H_)
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31 #define _DDS_H_
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32
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33 #include "complex.h"
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34
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35 #ifdef __cplusplus
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36 extern "C" {
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37 #endif
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38
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39 /*! \brief Find the phase rate value to achieve a particular frequency.
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40 \param frequency The desired frequency, in Hertz.
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41 \return The phase rate which while achieve the desired frequency.
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42 */
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43 int32_t dds_phase_rate(float frequency);
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44
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45 float dds_frequency(int32_t phase_rate);
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46
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47 /*! \brief Find the scaling factor needed to achieve a specified level in dBm0.
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48 \param level The desired signal level, in dBm0.
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49 \return The scaling factor.
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50 */
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51 int dds_scaling_dbm0(float level);
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52
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53 int dds_scaling_dbov(float level);
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54
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55 /*! \brief Find the amplitude for a particular phase.
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56 \param phase The desired phase 32 bit phase.
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57 \return The signal amplitude.
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58 */
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59 int16_t dds_lookup(uint32_t phase);
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60
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61 /*! \brief Find the amplitude for a particular phase offset from an accumulated phase.
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62 \param phase_acc The accumulated phase.
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63 \param phase_offset The phase offset.
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64 \return The signal amplitude.
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65 */
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66 int16_t dds_offset(uint32_t phase_acc, int32_t phase_offset);
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67
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68 /*! \brief Generate an integer tone sample.
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69 \param phase_acc A pointer to a phase accumulator value.
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70 \param phase_rate The phase increment to be applied.
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71 \return The signal amplitude, between -32767 and 32767.
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72 */
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73 int16_t dds(uint32_t *phase_acc, int32_t phase_rate);
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74
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75 /*! \brief Generate an integer tone sample, with modulation.
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76 \param phase_acc A pointer to a phase accumulator value.
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77 \param phase_rate The phase increment to be applied.
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78 \param scale The scaling factor.
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79 \param phase The phase offset.
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80 \return The signal amplitude.
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81 */
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82 int16_t dds_mod(uint32_t *phase_acc, int32_t phase_rate, int scale, int32_t phase);
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83
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84 /*! \brief Generate a complex integer tone sample.
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85 \param phase_acc A pointer to a phase accumulator value.
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86 \param phase_rate The phase increment to be applied.
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87 \return The complex signal amplitude, between -32767 and 32767.
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88 */
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89 icomplex_t dds_complex(uint32_t *phase_acc, int32_t phase_rate);
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90
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91 /*! \brief Generate a complex integer tone sample, with modulation.
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92 \param phase_acc A pointer to a phase accumulator value.
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93 \param phase_rate The phase increment to be applied.
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94 \param scale The scaling factor.
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95 \param phase The phase offset.
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96 \return The complex signal amplitude.
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97 */
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98 icomplex_t dds_complex_mod(uint32_t *phase_acc, int32_t phase_rate, int scale, int32_t phase);
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99
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100 int32_t dds_phase_ratef(float frequency);
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101
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102 float dds_frequencyf(int32_t phase_rate);
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103
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104 float dds_scaling_dbm0f(float level);
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105
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106 float dds_scaling_dbovf(float level);
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107
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108 /*! \brief Generate a floating point tone sample.
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109 \param phase_acc A pointer to a phase accumulator value.
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110 \param phase_rate The phase increment to be applied.
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111 \return The signal amplitude, between -32767 and 32767.
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112 */
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113 float ddsf(uint32_t *phase_acc, int32_t phase_rate);
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114
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115 /*! \brief Generate a floating point tone sample, with modulation.
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116 \param phase_acc A pointer to a phase accumulator value.
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117 \param phase_rate The phase increment to be applied.
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118 \param scale The scaling factor.
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119 \param phase The phase offset.
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120 \return The signal amplitude.
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121 */
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122 float dds_modf(uint32_t *phase_acc, int32_t phase_rate, float scale, int32_t phase);
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123
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124 /*! \brief Generate a complex floating point tone sample.
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125 \param phase_acc A pointer to a phase accumulator value.
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126 \param phase_rate The phase increment to be applied.
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127 \return The complex signal amplitude, between -32767 and 32767.
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128 */
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129 complexf_t dds_complexf(uint32_t *phase_acc, int32_t phase_rate);
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130
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131 /*! \brief Generate a complex floating point tone sample, with modulation.
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132 \param phase_acc A pointer to a phase accumulator value.
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133 \param phase_rate The phase increment to be applied.
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134 \param scale The scaling factor.
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135 \param phase The phase offset.
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136 \return The complex signal amplitude.
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137 */
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138 complexf_t dds_complex_modf(uint32_t *phase_acc, int32_t phase_rate, float scale, int32_t phase);
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139
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140 #ifdef __cplusplus
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141 }
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142 #endif
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143
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144 #endif
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145 /*- End of file ------------------------------------------------------------*/
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