#include <inttypes.h>
#include <math.h>
#include "spandsp/telephony.h"
#include "spandsp/dds.h"
Defines | |
#define | M_PI 3.14159265358979323846 |
#define | SLENK 7 |
#define | DDS_STEPS (1 << SLENK) |
#define | DDS_SHIFT (32 - 2 - SLENK) |
Functions | |
int32_t | dds_phase_step (float frequency) |
Find the phase step value to achieve a particular frequency. | |
int | dds_scaling_dbm0 (float level) |
Find the scaling factor needed to achieve a specified level in dBm0. | |
int | dds_scaling_dbov (float level) |
int16_t | dds_lookup (uint32_t phase) |
Find the amplitude for a particular phase. | |
int16_t | dds_offset (uint32_t phase_acc, int32_t phase_offset) |
Find the amplitude for a particular phase offset from an accumulated phase. | |
int16_t | dds (uint32_t *phase_acc, int32_t phase_rate) |
Generate an integer tone sample. | |
int16_t | dds_mod (uint32_t *phase_acc, int32_t phase_rate, int scale, int32_t phase) |
Generate an integer tone sample, with modulation. | |
icomplex_t | dds_complex (uint32_t *phase_acc, int32_t phase_rate) |
Generate a complex integer tone sample. | |
icomplex_t | dds_mod_complex (uint32_t *phase_acc, int32_t phase_rate, int scale, int32_t phase) |
int16_t dds | ( | uint32_t * | phase_acc, | |
int32_t | phase_rate | |||
) |
Generate an integer tone sample.
phase_acc | A pointer to a phase accumulator value. | |
phase_rate | The phase increment to be applied. |
icomplex_t dds_complex | ( | uint32_t * | phase_acc, | |
int32_t | phase_rate | |||
) |
Generate a complex integer tone sample.
phase_acc | A pointer to a phase accumulator value. | |
phase_rate | The phase increment to be applied. |
int16_t dds_lookup | ( | uint32_t | phase | ) |
Find the amplitude for a particular phase.
phase | The desired phase 32 bit phase. |
int16_t dds_mod | ( | uint32_t * | phase_acc, | |
int32_t | phase_rate, | |||
int | scale, | |||
int32_t | phase | |||
) |
Generate an integer tone sample, with modulation.
phase_acc | A pointer to a phase accumulator value. | |
phase_rate | The phase increment to be applied. | |
scale | The scaling factor. | |
phase | The phase offset. |
int16_t dds_offset | ( | uint32_t | phase_acc, | |
int32_t | phase_offset | |||
) |
Find the amplitude for a particular phase offset from an accumulated phase.
phase_acc | The accumulated phase. | |
phase_offset | The phase offset. |
int32_t dds_phase_step | ( | float | frequency | ) |
Find the phase step value to achieve a particular frequency.
frequency | The desired frequency, in Hertz. |
int dds_scaling_dbm0 | ( | float | level | ) |
Find the scaling factor needed to achieve a specified level in dBm0.
level | The desired signal level, in dBm0. |