Re: [codec] #7: Providing DTMF Testing Tools and Samples
"codec issue tracker" <trac@tools.ietf.org> Sat, 10 April 2010 05:40 UTC
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Subject: Re: [codec] #7: Providing DTMF Testing Tools and Samples
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#7: Providing DTMF Testing Tools and Samples ------------------------------------+--------------------------------------- Reporter: hoene@… | Owner: Type: task | Status: new Priority: minor | Milestone: Component: requirements | Version: Severity: Active WG Document | Keywords: ------------------------------------+--------------------------------------- Comment(by hoene@…): [Raymond]: We can use real-world recorded DTMF signals if we want to, but we don’t have to. Yes, in our DTMF testing of BV16 we used a DTMF generator software to generate the waveform of 20,000 random DTMF symbols for each of 24 DTMF test conditions, for a total of nearly half a million DTMF symbols. After passing through the codec, the DTMF signals were passed through a PC executable program which simulated a DTMF decoder that was widely deployed in commercial VoIP applications. The decoded DTMF symbols were then compared with the original DTMF keys used to generate the symbols to calculate the error rates. As you can see, such a test method is purely based on software and can easily be duplicated by third parties. If the codec WG decides not to do anything with DTMF, then obviously nothing further needs to be done, but if the WG decides that the codec candidate needs to be tested for DTMF pass-through, I will try to dig up our DTMF test software package and get internal approval to donate it to IETF for this purpose. -- Ticket URL: <http://trac.tools.ietf.org/wg/codec/trac/ticket/7#comment:3> codec <http://tools.ietf.org/codec/>
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