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 (Juin-Hwey) Chen wrote: > 2. Did you ever test your CODEC for other telephony signals, such as > /ANSam, ANS, CED, and CI tones? These tones are needed in order to > detect modems and fax machines and switch to an appropriate payload. > What about progress tones? > [Raymond]: No, we didn’t. However, if these are single-frequency > tones, I would expect that it should be easier for a typical codec to > pass these tones than to pass the dual-frequency DTMF signals without > causing significant degradation in the subsequent processing of these tones. This is pretty much a dead-end based on the other comments on this list, but in general, no, most of these tones are *not* single-frequency simple tones. ANSam, for example, is a single frequency, but is amplitude modulated. There are also variants that have phase reversals, and these must be preserved for them to be discriminated from the non-phase-reversal versions. -- Kevin P. Fleming -- Ticket URL: <http://trac.tools.ietf.org/wg/codec/trac/ticket/7#comment:2> codec <http://tools.ietf.org/codec/>
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