AEC | Double Talk | ERLE | G.168 | LEC | NLMS

Hello Muk, Everybody gets to read something in some paper doc .... right ??? I just wanted to know which paper it is ...... !!!! Regarding your query for Subband-nLMS ...you can search www.researchindex.com for papers. Peak search methods vary by algorithm implementation ...........one can use ....... * Correlation * BandStop Filtering * Demodulation to DC (0 Hz).....etc...... Although no paper gives you exact theory or implementation aspects for PEAK SEARCH Methods for usage in ECHO CANCELLATION. you have to do a little bit of R&D work .....trying to implement various algos as suggested above and you choose the best method for your application .........since I do not know your end application Now for the real stuff......... You can find the peaks of any signal using CROSS-CORRELATION ....... as you have suggested. Since you suggest MATLAB Simulation........you are in Luck....... I have done this stuff ............. All you have to do is generate two signals......... 1. The REFERENSE SIGNAL ( what you call FAR-END SIGNAL ) 2. The NEAR END SIGNAL ( what you call normalised NEAR-END SIGNAL ). After this, Use 'xcorr' command to correlate the two signals ............ Just check for unusual BEHAVIOUR of the CROSS-CORRELATED Signal ........... and you have solved your problem. Regards, Dharmendra Lingaiah -----Original Message----- From: MUKUND GOPALAN [mailto:] Sent: Saturday, February 09, 2002 8:54 AM To: Subject: RE: [echocancel] Peak search doubts..... Hi, I read about peak search in a paper document. It performs a cross-correlation of far end signal and normalised near end signal to find peaks in the echo tail. It says that a peak search can be simulated in MATLAB using sliding average . Could u explain what this is or atleast direct me to links where i can learn about snlms,peak search methods and sliding averages.bye. -Mukund Dharmendra Lingaiah <> wrote: Hello Mukund, Where did you read about PEAK SEARCH in subband nLMS Algorithm ??? If you can send me this link.....Probably, I can give you some idea... since I am working on nLMS Algorithm and Echo Cancellation. Dharmendra -----Original Message----- From: gmukund_2000 [mailto:] Sent: Wednesday, February 06, 2002 10:34 PM To: Subject: [echocancel] Peak search doubts..... Hi, I was reading about the subband NLMs algo the other day.Here there was a mention of a concept called peak search. This was done to identify the peaks of the signals and hence detect the echoes. But i'm kinda lost about this concept.could u help me out here. What are the methods of performing this peak search. In a document i read that it can be done by using sliding average.could one of u explain this concept to me.I'm kinda confused about the whole thing.Pleae reply ASAP. -Mukund _____________________________________ ______________________________________________________ This email with any attachments is for the exclusive use of the intended recipient/s & may contain confidential & legally privileged information. If you are not the intended recipient pls notify the sender immediately & delete the email from your system. Any unauthorised use, disclosure, printing, dissemination, forwarding or copying of this mail is strictly prohibited and unlawful. Visit us at: http://www.cranessoftware.com Yahoo! Groups SponsorADVERTISEMENT _____________________________________ ______________________________________________________ This email with any attachments is for the exclusive use of the intended recipient/s & may contain confidential & legally privileged information. If you are not the intended recipient pls notify the sender immediately & delete the email from your system. Any unauthorised use, disclosure, printing, dissemination, forwarding or copying of this mail is strictly prohibited and unlawful. Visit us at: http://www.cranessoftware.com

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Hi, I was reading about the subband NLMs algo the other day.Here there was a mention of a concept called peak search. This was done to identify the peaks of the signals and hence detect the echoes. But i'm kinda lost about this concept.could u help me out here. What are the methods of performing this peak search. In a document i read that it can be done by using sliding average.could one of u explain this concept to me.I'm kinda confused about the whole thing.Pleae reply ASAP. -Mukund

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Hello Mukund, Where did you read about PEAK SEARCH in subband nLMS Algorithm ??? If you can send me this link.....Probably, I can give you some idea... since I am working on nLMS Algorithm and Echo Cancellation. Dharmendra -----Original Message----- From: gmukund_2000 [mailto:] Sent: Wednesday, February 06, 2002 10:34 PM To: Subject: [echocancel] Peak search doubts..... Hi, I was reading about the subband NLMs algo the other day.Here there was a mention of a concept called peak search. This was done to identify the peaks of the signals and hence detect the echoes. But i'm kinda lost about this concept.could u help me out here. What are the methods of performing this peak search. In a document i read that it can be done by using sliding average.could one of u explain this concept to me.I'm kinda confused about the whole thing.Pleae reply ASAP. -Mukund _____________________________________ ______________________________________________________ This email with any attachments is for the exclusive use of the intended recipient/s & may contain confidential & legally privileged information. If you are not the intended recipient pls notify the sender immediately & delete the email from your system. Any unauthorised use, disclosure, printing, dissemination, forwarding or copying of this mail is strictly prohibited and unlawful. Visit us at: http://www.cranessoftware.com

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Hi, I read about peak search in a paper document. It performs a cross-correlation of far end signal and normalised near end signal to find peaks in the echo tail. It says that a peak search can be simulated in MATLAB using sliding average . Could u explain what this is or atleast direct me to links where i can learn about snlms,peak search methods and sliding averages.bye. -Mukund Dharmendra Lingaiah <> wrote: Hello Mukund, Where did you read about PEAK SEARCH in subband nLMS Algorithm ??? If you can send me this link.....Probably, I can give you some idea... since I am working on nLMS Algorithm and Echo Cancellation. Dharmendra -----Original Message----- From: gmukund_2000 [mailto:] Sent: Wednesday, February 06, 2002 10:34 PM To: Subject: [echocancel] Peak search doubts..... Hi, I was reading about the subband NLMs algo the other day.Here there was a mention of a concept called peak search. This was done to identify the peaks of the signals and hence detect the echoes. But i'm kinda lost about this concept.could u help me out here. What are the methods of performing this peak search. In a document i read that it can be done by using sliding average.could one of u explain this concept to me.I'm kinda confused about the whole thing.Pleae reply ASAP. -Mukund _____________________________________ ______________________________________________________ This email with any attachments is for the exclusive use of the intended recipient/s & may contain confidential & legally privileged information. If you are not the intended recipient pls notify the sender immediately & delete the email from your system. Any unauthorised use, disclosure, printing, dissemination, forwarding or copying of this mail is strictly prohibited and unlawful. Visit us at: http://www.cranessoftware.com Yahoo! Groups SponsorADVERTISEMENT _____________________________________ Your use of Yahoo! Groups is subject to the Yahoo! Terms of Service. ---------------------------------

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Dharmendar, Muk: Check out the following TI Application Note: SPRA322 It describes an AEC using a centered adaptive filter. The adaptive filter is centered based on a delay estimate obtained by selecting the peak of a cross-correlation function. -Krishna

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