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


LEC from Texas Instruments

Started by realyvirtual in Echo Cancellation15 years ago 1 reply

hi! i am trying to use LEC provided by Texas instruments packaged as an example in development kit for XDAIS complaint...

hi! i am trying to use LEC provided by Texas instruments packaged as an example in development kit for XDAIS complaint algorithms on C6711. but this algorithm appears to be not working properly. it damps the echo part just a little bit. has anyone used it.. can i


RE: Re: LEC and NEC

Started by Huo Jiaquan in Echo Cancellation15 years ago

Sorry, i have been working with acoustic echoes, not very familiar with modem designs. Could u explain 'determined through an...

Sorry, i have been working with acoustic echoes, not very familiar with modem designs. Could u explain 'determined through an exchange between the end-points during startup' in a bit more details? Or sugguest some good ref.? thx --- "Shaw, David G (Davi


(No Subject)

Started by narendra in Echo Cancellation17 years ago

Hi Dear all, I want to incorporate AGC in my LEC. Does any body has algorithm for AGC? The ITU-T G.169 states that one should...

Hi Dear all, I want to incorporate AGC in my LEC. Does any body has algorithm for AGC? The ITU-T G.169 states that one should keep AGC in there transmission path i.e. after cancellation of Echo. But as my ultimate goal is to take advantage of power calculation of AGC in


RE: acoustic echo cancellation performance?

Started by Shaw, David G David in Echo Cancellation16 years ago 1 reply

From experience you should not count on echo cancellation like you expect from the LEC numbers you may be familiar with. Measure...

From experience you should not count on echo cancellation like you expect from the LEC numbers you may be familiar with. Measure the microphone noise floor and make sure that your residual error is not dominated by it. It is VERY, VERY hard to reach 30dB from just the AEC. Issu


RE: Re: LEC and NEC

Started by Huo Jiaquan in Echo Cancellation15 years ago

The papers i read gave me the impression that the hybrids at the central offices are equipped with ECs. So they are not? Or those...

The papers i read gave me the impression that the hybrids at the central offices are equipped with ECs. So they are not? Or those ECs do not provide sufficient suppression? --- "Shaw, David G (David)" <> wrote: > I will discuss V.32, sinc


Re: Re: LEC and NEC

Started by Steve Underwood in Echo Cancellation15 years ago

Shaw, David G (David) wrote: >The network generally has ECs for voice. These are >very seldom co-located with the central...

Shaw, David G (David) wrote: >The network generally has ECs for voice. These are >very seldom co-located with the central office equipment. > The network generally does *not* have EC for voice. A phone to phone call across town is not cancelled at all. The only


LEC and NEC

Started by lee in Echo Cancellation15 years ago 6 replies

Can someone tell me what the difference is between a Line Echo Canceller and a Network Echo Canceller? To me, it seems that the only...

Can someone tell me what the difference is between a Line Echo Canceller and a Network Echo Canceller? To me, it seems that the only difference is the echo path delay. Or say, they are just different echo paths. If that's right, then a echo canceller with, say, 128ms delay sho


discriminating double talk and echo path change

Started by solv_78 in Echo Cancellation17 years ago

Hi, Is echo path change a common problem in LEC. Is there any standard way of discriminating this with double talk. How adequate ...

Hi, Is echo path change a common problem in LEC. Is there any standard way of discriminating this with double talk. How adequate are methods which depend on the variance of the input signal for discrimination, particularly since tones send from one end can confuse such discrimi