g.168 defenitions

Started by a_a_...@yahoo.com in Echo Cancellation14 years ago 1 reply

hi every body, i want to be familiar with itu-t g.168 recommendation. please introduce me the source of itu-t standards, if possible. i...

hi every body, i want to be familiar with itu-t g.168 recommendation. please introduce me the source of itu-t standards, if possible. i searched the web several times but i didnot find the definitions and terminologies about g.168 and the specification should be met according to g.168 for an echo canceller.


G.168(06/2002) testing problem

Started by bojuchen2000 in Echo Cancellation15 years ago

G.168 defines many testing requirements for EC. I extract one of them as belows. ......the combined loss (L_Rin,act-L_RET)...

G.168 defines many testing requirements for EC. I extract one of them as belows. ......the combined loss (L_Rin,act-L_RET) should be greater than or equal to that shown in Figure 10. G.168 also defines how to measure the signal level and peak in 6.4.1.2.1 and 6.4.


About G.168 and G.165Echo Cancellation Alogorithm

Started by nurn...@revesoft.com in Echo Cancellation9 years ago 1 reply

Dear Guyz, I want to implement G.168 echo Cancellation algorithm but i have not found any where the implementation instructions.please...

Dear Guyz, I want to implement G.168 echo Cancellation algorithm but i have not found any where the implementation instructions.please help me where i can get it


Composite source signals

Started by jfa47 in Echo Cancellation13 years ago 2 replies

Hi: I am trying to make a composite source signal for test a echo canceler, but i can understand a some thinks. In the G.168 are...

Hi: I am trying to make a composite source signal for test a echo canceler, but i can understand a some thinks. In the G.168 are defined the expresion for pseudo noise signal (G.168 Page 53 C.3-1), but I don't know what are the values for W(k)? Thanks in advance Jeronimo


Test Vectors Generation.

Started by d_madhu_rao in Echo Cancellation17 years ago

Hello Friends, 1)Can you please suggest me certain methods for generating the Test Vectors of G.168 standard. 2) What are...

Hello Friends, 1)Can you please suggest me certain methods for generating the Test Vectors of G.168 standard. 2) What are Hoth noise and Comfort Noise and how can they be generated? 3)I would like to download the testvectors of G.168 and so can u plea


Info regarding G.168

Started by Techie Dsp in Echo Cancellation15 years ago 1 reply

Hi, Can I get some links where I can find exhaustive information about G.168.? Thanks in advance. Arun. ...

Hi, Can I get some links where I can find exhaustive information about G.168.? Thanks in advance. Arun. _________________________________________________________________ Looking for a soulmate? http://www.shaadi.


LEC behavoiur for music

Started by Anonymous in Echo Cancellation16 years ago

hi, what is the behaviour of G.168 LEC for music signals(i mean songs in far end)? Where can i get information about this? ...

hi, what is the behaviour of G.168 LEC for music signals(i mean songs in far end)? Where can i get information about this? regds, jagadees


Power Measurement Device

Started by d_madhu_rao in Echo Cancellation17 years ago

Hello Friends, Here I am with a doubt which I would like to clarify from you. What is the detector - indicator unit in the...

Hello Friends, Here I am with a doubt which I would like to clarify from you. What is the detector - indicator unit in the power measurement device as indicated in 6.4.1.2.1 of ITU G.168 How to implement that in the software implementation? Sincerely


Signalling Tones

Started by Ananda Basak in Echo Cancellation17 years ago

Hi Friends, can U give me some refference for signalling system No. 5,6 & 7 as mentioned in sec 6.4.2.9 : Test no8 of G.168...

Hi Friends, can U give me some refference for signalling system No. 5,6 & 7 as mentioned in sec 6.4.2.9 : Test no8 of G.168 standard.? Actually I want to know when and how these tones are used. waiting for ur early reply. Thanks & Regards ****


Detecting tones in an EC'ed channel

Started by Steve Underwood in Echo Cancellation16 years ago

Hi all, Tones really screw up the adaption of an EC. To get through the G.168 tests there seems to be no alternative but to...

Hi all, Tones really screw up the adaption of an EC. To get through the G.168 tests there seems to be no alternative but to detect that strong narrowband energy is present in the channel, and stop adaption while it is there. There are a number of obvious strategies for doing t


Power measurement

Started by vinprakash366 in Echo Cancellation17 years ago 7 replies

Hi all, In the G.168(2000) standard, under section 6.4.1.2.1, level measurement device, i am a little confused abt the...

Hi all, In the G.168(2000) standard, under section 6.4.1.2.1, level measurement device, i am a little confused abt the detector-indicator block. How should this be implemented in order to decect the power in dBm0??. Also, is the 1-pole exponential filter mentioned in the block


Re: Training sequences in hybrid echo cancellers

Started by Maurice Givens in Echo Cancellation17 years ago

The hybrid is not connected until the connection is made when the called is off hook. Therefore, the called party would hear the...

The hybrid is not connected until the connection is made when the called is off hook. Therefore, the called party would hear the training sequence. This is considered annoying and unacceptable by the carriers. Maurice Givens (one of those G.168 authors) On


mips problem??

Started by akash damodar sureka in Echo Cancellation18 years ago 3 replies

hello everyone, i am working on echo cancellation. i have completed the g.165 and g.168 complaince echo canceller. can...

hello everyone, i am working on echo cancellation. i have completed the g.165 and g.168 complaince echo canceller. can somebody tell me how much mips does normal echo canceller takes and which algorithm. is there any technique to reduce mips in lms or block update


Number of Echo paths.

Started by Maximus Marcus in Echo Cancellation17 years ago

Hi all, I have been working G.168 and I have some doubts regarding number of echo paths. 1. How many number of (distinct)...

Hi all, I have been working G.168 and I have some doubts regarding number of echo paths. 1. How many number of (distinct) echo paths (generated from different hybrids) could be there in a 128 ms echo tail? (For a Network echo canceller) 2. According t


Reference code for G.168

Started by Anonymous in Echo Cancellation15 years ago 1 reply

Message Hi,  

Message Hi,