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Discussion Groups | Speech Coding | DTMF detection on a GSM AMR bitstream
Technical discussions related to Speech Coding (all itu and other vocoders, ACELP, CELP, AMR, etc)
DTMF detection on a GSM AMR bitstream - e_voice61 - Jun 29 7:19:00 2003
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Hi all, Do anyone know of a way to detect DTMF on a GSM AMR bitstream without fully decoding it? I will be happy to know if you can do it on ITU-T voice codecs as well (G.723.1, G.728, G.729). Thanks |
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Re: DTMF detection on a GSM AMR bitstream - Nicolas Bougues - Jun 29 19:52:00 2003
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On Sun, Jun 29, 2003 at 07:19:02AM -0000, e_voice61 wrote: > Hi all, > > Do anyone know of a way to detect DTMF on a GSM AMR bitstream without > fully decoding it? > I will be happy to know if you can do it on ITU-T voice codecs as > well (G.723.1, G.728, G.729). These codecs are optimized for voice. They are not able to carry DTMF tones reliably. So even with a full decode, you won't be able to detect them. They have to be transmitted out-of-band. -- Nicolas Bougues Axialys Interactive |
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Re: DTMF detection on a GSM AMR bitstream - Author Unknown - Jul 1 2:31:00 2003
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G.728 will pass DTMF tones with perfect results as theory predicts and both lab and field testing have validated. The same is true for at least Annex E of G.729. And as you said, G.723.1 will unfortunately not pass DTMF at either rate. Chuck In a message dated 6/29/2003 2:52:06 PM Eastern Standard Time, writes: > > On Sun, Jun 29, 2003 at 07:19:02AM -0000, e_voice61 wrote: > > Hi all, > > > > Do anyone know of a way to detect DTMF on a GSM AMR bitstream without > > fully decoding it? > > I will be happy to know if you can do it on ITU-T voice codecs as > > well (G.723.1, G.728, G.729). > > > > These codecs are optimized for voice. They are not able to carry DTMF > tones reliably. So even with a full decode, you won't be able to > detect them. > > They have to be transmitted out-of-band. > -- > Nicolas Bougues > Axialys Interactive > > _____________________________________ |
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