Raise v17 training time tolerance, as found in iaxmodem supplied spandsp.
---
src/v17rx.c | 8 ++++----
1 file changed, 4 insertions(+), 4 deletions(-)
Index: spandsp-3.0.0.g15/src/v17rx.c
===================================================================
--- spandsp-3.0.0.g15.orig/src/v17rx.c
+++ spandsp-3.0.0.g15/src/v17rx.c
@@ -1064,10 +1064,10 @@ static void process_half_baud(v17_rx_sta
s->carrier_track_i = 100.0f;
s->carrier_track_p = 500000.0f;
#endif
- /* TODO: This was increased by a factor of 10 after studying real world failures.
- However, it is not clear why this is an improvement, If something gives
- a huge training error, surely it shouldn't decode too well? */
- if (s->training_error < (V17_TRAINING_SHORT_SEG_2_LEN - 8)*FP_SCALE(4.0f)*FP_SCALE(1.0f)*constellation_spacing[s->space_map])
+ /* We need to be liberally accepting of poor fast-train training errors here.
+ Doing this affords the DTE the opportunity to make some use of whatever
+ valid Phase C data can be decoded. */
+ if (s->training_error < (V17_TRAINING_SHORT_SEG_2_LEN - 8)*FP_SCALE(10.0f)*FP_SCALE(1.0f)*constellation_spacing[s->space_map])
{
s->training_count = 0;
if (s->bits_per_symbol == 2)