Dear friends, I want to model an echo path in matlab. This problem is different from estimation of echo path. In fact Echo ...

Dear friends, I want to model an echo path in matlab. This problem is different from estimation of echo path. In fact Echo Estimator will adapt to this echo path. but the first thing is to implement that echo path itself. I am trying it by implementing an all pass

Hello, I have one question regarding 2, 3 or more reflections and multiple tail circuits. Is the double reflections or three...

Hello, I have one question regarding 2, 3 or more reflections and multiple tail circuits. Is the double reflections or three reflections overall can be called as single tail circuit? Or Can we consider 3 reflections as 3 small dispersive regions in a echo pat

I read about echo cancell that it can can cancell echo between 30 ms and 62 ms. These number get from the delay in Hybrid 30 ms...

I read about echo cancell that it can can cancell echo between 30 ms and 62 ms. These number get from the delay in Hybrid 30 ms (240 samples) and the tailLen 32 ms. tailLen is defined as "The length of the echo spread in the number of samples. Echo spread is also so

Hi all, I am working on the H323 VoIP terminal in the PC environment. but in order to cancel the echo from speaker even from...

Hi all, I am working on the H323 VoIP terminal in the PC environment. but in order to cancel the echo from speaker even from the headset(I am not sure if this is acoustic echo or line echo. but we do hear a faint echo intermittently, any idea? ), I need a basic acoustic echo

Hello Maximus, There are algorithms that do not rely on level differences to determine if double-talk is present. These algorithms...

Hello Maximus, There are algorithms that do not rely on level differences to determine if double-talk is present. These algorithms do not suffer from input level differences. I would suggest you do a patent search on echo canceller double-talk detectors. One detector I k

Hello Madhu, I have tried to answer your questions below ... 1. Why 4-wire system is used between Hybrid and PSNT and...

Hello Madhu, I have tried to answer your questions below ... 1. Why 4-wire system is used between Hybrid and PSNT and 2-wire system is used as subscriber loop. I believe ...the choice of 2-wire for local loop was purely a COST CONSIDERATION Factor, it worke

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

Hi friends, Can anybody tell me how to implement -Automatic Gain Control -Pre-emphasis Any help will be highly...

Hi friends, Can anybody tell me how to implement -Automatic Gain Control -Pre-emphasis Any help will be highly appreciated. Best Regards, Shiv

Hello All, Suppose I want to test if echo is induced during transmission through a network. I send a predetermined messsage from...

Hello All, Suppose I want to test if echo is induced during transmission through a network. I send a predetermined messsage from the farside and on the nearend, I compare this transmitted predetermined message (from the farend)with the original message. From there I try to detect if

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