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app_confbridge: Update dsp_silence_threshold and dsp_talking_threshold docs.

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The dsp_talking_threshold does not represent time in milliseconds.  It
represents the average magnitude per sample in the audio packets.  This is
what the DSP uses to determine if a packet is silence or talking/noise.

Change-Id: If6f939c100eb92a5ac6c21236559018eeaf58443
This commit is contained in:
Richard Mudgett
2018-01-30 15:00:32 -06:00
parent 2c4dde0ed0
commit 4a337b1a76
7 changed files with 151 additions and 110 deletions
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21
main/dsp.c
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@@ -124,12 +124,19 @@ static struct progress {
{ GSAMP_SIZE_UK, { 350, 400, 440 } }, /*!< UK */
};
/*!\brief This value is the minimum threshold, calculated by averaging all
* of the samples within a frame, for which a frame is determined to either
* be silence (below the threshold) or noise (above the threshold). Please
* note that while the default threshold is an even exponent of 2, there is
* no requirement that it be so. The threshold will accept any value between
* 0 and 32767.
/*!
* \brief Default minimum average magnitude threshold to determine talking/noise by the DSP.
*
* \details
* The magnitude calculated for this threshold is determined by
* averaging the absolute value of all samples within a frame.
*
* This value is the threshold for which a frame's average magnitude
* is determined to either be silence (below the threshold) or
* noise/talking (at or above the threshold). Please note that while
* the default threshold is an even exponent of 2, there is no
* requirement that it be so. The threshold will work for any value
* between 1 and 2^15.
*/
#define DEFAULT_THRESHOLD 512
@@ -399,7 +406,9 @@ typedef struct {
struct ast_dsp {
struct ast_frame f;
int threshold;
/*! Accumulated total silence in ms since last talking/noise. */
int totalsilence;
/*! Accumulated total talking/noise in ms since last silence. */
int totalnoise;
int features;
int ringtimeout;