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git-svn-id: http://svn.openzap.org/svn/openzap/trunk@267 a93c3328-9c30-0410-af19-c9cd2b2d52af
This commit is contained in:
Anthony Minessale 2007-06-16 16:38:40 +00:00
parent cae2014e76
commit c80c4e3385
4 changed files with 157 additions and 157 deletions
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22
libs/openzap/src/include/libteletone_detect.h
View File

@ -54,7 +54,7 @@
* Exception: * Exception:
* The author hereby grants the use of this source code under the * The author hereby grants the use of this source code under the
* following license if and only if the source code is distributed * following license if and only if the source code is distributed
* as part of the openzap library. Any use or distribution of this * as part of the openzap library. Any use or distribution of this
* source code outside the scope of the openzap library will nullify the * source code outside the scope of the openzap library will nullify the
* following license and reinact the MPL 1.1 as stated above. * following license and reinact the MPL 1.1 as stated above.
* *
@ -80,7 +80,7 @@
* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
* "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
* LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
* A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER
* OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, * OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
* EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, * EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
* PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR * PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR
@ -105,9 +105,9 @@ extern "C" {
*/ */
#ifndef FALSE #ifndef FALSE
#define FALSE 0 #define FALSE 0
#ifndef TRUE #ifndef TRUE
#define TRUE (!FALSE) #define TRUE (!FALSE)
#endif #endif
#endif #endif
@ -123,13 +123,13 @@ extern "C" {
* Frequency tolerance +- 1.5% will detect, +-3.5% will reject * Frequency tolerance +- 1.5% will detect, +-3.5% will reject
*/ */
#define DTMF_THRESHOLD 8.0e7 #define DTMF_THRESHOLD 8.0e7
#define DTMF_NORMAL_TWIST 6.3 /* 8dB */ #define DTMF_NORMAL_TWIST 6.3 /* 8dB */
#define DTMF_REVERSE_TWIST 2.5 /* 4dB */ #define DTMF_REVERSE_TWIST 2.5 /* 4dB */
#define DTMF_RELATIVE_PEAK_ROW 6.3 /* 8dB */ #define DTMF_RELATIVE_PEAK_ROW 6.3 /* 8dB */
#define DTMF_RELATIVE_PEAK_COL 6.3 /* 8dB */ #define DTMF_RELATIVE_PEAK_COL 6.3 /* 8dB */
#define DTMF_2ND_HARMONIC_ROW 2.5 /* 4dB */ #define DTMF_2ND_HARMONIC_ROW 2.5 /* 4dB */
#define DTMF_2ND_HARMONIC_COL 63.1 /* 18dB */ #define DTMF_2ND_HARMONIC_COL 63.1 /* 18dB */
#define GRID_FACTOR 4 #define GRID_FACTOR 4
#define BLOCK_LEN 102 #define BLOCK_LEN 102
#define M_TWO_PI 2.0*M_PI #define M_TWO_PI 2.0*M_PI

18
libs/openzap/src/include/libteletone_generate.h
View File

@ -33,7 +33,7 @@
* Exception: * Exception:
* The author hereby grants the use of this source code under the * The author hereby grants the use of this source code under the
* following license if and only if the source code is distributed * following license if and only if the source code is distributed
* as part of the openzap library. Any use or distribution of this * as part of the openzap library. Any use or distribution of this
* source code outside the scope of the openzap library will nullify the * source code outside the scope of the openzap library will nullify the
* following license and reinact the MPL 1.1 as stated above. * following license and reinact the MPL 1.1 as stated above.
* *
@ -59,7 +59,7 @@
* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
* "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
* LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
* A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER
* OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, * OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
* EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, * EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
* PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR * PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR
@ -138,25 +138,25 @@ static __inline__ int32_t teletone_dds_phase_rate(teletone_process_t tone, uint3
static __inline__ int16_t teletone_dds_state_modulate_sample(teletone_dds_state_t *dds, uint32_t pindex) static __inline__ int16_t teletone_dds_state_modulate_sample(teletone_dds_state_t *dds, uint32_t pindex)
{ {
int32_t bitmask = dds->phase_accumulator, sine_index = (bitmask >>= 23) & SINE_TABLE_LEN; int32_t bitmask = dds->phase_accumulator, sine_index = (bitmask >>= 23) & SINE_TABLE_LEN;
int16_t sample; int16_t sample;
if (pindex >= MAX_PHASE_TONES) { if (pindex >= MAX_PHASE_TONES) {
pindex = 0; pindex = 0;
} }
if (bitmask & SINE_TABLE_MAX) { if (bitmask & SINE_TABLE_MAX) {
sine_index = SINE_TABLE_LEN - sine_index; sine_index = SINE_TABLE_LEN - sine_index;
} }
sample = TELETONE_SINES[sine_index]; sample = TELETONE_SINES[sine_index];
if (bitmask & (SINE_TABLE_MAX * 2)) { if (bitmask & (SINE_TABLE_MAX * 2)) {
sample *= -1; sample *= -1;
} }
dds->phase_accumulator += dds->phase_rate[pindex]; dds->phase_accumulator += dds->phase_rate[pindex];
return (int16_t) (sample * dds->scale_factor >> 15); return (int16_t) (sample * dds->scale_factor >> 15);
} }
static __inline__ void teletone_dds_state_set_tx_level(teletone_dds_state_t *dds, float tx_level) static __inline__ void teletone_dds_state_set_tx_level(teletone_dds_state_t *dds, float tx_level)

256
libs/openzap/src/libteletone_detect.c
View File

@ -54,7 +54,7 @@
* Exception: * Exception:
* The author hereby grants the use of this source code under the * The author hereby grants the use of this source code under the
* following license if and only if the source code is distributed * following license if and only if the source code is distributed
* as part of the openzap library. Any use or distribution of this * as part of the openzap library. Any use or distribution of this
* source code outside the scope of the openzap library will nullify the * source code outside the scope of the openzap library will nullify the
* following license and reinact the MPL 1.1 as stated above. * following license and reinact the MPL 1.1 as stated above.
* *
@ -80,7 +80,7 @@
* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
* "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
* LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
* A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER
* OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, * OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
* EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, * EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
* PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR * PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR
@ -106,64 +106,64 @@ static teletone_detection_descriptor_t dtmf_detect_col[GRID_FACTOR];
static teletone_detection_descriptor_t dtmf_detect_row_2nd[GRID_FACTOR]; static teletone_detection_descriptor_t dtmf_detect_row_2nd[GRID_FACTOR];
static teletone_detection_descriptor_t dtmf_detect_col_2nd[GRID_FACTOR]; static teletone_detection_descriptor_t dtmf_detect_col_2nd[GRID_FACTOR];
static float dtmf_row[] = {697.0f, 770.0f, 852.0f, 941.0f}; static float dtmf_row[] = {697.0f, 770.0f, 852.0f, 941.0f};
static float dtmf_col[] = {1209.0f, 1336.0f, 1477.0f, 1633.0f}; static float dtmf_col[] = {1209.0f, 1336.0f, 1477.0f, 1633.0f};
static char dtmf_positions[] = "123A" "456B" "789C" "*0#D"; static char dtmf_positions[] = "123A" "456B" "789C" "*0#D";
static void goertzel_init(teletone_goertzel_state_t *goertzel_state, teletone_detection_descriptor_t *tdesc) { static void goertzel_init(teletone_goertzel_state_t *goertzel_state, teletone_detection_descriptor_t *tdesc) {
goertzel_state->v2 = goertzel_state->v3 = 0.0; goertzel_state->v2 = goertzel_state->v3 = 0.0;
goertzel_state->fac = tdesc->fac; goertzel_state->fac = tdesc->fac;
} }
void teletone_goertzel_update(teletone_goertzel_state_t *goertzel_state, void teletone_goertzel_update(teletone_goertzel_state_t *goertzel_state,
int16_t sample_buffer[], int16_t sample_buffer[],
int samples) int samples)
{ {
int i; int i;
float v1; float v1;
for (i = 0; i < samples; i++) { for (i = 0; i < samples; i++) {
v1 = goertzel_state->v2; v1 = goertzel_state->v2;
goertzel_state->v2 = goertzel_state->v3; goertzel_state->v2 = goertzel_state->v3;
goertzel_state->v3 = goertzel_state->fac*goertzel_state->v2 - v1 + sample_buffer[i]; goertzel_state->v3 = goertzel_state->fac*goertzel_state->v2 - v1 + sample_buffer[i];
} }
} }
#define teletone_goertzel_result(gs) ((gs)->v3 * (gs)->v3 + (gs)->v2 * (gs)->v2 - (gs)->v2 * (gs)->v3 * (gs)->fac) #define teletone_goertzel_result(gs) ((gs)->v3 * (gs)->v3 + (gs)->v2 * (gs)->v2 - (gs)->v2 * (gs)->v3 * (gs)->fac)
void teletone_dtmf_detect_init (teletone_dtmf_detect_state_t *dtmf_detect_state, int sample_rate) void teletone_dtmf_detect_init (teletone_dtmf_detect_state_t *dtmf_detect_state, int sample_rate)
{ {
int i; int i;
float theta; float theta;
dtmf_detect_state->hit1 = dtmf_detect_state->hit2 = 0; dtmf_detect_state->hit1 = dtmf_detect_state->hit2 = 0;
for (i = 0; i < GRID_FACTOR; i++) { for (i = 0; i < GRID_FACTOR; i++) {
theta = M_TWO_PI*(dtmf_row[i]/(float)sample_rate); theta = M_TWO_PI*(dtmf_row[i]/(float)sample_rate);
dtmf_detect_row[i].fac = 2.0*cos(theta); dtmf_detect_row[i].fac = 2.0*cos(theta);
theta = M_TWO_PI*(dtmf_col[i]/(float)sample_rate); theta = M_TWO_PI*(dtmf_col[i]/(float)sample_rate);
dtmf_detect_col[i].fac = 2.0*cos(theta); dtmf_detect_col[i].fac = 2.0*cos(theta);
theta = M_TWO_PI*(dtmf_row[i]*2.0/(float)sample_rate); theta = M_TWO_PI*(dtmf_row[i]*2.0/(float)sample_rate);
dtmf_detect_row_2nd[i].fac = 2.0*cos(theta); dtmf_detect_row_2nd[i].fac = 2.0*cos(theta);
theta = M_TWO_PI*(dtmf_col[i]*2.0/(float)sample_rate); theta = M_TWO_PI*(dtmf_col[i]*2.0/(float)sample_rate);
dtmf_detect_col_2nd[i].fac = 2.0*cos(theta); dtmf_detect_col_2nd[i].fac = 2.0*cos(theta);
goertzel_init (&dtmf_detect_state->row_out[i], &dtmf_detect_row[i]); goertzel_init (&dtmf_detect_state->row_out[i], &dtmf_detect_row[i]);
goertzel_init (&dtmf_detect_state->col_out[i], &dtmf_detect_col[i]); goertzel_init (&dtmf_detect_state->col_out[i], &dtmf_detect_col[i]);
goertzel_init (&dtmf_detect_state->row_out2nd[i], &dtmf_detect_row_2nd[i]); goertzel_init (&dtmf_detect_state->row_out2nd[i], &dtmf_detect_row_2nd[i]);
goertzel_init (&dtmf_detect_state->col_out2nd[i], &dtmf_detect_col_2nd[i]); goertzel_init (&dtmf_detect_state->col_out2nd[i], &dtmf_detect_col_2nd[i]);
dtmf_detect_state->energy = 0.0; dtmf_detect_state->energy = 0.0;
} }
dtmf_detect_state->current_sample = 0; dtmf_detect_state->current_sample = 0;
dtmf_detect_state->detected_digits = 0; dtmf_detect_state->detected_digits = 0;
dtmf_detect_state->lost_digits = 0; dtmf_detect_state->lost_digits = 0;
dtmf_detect_state->digits[0] = '\0'; dtmf_detect_state->digits[0] = '\0';
dtmf_detect_state->mhit = 0; dtmf_detect_state->mhit = 0;
} }
void teletone_multi_tone_init(teletone_multi_tone_t *mt, teletone_tone_map_t *map) void teletone_multi_tone_init(teletone_multi_tone_t *mt, teletone_tone_map_t *map)
@ -213,17 +213,17 @@ int teletone_multi_tone_detect (teletone_multi_tone_t *mt,
float eng_sum = 0, eng_all[TELETONE_MAX_TONES]; float eng_sum = 0, eng_all[TELETONE_MAX_TONES];
int gtest = 0, see_hit = 0; int gtest = 0, see_hit = 0;
for (sample = 0; sample < samples; sample = limit) { for (sample = 0; sample < samples; sample = limit) {
mt->total_samples++; mt->total_samples++;
if ((samples - sample) >= (mt->min_samples - mt->current_sample)) { if ((samples - sample) >= (mt->min_samples - mt->current_sample)) {
limit = sample + (mt->min_samples - mt->current_sample); limit = sample + (mt->min_samples - mt->current_sample);
} else { } else {
limit = samples; limit = samples;
} }
for (j = sample; j < limit; j++) { for (j = sample; j < limit; j++) {
famp = sample_buffer[j]; famp = sample_buffer[j];
mt->energy += famp*famp; mt->energy += famp*famp;
@ -238,9 +238,9 @@ int teletone_multi_tone_detect (teletone_multi_tone_t *mt,
} }
} }
mt->current_sample += (limit - sample); mt->current_sample += (limit - sample);
if (mt->current_sample < mt->min_samples) { if (mt->current_sample < mt->min_samples) {
continue; continue;
} }
eng_sum = 0; eng_sum = 0;
@ -277,15 +277,15 @@ int teletone_multi_tone_detect (teletone_multi_tone_t *mt,
} }
} }
/* Reinitialise the detector for the next block */ /* Reinitialise the detector for the next block */
for(x = 0; x < mt->tone_count; x++) { for(x = 0; x < mt->tone_count; x++) {
goertzel_init (&mt->gs[x], &mt->tdd[x]); goertzel_init (&mt->gs[x], &mt->tdd[x]);
goertzel_init (&mt->gs2[x], &mt->tdd[x]); goertzel_init (&mt->gs2[x], &mt->tdd[x]);
} }
mt->energy = 0.0; mt->energy = 0.0;
mt->current_sample = 0; mt->current_sample = 0;
} }
return see_hit; return see_hit;
} }
@ -295,30 +295,30 @@ int teletone_dtmf_detect (teletone_dtmf_detect_state_t *dtmf_detect_state,
int16_t sample_buffer[], int16_t sample_buffer[],
int samples) int samples)
{ {
float row_energy[GRID_FACTOR]; float row_energy[GRID_FACTOR];
float col_energy[GRID_FACTOR]; float col_energy[GRID_FACTOR];
float famp; float famp;
float v1; float v1;
int i; int i;
int j; int j;
int sample; int sample;
int best_row; int best_row;
int best_col; int best_col;
char hit; char hit;
int limit; int limit;
hit = 0; hit = 0;
for (sample = 0; sample < samples; sample = limit) { for (sample = 0; sample < samples; sample = limit) {
/* BLOCK_LEN is optimised to meet the DTMF specs. */ /* BLOCK_LEN is optimised to meet the DTMF specs. */
if ((samples - sample) >= (BLOCK_LEN - dtmf_detect_state->current_sample)) { if ((samples - sample) >= (BLOCK_LEN - dtmf_detect_state->current_sample)) {
limit = sample + (BLOCK_LEN - dtmf_detect_state->current_sample); limit = sample + (BLOCK_LEN - dtmf_detect_state->current_sample);
} else { } else {
limit = samples; limit = samples;
} }
for (j = sample; j < limit; j++) { for (j = sample; j < limit; j++) {
int x = 0; int x = 0;
famp = sample_buffer[j]; famp = sample_buffer[j];
dtmf_detect_state->energy += famp*famp; dtmf_detect_state->energy += famp*famp;
@ -340,53 +340,53 @@ int teletone_dtmf_detect (teletone_dtmf_detect_state_t *dtmf_detect_state,
dtmf_detect_state->row_out2nd[x].v3 = dtmf_detect_state->row_out2nd[x].fac*dtmf_detect_state->row_out2nd[x].v2 - v1 + famp; dtmf_detect_state->row_out2nd[x].v3 = dtmf_detect_state->row_out2nd[x].fac*dtmf_detect_state->row_out2nd[x].v2 - v1 + famp;
} }
}
dtmf_detect_state->current_sample += (limit - sample);
if (dtmf_detect_state->current_sample < BLOCK_LEN) {
continue;
} }
/* We are at the end of a DTMF detection block */
/* Find the peak row and the peak column */
row_energy[0] = teletone_goertzel_result (&dtmf_detect_state->row_out[0]);
col_energy[0] = teletone_goertzel_result (&dtmf_detect_state->col_out[0]);
for (best_row = best_col = 0, i = 1; i < GRID_FACTOR; i++) { dtmf_detect_state->current_sample += (limit - sample);
row_energy[i] = teletone_goertzel_result (&dtmf_detect_state->row_out[i]); if (dtmf_detect_state->current_sample < BLOCK_LEN) {
if (row_energy[i] > row_energy[best_row]) { continue;
best_row = i; }
/* We are at the end of a DTMF detection block */
/* Find the peak row and the peak column */
row_energy[0] = teletone_goertzel_result (&dtmf_detect_state->row_out[0]);
col_energy[0] = teletone_goertzel_result (&dtmf_detect_state->col_out[0]);
for (best_row = best_col = 0, i = 1; i < GRID_FACTOR; i++) {
row_energy[i] = teletone_goertzel_result (&dtmf_detect_state->row_out[i]);
if (row_energy[i] > row_energy[best_row]) {
best_row = i;
} }
col_energy[i] = teletone_goertzel_result (&dtmf_detect_state->col_out[i]); col_energy[i] = teletone_goertzel_result (&dtmf_detect_state->col_out[i]);
if (col_energy[i] > col_energy[best_col]) { if (col_energy[i] > col_energy[best_col]) {
best_col = i; best_col = i;
} }
} }
hit = 0; hit = 0;
/* Basic signal level test and the twist test */ /* Basic signal level test and the twist test */
if (row_energy[best_row] >= DTMF_THRESHOLD && if (row_energy[best_row] >= DTMF_THRESHOLD &&
col_energy[best_col] >= DTMF_THRESHOLD && col_energy[best_col] >= DTMF_THRESHOLD &&
col_energy[best_col] < row_energy[best_row]*DTMF_REVERSE_TWIST && col_energy[best_col] < row_energy[best_row]*DTMF_REVERSE_TWIST &&
col_energy[best_col]*DTMF_NORMAL_TWIST > row_energy[best_row]) { col_energy[best_col]*DTMF_NORMAL_TWIST > row_energy[best_row]) {
/* Relative peak test */ /* Relative peak test */
for (i = 0; i < GRID_FACTOR; i++) { for (i = 0; i < GRID_FACTOR; i++) {
if ((i != best_col && col_energy[i]*DTMF_RELATIVE_PEAK_COL > col_energy[best_col]) || if ((i != best_col && col_energy[i]*DTMF_RELATIVE_PEAK_COL > col_energy[best_col]) ||
(i != best_row && row_energy[i]*DTMF_RELATIVE_PEAK_ROW > row_energy[best_row])) { (i != best_row && row_energy[i]*DTMF_RELATIVE_PEAK_ROW > row_energy[best_row])) {
break; break;
} }
} }
/* ... and second harmonic test */ /* ... and second harmonic test */
if (i >= GRID_FACTOR && (row_energy[best_row] + col_energy[best_col]) > 42.0*dtmf_detect_state->energy && if (i >= GRID_FACTOR && (row_energy[best_row] + col_energy[best_col]) > 42.0*dtmf_detect_state->energy &&
teletone_goertzel_result (&dtmf_detect_state->col_out2nd[best_col])*DTMF_2ND_HARMONIC_COL < col_energy[best_col] && teletone_goertzel_result (&dtmf_detect_state->col_out2nd[best_col])*DTMF_2ND_HARMONIC_COL < col_energy[best_col] &&
teletone_goertzel_result (&dtmf_detect_state->row_out2nd[best_row])*DTMF_2ND_HARMONIC_ROW < row_energy[best_row]) { teletone_goertzel_result (&dtmf_detect_state->row_out2nd[best_row])*DTMF_2ND_HARMONIC_ROW < row_energy[best_row]) {
hit = dtmf_positions[(best_row << 2) + best_col]; hit = dtmf_positions[(best_row << 2) + best_col];
/* Look for two successive similar results */ /* Look for two successive similar results */
/* The logic in the next test is: /* The logic in the next test is:
We need two successive identical clean detects, with We need two successive identical clean detects, with
something different preceeding it. This can work with something different preceeding it. This can work with
back to back differing digits. More importantly, it back to back differing digits. More importantly, it
can work with nasty phones that give a very wobbly start can work with nasty phones that give a very wobbly start
to a digit. */ to a digit. */
if (hit == dtmf_detect_state->hit3 && dtmf_detect_state->hit3 != dtmf_detect_state->hit2) { if (hit == dtmf_detect_state->hit3 && dtmf_detect_state->hit3 != dtmf_detect_state->hit2) {
dtmf_detect_state->mhit = hit; dtmf_detect_state->mhit = hit;
dtmf_detect_state->digit_hits[(best_row << 2) + best_col]++; dtmf_detect_state->digit_hits[(best_row << 2) + best_col]++;
dtmf_detect_state->detected_digits++; dtmf_detect_state->detected_digits++;
@ -399,26 +399,26 @@ int teletone_dtmf_detect (teletone_dtmf_detect_state_t *dtmf_detect_state,
dtmf_detect_state->lost_digits++; dtmf_detect_state->lost_digits++;
} }
} }
} }
} }
dtmf_detect_state->hit1 = dtmf_detect_state->hit2; dtmf_detect_state->hit1 = dtmf_detect_state->hit2;
dtmf_detect_state->hit2 = dtmf_detect_state->hit3; dtmf_detect_state->hit2 = dtmf_detect_state->hit3;
dtmf_detect_state->hit3 = hit; dtmf_detect_state->hit3 = hit;
/* Reinitialise the detector for the next block */ /* Reinitialise the detector for the next block */
for (i = 0; i < GRID_FACTOR; i++) { for (i = 0; i < GRID_FACTOR; i++) {
goertzel_init (&dtmf_detect_state->row_out[i], &dtmf_detect_row[i]); goertzel_init (&dtmf_detect_state->row_out[i], &dtmf_detect_row[i]);
goertzel_init (&dtmf_detect_state->col_out[i], &dtmf_detect_col[i]); goertzel_init (&dtmf_detect_state->col_out[i], &dtmf_detect_col[i]);
goertzel_init (&dtmf_detect_state->row_out2nd[i], &dtmf_detect_row_2nd[i]); goertzel_init (&dtmf_detect_state->row_out2nd[i], &dtmf_detect_row_2nd[i]);
goertzel_init (&dtmf_detect_state->col_out2nd[i], &dtmf_detect_col_2nd[i]); goertzel_init (&dtmf_detect_state->col_out2nd[i], &dtmf_detect_col_2nd[i]);
} }
dtmf_detect_state->energy = 0.0; dtmf_detect_state->energy = 0.0;
dtmf_detect_state->current_sample = 0; dtmf_detect_state->current_sample = 0;
} }
if ((!dtmf_detect_state->mhit) || (dtmf_detect_state->mhit != hit)) { if ((!dtmf_detect_state->mhit) || (dtmf_detect_state->mhit != hit)) {
dtmf_detect_state->mhit = 0; dtmf_detect_state->mhit = 0;
return(0); return(0);
} }
return (hit); return (hit);
} }
@ -426,16 +426,16 @@ int teletone_dtmf_get (teletone_dtmf_detect_state_t *dtmf_detect_state,
char *buf, char *buf,
int max) int max)
{ {
if (max > dtmf_detect_state->current_digits) { if (max > dtmf_detect_state->current_digits) {
max = dtmf_detect_state->current_digits; max = dtmf_detect_state->current_digits;
} }
if (max > 0) { if (max > 0) {
memcpy (buf, dtmf_detect_state->digits, max); memcpy (buf, dtmf_detect_state->digits, max);
memmove (dtmf_detect_state->digits, dtmf_detect_state->digits + max, dtmf_detect_state->current_digits - max); memmove (dtmf_detect_state->digits, dtmf_detect_state->digits + max, dtmf_detect_state->current_digits - max);
dtmf_detect_state->current_digits -= max; dtmf_detect_state->current_digits -= max;
} }
buf[max] = '\0'; buf[max] = '\0';
return max; return max;
} }
/* For Emacs: /* For Emacs:

4
libs/openzap/src/libteletone_generate.c
View File

@ -33,7 +33,7 @@
* Exception: * Exception:
* The author hereby grants the use of this source code under the * The author hereby grants the use of this source code under the
* following license if and only if the source code is distributed * following license if and only if the source code is distributed
* as part of the openzap library. Any use or distribution of this * as part of the openzap library. Any use or distribution of this
* source code outside the scope of the openzap library will nullify the * source code outside the scope of the openzap library will nullify the
* following license and reinact the MPL 1.1 as stated above. * following license and reinact the MPL 1.1 as stated above.
* *
@ -59,7 +59,7 @@
* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
* "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
* LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
* A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER
* OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, * OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
* EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, * EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
* PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR * PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR