Preston_PLB/freeswitch
1
0
Fork 0
forked from Mirrors/freeswitch
Code Pull Requests Activity

Further changes to polish the long training/short training issues that spoilt

Browse Source 
T.38 gateway operation with some FAX machines
This commit is contained in:
Steve Underwood 2010-06-16 23:26:15 +08:00
parent 2a1a3867d1
commit eed8ea1b82
2 changed files with 6 additions and 10 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

2
libs/spandsp/src/t38_gateway.c
View File

@ -1627,6 +1627,7 @@ static void non_ecm_rx_status(void *user_data, int status)
s->audio.modems.rx_trained = TRUE;
s->core.timed_mode = TIMED_MODE_IDLE;
s->core.samples_to_timeout = 0;
s->core.short_train = TRUE;
to_t38_buffer_init(&s->core.to_t38);
break;
case SIG_STATUS_CARRIER_UP:
@ -1792,6 +1793,7 @@ static void hdlc_rx_status(hdlc_rx_state_t *t, int status)
/* The modem is now trained. */
s->audio.modems.rx_signal_present = TRUE;
s->audio.modems.rx_trained = TRUE;
s->core.short_train = TRUE;
/* Behave like HDLC preamble has been announced. */
t->framing_ok_announced = TRUE;
to_t38_buffer_init(&s->core.to_t38);

14
libs/spandsp/src/v17rx.c
View File

@ -1358,12 +1358,12 @@ SPAN_DECLARE(int) v17_rx_restart(v17_rx_state_t *s, int bit_rate, int short_trai
s->carrier_phase_rate = dds_phase_ratef(CARRIER_NOMINAL_FREQ);
equalizer_reset(s);
#if defined(SPANDSP_USE_FIXED_POINTx)
//s->agc_scaling_save = 0;
s->agc_scaling_save = 0;
s->agc_scaling = (float) FP_FACTOR*32768.0f*0.0017f/RX_PULSESHAPER_GAIN;
s->carrier_track_i = 5000;
s->carrier_track_p = 40000;
#else
//s->agc_scaling_save = 0.0f;
s->agc_scaling_save = 0.0f;
s->agc_scaling = 0.0017f/RX_PULSESHAPER_GAIN;
s->carrier_track_i = 5000.0f;
s->carrier_track_p = 40000.0f;
@ -1371,6 +1371,7 @@ SPAN_DECLARE(int) v17_rx_restart(v17_rx_state_t *s, int bit_rate, int short_trai
}
s->last_sample = 0;
span_log(&s->logging, SPAN_LOG_FLOW, "Phase rates %f %f\n", dds_frequencyf(s->carrier_phase_rate), dds_frequencyf(s->carrier_phase_rate_save));
span_log(&s->logging, SPAN_LOG_FLOW, "Gains %f %f\n", s->agc_scaling_save, s->agc_scaling);
/* Initialise the working data for symbol timing synchronisation */
#if defined(SPANDSP_USE_FIXED_POINTx)
@ -1407,7 +1408,7 @@ SPAN_DECLARE(v17_rx_state_t *) v17_rx_init(v17_rx_state_t *s, int bit_rate, put_
case 9600:
case 7200:
case 4800:
/* 4800 is an extension of V.17, to provide full converage of the V.32bis modes */
/* 4800 is an extension of V.17, to provide full coverage of the V.32bis modes */
break;
default:
return NULL;
@ -1425,13 +1426,6 @@ SPAN_DECLARE(v17_rx_state_t *) v17_rx_init(v17_rx_state_t *s, int bit_rate, put_
s->short_train = FALSE;
//s->scrambler_tap = 18 - 1;
v17_rx_signal_cutoff(s, -45.5f);
#if defined(SPANDSP_USE_FIXED_POINTx)
s->agc_scaling_save = 0;
s->agc_scaling = (float) FP_FACTOR*32768.0f*0.0017f/RX_PULSESHAPER_GAIN;
#else
s->agc_scaling_save = 0.0f;
s->agc_scaling = 0.0017f/RX_PULSESHAPER_GAIN;
#endif
s->carrier_phase_rate_save = dds_phase_ratef(CARRIER_NOMINAL_FREQ);
v17_rx_restart(s, bit_rate, s->short_train);
return s;