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DMcManus
Intermediate
Joined: October 18 2007
Location: United States
Posts: 11
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| Posted: July 18 2008 at 10:50am | IP Logged
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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
Administrator
Joined: January 26 2005
Location: United States
Posts: 1666
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| Posted: July 18 2008 at 1:34pm | IP Logged
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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.
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DMcManus
Intermediate
Joined: October 18 2007
Location: United States
Posts: 11
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| Posted: July 18 2008 at 3:54pm | IP Logged
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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
Administrator
Joined: January 26 2005
Location: United States
Posts: 1666
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| Posted: July 18 2008 at 3:59pm | IP Logged
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Thanks Dennis. We will look for you then.
Have a good weekend.
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support
Administrator
Joined: January 26 2005
Location: United States
Posts: 1666
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| Posted: July 31 2008 at 1:20pm | IP Logged
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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.
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LanScape Support Forum -> LanScape VOIP Media Engine™ - Technical Support
Topic: False DTMF detection
