sig_tone_descriptor_t Struct Reference

#include <sig_tone.h>

List of all members.

Public Attributes
int	tone_freq [2]
	The tones used.
int	tone_amp [2]
	The high and low tone amplitudes.
int	high_low_timeout
	The delay, in audio samples, before the high level tone drops to a low level tone.
int	sharp_flat_timeout
	Some signaling tone detectors use a sharp initial filter, changing to a broader band filter after some delay. This parameter defines the delay. 0 means it never changes.
int	notch_lag_time
	Parameters to control the behaviour of the notch filter, used to remove the tone from the voice path in some protocols.
int	notch_allowed
int	tone_on_check_time
	The tone on persistence check, in audio samples.
int	tone_off_check_time
	The tone off persistence check, in audio samples.
int	tones
struct {
float   notch_a1 [3]
float   notch_b1 [3]
float   notch_a2 [3]
float   notch_b2 [3]
}	tone [2]
	The coefficients for the cascaded bi-quads notch filter.
float	broad_a [3]
	Flat mode bandpass bi-quad parameters.
float	broad_b [3]
int32_t	notch_slugi
	The coefficients for the post notch leaky integrator.
int32_t	notch_slugp
int32_t	unfiltered_slugi
	The coefficients for the post modulus leaky integrator in the unfiltered data path. The prescale value incorporates the detection ratio. This is called the guard ratio in some protocols.
int32_t	unfiltered_slugp
int32_t	broad_slugi
	The coefficients for the post modulus leaky integrator in the bandpass filter data path.
int32_t	broad_slugp
int32_t	notch_threshold
	Masks which effectively threshold the notched, weighted and bandpassed data.
int32_t	unfiltered_threshold
int32_t	broad_threshold

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Detailed Description

Signaling tone descriptor. This defines the working state for a single instance of the transmit and receive sides of a signaling tone processor.

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The documentation for this struct was generated from the following file:

• sig_tone.h