DTMF in G.729

Started by Bob Tausworthe in Speech Coding20 years ago 3 replies

I am reading a spec that states that G.729 is capable of conveying DTMF. Is this correct? I would have thought that G.711 would be...

I am reading a spec that states that G.729 is capable of conveying DTMF. Is this correct? I would have thought that G.711 would be required to accurately code DTMF. thanks in advance Bob Tausworthe


DTMF detection on a GSM AMR bitstream

Started by e_voice61 in Speech Coding17 years ago 2 replies

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...

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


RE: DTMF Decoder

Started by Hocquet Franck in Speech Coding18 years ago

Hi Shahram, As I experienced implementation of very well working DTMF in TI C54x, you can try the following algorithm, which is...

Hi Shahram, As I experienced implementation of very well working DTMF in TI C54x, you can try the following algorithm, which is a part of my decoder. I have it in assembler if you are interested : ;The accumulation of each filter output is endangered by a possible


DTMF Detection

Started by Shehryar Amir in Speech Coding18 years ago 3 replies

Dear All, I am new to this group. I want to implement DTMF Detection algorithm in C/C++. I have read some material on web...

Dear All, I am new to this group. I want to implement DTMF Detection algorithm in C/C++. I have read some material on web and have chosen to start with NonUniform Discrete Fourier Transform i:e Goertzel Algoritm. How can I meet the ITU-T specifiaction ? How can I choose


ANSI specs for DTMF detector

Started by manoj garg in Speech Coding18 years ago

Dear sir, I am searching for the ANSI specifications for the DTMF detector. Could you please tell me where i can get them. ...

Dear sir, I am searching for the ANSI specifications for the DTMF detector. Could you please tell me where i can get them. Are thes specs different from ITU-T AT&T values. How much they diifer? regards manoj


Second Harmincs in speech signal

Started by manoj garg in Speech Coding18 years ago 1 reply

Hello friends, I wanted to know that what is the ratio of second harmonic energy to the fundamental frequency energy in the...

Hello friends, I wanted to know that what is the ratio of second harmonic energy to the fundamental frequency energy in the speech signal. Actually i am implementing a DTMF detector and to discriminate the DTMF signal from the speech i have to put this check.


RE: DTMF Decoder

Started by shahram heidari in Speech Coding18 years ago

Hi Franck Thank you so much for your response. I will appreciate if you send me some part of your code about following ...

Hi Franck Thank you so much for your response. I will appreciate if you send me some part of your code about following topics, if it is possible for you, and also answer me: 1. It is used multiplying factor (1/8) while the number of sample is 16, x(n),...x(n+15).


DTMF Detction

Started by Shehryar Amir in Speech Coding18 years ago

Hi Thanx for your replies. I have gone through a good Article found on web. It says that no single value of "N" can meet...

Hi Thanx for your replies. I have gone through a good Article found on web. It says that no single value of "N" can meet the ITU-T specs and also gave reason for this. That why two values are needed. It has taken N= 106 (13.3msec) for high group and N =212 for


VAD/CNG module for GIPS ILBC

Started by navithak in Speech Coding13 years ago 1 reply

Hi, I have implemented Gips ILBC codec on adsp 2185..However I am unable to find any information on the vad/dtx module..Is that royalty...

Hi, I have implemented Gips ILBC codec on adsp 2185..However I am unable to find any information on the vad/dtx module..Is that royalty free as well?? Where can I obtain it?Any information will be greatly appreciated Another question..Does ilbc pass dtmf tone?? regards Navitha


G.711 and G.729a tone detection

Started by Nalin K Pithwa in Speech Coding18 years ago

would G.711u law and G.729a tone detection require any special test equipment just as DTMF tone detection ( like the Bellcore and ...

would G.711u law and G.729a tone detection require any special test equipment just as DTMF tone detection ( like the Bellcore and MITEL tests) ? Regards, NP


Voice Codecs Algorithms for Pentiums

Started by Mayank Kumar in Speech Coding17 years ago

Hi All, I am involved in a Computer Telephony project and I am looking for Voice Codec algorithms like G.711 (A law and...

Hi All, I am involved in a Computer Telephony project and I am looking for Voice Codec algorithms like G.711 (A law and Ulaw), G.726, G.723.1, G.729a/b, DTMF Generation/Detection, CNG (Comfort Noise Generation), Echo Cancellation, Voice Activity Detection,etc Coded in C