Stefan Knoblich 5367b96153 ftmod_isdn: Rework teletone buffer offset handling in isdn_tones_run(). ...

Store the offset in the teletone buffer in the b-channel private data.

An NT-mode setup with ftmod_misdn showed severe (dial-)tone distortions
in a sound editor (330Hz sine wave phase errors), caused by
using a global teletone buffer offset.

Switching to a per-channel offset, that is advanced by the amount
of data actually written to the channel, removes (almost) all
distortions.

There is still a minimal phase error every ~500ms (audible) that
needs more investigating.

Signed-off-by: Stefan Knoblich <stkn@openisdn.net>

2012-07-26 01:21:47 +02:00

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ftmod_isdn.2008.vcproj

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ftmod_isdn.2010.vcxproj

VS2010 Initial version for freetdm

2010-11-29 21:55:34 -06:00

ftmod_isdn.2010.vcxproj.filters

VS2010 Initial version for freetdm

2010-11-29 21:55:34 -06:00

ftmod_isdn.c

ftmod_isdn: Rework teletone buffer offset handling in isdn_tones_run().

2012-07-26 01:21:47 +02:00

ftmod_isdn.h

ftmod_isdn: Rework teletone buffer offset handling in isdn_tones_run().

2012-07-26 01:21:47 +02:00