spandsp 0.0.6
dds.h File Reference

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Macros

#define DDS_PHASE_RATE(frequency)
#define DDS_PHASE(angle)

Functions

float dds_phase_to_radians (uint32_t phase)
 Convert a 32 bit phase angle to an angle in radians, between 0 and 2*PI.
int32_t dds_phase_rate (float frequency)
 Find the phase rate value to achieve a particular frequency.
float dds_frequency (int32_t phase_rate)
 Find the frequency, in Hz, equivalent to a phase rate.
int16_t dds_scaling_dbm0 (float level)
 Find the scaling factor needed to achieve a specified level in dBm0.
int16_t dds_scaling_dbov (float level)
 Find the scaling factor needed to achieve a specified level in dBmov.
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.
void dds_advance (uint32_t *phase_acc, int32_t phase_rate)
 Advance the phase, without returning any new signal sample.
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, int16_t scale, int32_t phase)
 Generate an integer tone sample, with modulation.
complexi_t dds_lookup_complexi (uint32_t phase)
 Lookup the complex integer value of a specified phase.
complexi_t dds_complexi (uint32_t *phase_acc, int32_t phase_rate)
 Generate a complex integer tone sample.
complexi_t dds_complexi_mod (uint32_t *phase_acc, int32_t phase_rate, int16_t scale, int32_t phase)
 Generate a complex integer tone sample, with modulation.
complexi16_t dds_lookup_complexi16 (uint32_t phase)
 Generate a complex 16 bit integer tone sample.
complexi16_t dds_complexi16 (uint32_t *phase_acc, int32_t phase_rate)
 Generate a complex 16 bit integer tone sample.
complexi16_t dds_complexi16_mod (uint32_t *phase_acc, int32_t phase_rate, int16_t scale, int32_t phase)
 Generate a complex 16bit integer tone sample, with modulation.
complexi32_t dds_complexi32_mod (uint32_t *phase_acc, int32_t phase_rate, int16_t scale, int32_t phase)
 Generate a complex 32 bit integer tone sample, with modulation.
complexi32_t dds_lookup_complexi32 (uint32_t phase)
 Generate a complex 32 bit integer tone sample.
complexi32_t dds_complexi32 (uint32_t *phase_acc, int32_t phase_rate)
 Generate a complex 32 bit integer tone sample.
int32_t dds_phase_ratef (float frequency)
 Find the phase rate equivalent to a frequency, in Hz.
float dds_frequencyf (int32_t phase_rate)
 Find the frequency, in Hz, equivalent to a phase rate.
float dds_scaling_dbm0f (float level)
 Find the scaling factor equivalent to a dBm0 value.
float dds_scaling_dbovf (float level)
 Find the scaling factor equivalent to a dBmov value.
void dds_advancef (uint32_t *phase_acc, int32_t phase_rate)
 Advance the phase, without returning any new signal sample.
float ddsf (uint32_t *phase_acc, int32_t phase_rate)
 Generate a floating point tone sample.
float dds_lookupf (uint32_t phase)
 Lookup the floating point value of a specified phase.
float dds_modf (uint32_t *phase_acc, int32_t phase_rate, float scale, int32_t phase)
 Generate a floating point tone sample, with modulation.
complexf_t dds_complexf (uint32_t *phase_acc, int32_t phase_rate)
 Generate a complex floating point tone sample.
complexf_t dds_lookup_complexf (uint32_t phase_acc)
 Lookup the complex value of a specified phase.
complexf_t dds_complex_modf (uint32_t *phase_acc, int32_t phase_rate, float scale, int32_t phase)
 Generate a complex floating point tone sample, with modulation.

Macro Definition Documentation

◆ DDS_PHASE

#define DDS_PHASE ( angle)
Value:
(int32_t) ((uint32_t) (((angle < 0.0f) ? (360.0f + angle) : angle)*65536.0f*65536.0f/360.0f))

◆ DDS_PHASE_RATE

#define DDS_PHASE_RATE ( frequency)
Value:
(int32_t) ((frequency)*65536.0f*65536.0f/SAMPLE_RATE)

Function Documentation

◆ dds()

int16_t dds ( uint32_t * phase_acc,
int32_t phase_rate )

Generate an integer tone sample.

Parameters
phase_accA pointer to a phase accumulator value.
phase_rateThe phase increment to be applied.
Returns
The signal amplitude, between -32767 and 32767.

References dds_lookup().

◆ dds_advance()

void dds_advance ( uint32_t * phase_acc,
int32_t phase_rate )

Advance the phase, without returning any new signal sample.

Parameters
phase_accA pointer to a phase accumulator value.
phase_rateThe phase increment to be applied.

◆ dds_advancef()

void dds_advancef ( uint32_t * phase_acc,
int32_t phase_rate )

Advance the phase, without returning any new signal sample.

Parameters
phase_accA pointer to a phase accumulator value.
phase_rateThe phase increment to be applied.

◆ dds_complex_modf()

complexf_t dds_complex_modf ( uint32_t * phase_acc,
int32_t phase_rate,
float scale,
int32_t phase )

Generate a complex floating point tone sample, with modulation.

Parameters
phase_accA pointer to a phase accumulator value.
phase_rateThe phase increment to be applied.
scaleThe scaling factor.
phaseThe phase offset.
Returns
The complex signal amplitude, between (-1.0, -1.0) and (1.0, 1.0).

◆ dds_complexf()

complexf_t dds_complexf ( uint32_t * phase_acc,
int32_t phase_rate )

Generate a complex floating point tone sample.

Parameters
phase_accA pointer to a phase accumulator value.
phase_rateThe phase increment to be applied.
Returns
The complex signal amplitude, between (-1.0, -1.0) and (1.0, 1.0).

◆ dds_complexi()

complexi_t dds_complexi ( uint32_t * phase_acc,
int32_t phase_rate )

Generate a complex integer tone sample.

Parameters
phase_accA pointer to a phase accumulator value.
phase_rateThe phase increment to be applied.
Returns
The complex signal amplitude, between (-32767, -32767) and (32767, 32767).

References dds_lookup().

◆ dds_complexi16()

complexi16_t dds_complexi16 ( uint32_t * phase_acc,
int32_t phase_rate )

Generate a complex 16 bit integer tone sample.

Parameters
phase_accA pointer to a phase accumulator value.
phase_rateThe phase increment to be applied.
Returns
The complex signal amplitude, between (-32767, -32767) and (32767, 32767).

References dds_lookup().

◆ dds_complexi16_mod()

complexi16_t dds_complexi16_mod ( uint32_t * phase_acc,
int32_t phase_rate,
int16_t scale,
int32_t phase )

Generate a complex 16bit integer tone sample, with modulation.

Parameters
phase_accA pointer to a phase accumulator value.
phase_rateThe phase increment to be applied.
scaleThe scaling factor.
phaseThe phase offset.
Returns
The complex signal amplitude, between (-32767, -32767) and (32767, 32767).

References dds_lookup().

◆ dds_complexi32()

complexi32_t dds_complexi32 ( uint32_t * phase_acc,
int32_t phase_rate )

Generate a complex 32 bit integer tone sample.

Parameters
phase_accA pointer to a phase accumulator value.
phase_rateThe phase increment to be applied.
Returns
The complex signal amplitude, between (-32767, -32767) and (32767, 32767).

References dds_lookup().

◆ dds_complexi32_mod()

complexi32_t dds_complexi32_mod ( uint32_t * phase_acc,
int32_t phase_rate,
int16_t scale,
int32_t phase )

Generate a complex 32 bit integer tone sample, with modulation.

Parameters
phase_accA pointer to a phase accumulator value.
phase_rateThe phase increment to be applied.
scaleThe scaling factor.
phaseThe phase offset.
Returns
The complex signal amplitude, between (-32767, -32767) and (32767, 32767).

References dds_lookup().

◆ dds_complexi_mod()

complexi_t dds_complexi_mod ( uint32_t * phase_acc,
int32_t phase_rate,
int16_t scale,
int32_t phase )

Generate a complex integer tone sample, with modulation.

Parameters
phase_accA pointer to a phase accumulator value.
phase_rateThe phase increment to be applied.
scaleThe scaling factor.
phaseThe phase offset.
Returns
The complex signal amplitude, between (-32767, -32767) and (32767, 32767).

References dds_lookup().

◆ dds_frequency()

float dds_frequency ( int32_t phase_rate)

Find the frequency, in Hz, equivalent to a phase rate.

Parameters
phase_rateThe phase rate.
Returns
The equivalent frequency, in Hz.

◆ dds_frequencyf()

float dds_frequencyf ( int32_t phase_rate)

Find the frequency, in Hz, equivalent to a phase rate.

Parameters
phase_rateThe phase rate.
Returns
The equivalent frequency, in Hz.

Referenced by v17_rx_carrier_frequency(), v17_rx_restart(), v22bis_rx_carrier_frequency(), v27ter_rx_carrier_frequency(), and v29_rx_carrier_frequency().

◆ dds_lookup()

int16_t dds_lookup ( uint32_t phase)

Find the amplitude for a particular phase.

Lookup the integer value of a specified phase.

Parameters
phaseThe desired phase 32 bit phase.
Returns
The signal amplitude.
Parameters
phaseThe phase accumulator value to be looked up.
Returns
The signal amplitude, between -32767 and 32767.

Find the amplitude for a particular phase.

Parameters
phaseThe phase accumulator value to be looked up.
Returns
The signal amplitude, between -32767 and 32767.

Referenced by dds(), dds_complexi(), dds_complexi16(), dds_complexi16_mod(), dds_complexi32(), dds_complexi32_mod(), dds_complexi_mod(), dds_lookup_complexi(), dds_lookup_complexi16(), dds_lookup_complexi32(), dds_mod(), and dds_offset().

◆ dds_lookup_complexf()

complexf_t dds_lookup_complexf ( uint32_t phase_acc)

Lookup the complex value of a specified phase.

Parameters
phaseThe phase accumulator value to be looked up.
Returns
The complex signal amplitude, between (-1.0, -1.0) and (1.0, 1.0).

◆ dds_lookup_complexi()

complexi_t dds_lookup_complexi ( uint32_t phase)

Lookup the complex integer value of a specified phase.

Parameters
phaseThe phase accumulator value to be looked up.
Returns
The complex signal amplitude, between (-32767, -32767) and (32767, 32767).

References dds_lookup().

◆ dds_lookup_complexi16()

complexi16_t dds_lookup_complexi16 ( uint32_t phase)

Generate a complex 16 bit integer tone sample.

Parameters
phase_accA pointer to a phase accumulator value.
phase_rateThe phase increment to be applied.
Returns
The complex signal amplitude, between (-32767, -32767) and (32767, 32767).

References dds_lookup().

◆ dds_lookup_complexi32()

complexi32_t dds_lookup_complexi32 ( uint32_t phase)

Generate a complex 32 bit integer tone sample.

Parameters
phase_accA pointer to a phase accumulator value.
phase_rateThe phase increment to be applied.
Returns
The complex signal amplitude, between (-32767, -32767) and (32767, 32767).

References dds_lookup().

◆ dds_lookupf()

float dds_lookupf ( uint32_t phase)

Lookup the floating point value of a specified phase.

Parameters
phaseThe phase accumulator value to be looked up.
Returns
The signal amplitude, between -1.0 and 1.0.

◆ dds_mod()

int16_t dds_mod ( uint32_t * phase_acc,
int32_t phase_rate,
int16_t scale,
int32_t phase )

Generate an integer tone sample, with modulation.

Parameters
phase_accA pointer to a phase accumulator value.
phase_rateThe phase increment to be applied.
scaleThe scaling factor.
phaseThe phase offset.
Returns
The signal amplitude, between -32767 and 32767.

References dds_lookup().

Referenced by sig_tone_tx().

◆ dds_modf()

float dds_modf ( uint32_t * phase_acc,
int32_t phase_rate,
float scale,
int32_t phase )

Generate a floating point tone sample, with modulation.

Parameters
phase_accA pointer to a phase accumulator value.
phase_rateThe phase increment to be applied.
scaleThe scaling factor.
phaseThe phase offset.
Returns
The signal amplitude, between -1.0 and 1.0.

Referenced by super_tone_tx().

◆ dds_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.

Parameters
phase_accThe accumulated phase.
phase_offsetThe phase offset.
Returns
The signal amplitude.

References dds_lookup().

◆ dds_phase_rate()

int32_t dds_phase_rate ( float frequency)

Find the phase rate value to achieve a particular frequency.

Parameters
frequencyThe desired frequency, in Hz.
Returns
The phase rate which while achieve the desired frequency.

Referenced by modem_connect_tones_tx_init(), sig_tone_tx_init(), and tone_gen_descriptor_init().

◆ dds_phase_ratef()

int32_t dds_phase_ratef ( float frequency)

Find the phase rate equivalent to a frequency, in Hz.

Parameters
frequencyThe frequency, in Hz.
Returns
The equivalent phase rate.

Referenced by tone_gen_descriptor_init(), v17_tx_init(), v22bis_init(), v22bis_rx_restart(), v22bis_tx_power(), and v27ter_tx_init().

◆ dds_phase_to_radians()

float dds_phase_to_radians ( uint32_t phase)

Convert a 32 bit phase angle to an angle in radians, between 0 and 2*PI.

Parameters
phaseThe angle to convert.
Returns
The angle in radians.

◆ dds_scaling_dbm0()

int16_t dds_scaling_dbm0 ( float level)

Find the scaling factor needed to achieve a specified level in dBm0.

Parameters
levelThe desired signal level, in dBm0.
Returns
The scaling factor.

Referenced by fsk_tx_power(), modem_connect_tones_tx_init(), sig_tone_tx_init(), and tone_gen_descriptor_init().

◆ dds_scaling_dbm0f()

float dds_scaling_dbm0f ( float level)

Find the scaling factor equivalent to a dBm0 value.

Parameters
levelThe signal level in dBm0.
Returns
The equivalent scaling factor.

Referenced by dtmf_tx_set_level(), and tone_gen_descriptor_init().

◆ dds_scaling_dbov()

int16_t dds_scaling_dbov ( float level)

Find the scaling factor needed to achieve a specified level in dBmov.

Parameters
levelThe desired signal level, in dBmov.
Returns
The scaling factor.

◆ dds_scaling_dbovf()

float dds_scaling_dbovf ( float level)

Find the scaling factor equivalent to a dBmov value.

Parameters
levelThe signal level in dBmov.
Returns
The equivalent scaling factor.

◆ ddsf()

float ddsf ( uint32_t * phase_acc,
int32_t phase_rate )

Generate a floating point tone sample.

Parameters
phase_accA pointer to a phase accumulator value.
phase_rateThe phase increment to be applied.
Returns
The signal amplitude, between -1.0 and 1.0.