Jan Engelhardt
d265faaa42
OBS-URL: https://build.opensuse.org/package/show/network:telephony/spandsp?expand=0&rev=41
26 lines
1.4 KiB
Diff
26 lines
1.4 KiB
Diff
Raise v17 training time tolerance, as found in iaxmodem supplied spandsp.
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---
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src/v17rx.c | 8 ++++----
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1 file changed, 4 insertions(+), 4 deletions(-)
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Index: spandsp-3.0.0.g15/src/v17rx.c
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===================================================================
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--- spandsp-3.0.0.g15.orig/src/v17rx.c
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+++ spandsp-3.0.0.g15/src/v17rx.c
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@@ -1064,10 +1064,10 @@ static void process_half_baud(v17_rx_sta
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s->carrier_track_i = 100.0f;
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s->carrier_track_p = 500000.0f;
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#endif
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- /* TODO: This was increased by a factor of 10 after studying real world failures.
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- However, it is not clear why this is an improvement, If something gives
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- a huge training error, surely it shouldn't decode too well? */
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- if (s->training_error < (V17_TRAINING_SHORT_SEG_2_LEN - 8)*FP_SCALE(4.0f)*FP_SCALE(1.0f)*constellation_spacing[s->space_map])
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+ /* We need to be liberally accepting of poor fast-train training errors here.
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+ Doing this affords the DTE the opportunity to make some use of whatever
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+ valid Phase C data can be decoded. */
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+ if (s->training_error < (V17_TRAINING_SHORT_SEG_2_LEN - 8)*FP_SCALE(10.0f)*FP_SCALE(1.0f)*constellation_spacing[s->space_map])
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{
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s->training_count = 0;
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if (s->bits_per_symbol == 2)
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