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LanScape VOIP Media Engine™ - Technical Support
 LanScape Support Forum -> LanScape VOIP Media Engine™ - Technical Support
Subject Topic: False DTMF detection Post ReplyPost New Topic
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DMcManus
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Joined: October 18 2007
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Posts: 11
Posted: July 18 2008 at 10:50am | IP Logged Quote DMcManus

We are experiencing a large number of false DTMF detects using DtmfDecoderWrite() when the party at the other end is speaking and we are looking for touch tones at the same time. The audio we are feedind the function is the 8kHz PCM straight from the Rx IVR channel.

We are using version 5.12.8.5 and have set the DtmfDecoderSetMinimumDigitOnTime() to 100 msec. Anything higher than that and we would start to lose short TTs. Any suggestions? Thanks.
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support
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Joined: January 26 2005
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Posted: July 18 2008 at 1:34pm | IP Logged Quote support

Hi Dennis,

Its something simple - for sure.

We will need to get a sample file of the raw samples you are feeding to your DTMF decoder blocks.

Please upload to your support FTP account a sample file containing all the DTMF tones you want to detect or individual sample files of all DTMF tones.

We will look at the DTMF signals and give you settings you can apply for signal threshold, twist, minimum digit ON time, etc that will be optimal for your DTMF detection.


Support

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DMcManus
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Joined: October 18 2007
Location: United States
Posts: 11
Posted: July 18 2008 at 3:54pm | IP Logged Quote DMcManus

Hi Support...

Thanks for getting back to me. I expect to be in a position go create the requested sample file some time on Monday and will get back to you then.

Dennis
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support
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Posted: July 18 2008 at 3:59pm | IP Logged Quote support

Thanks Dennis. We will look for you then.

Have a good weekend.

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support
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Posted: July 31 2008 at 1:20pm | IP Logged Quote support

Hi Dennis,

Did you ever resolve the in-bane DTMF detection issue you were having. We have not heard from you so we were curious.

Support

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