<div dir="ltr">Before the thread dies I would like to add to this subject that there is an Open Source echo canceler exists: Oslec<div>As written on their site it already works with "<em style="font-weight:bold;font-style:normal;color:rgb(0,0,0);font-family:arial,sans-serif;line-height:16px">You</em><span style="font-family:arial,sans-serif;line-height:16px">-</span><em style="font-weight:bold;font-style:normal;color:rgb(0,0,0);font-family:arial,sans-serif;line-height:16px">Know-Who</em>"... :)<br>
<div style>Has anyone seriously considered integrating it into FreeSWITCH?</div></div></div><div class="gmail_extra"><br><br><div class="gmail_quote">2013/3/19 Sean Devoy <span dir="ltr"><<a href="mailto:sdevoy@bizfocused.com" target="_blank">sdevoy@bizfocused.com</a>></span><br>
<blockquote class="gmail_quote" style="margin:0 0 0 .8ex;border-left:1px #ccc solid;padding-left:1ex"><div lang="EN-US" link="blue" vlink="purple"><div><p class="MsoNormal"><span style="font-family:"Verdana","sans-serif";color:#1f497d">Anthony and Spencer,<u></u><u></u></span></p>
<p class="MsoNormal"><span style="font-family:"Verdana","sans-serif";color:#1f497d"><u></u> <u></u></span></p><p class="MsoNormal"><span style="font-family:"Verdana","sans-serif";color:#1f497d">Thanks for your responses. Anthony the megaphone analogy really worked for me. Spencer thanks for saving me the time of looking up those settings.<u></u><u></u></span></p>
<p class="MsoNormal"><span style="font-family:"Verdana","sans-serif";color:#1f497d"><u></u> <u></u></span></p><p class="MsoNormal"><span style="font-family:"Verdana","sans-serif";color:#1f497d">I agree cell phones frequently have huge echo. The longer the echo delay (aka higher latency) the harder it is to correct makes perfect sense as well.<u></u><u></u></span></p>
<p class="MsoNormal"><span style="font-family:"Verdana","sans-serif";color:#1f497d"><u></u> <u></u></span></p><p class="MsoNormal"><span style="font-family:"Verdana","sans-serif";color:#1f497d">I actually had a chance to talk to one of the users experiencing this problem. Bear in mind I usually get to talk to her boss who is looking for reasons to not pay his bill. She said they do still “occasionally” get echo but it is not too bad. She said it is always worse when the call certain people (that correlate’s with end user device problems). Then she mentioned I was one of the ones they usually get echo with and it was happening now, but not that bad!<u></u><u></u></span></p>
<p class="MsoNormal"><span style="font-family:"Verdana","sans-serif";color:#1f497d"><u></u> <u></u></span></p><p class="MsoNormal"><span style="font-family:"Verdana","sans-serif";color:#1f497d">Opportunity knocked, so I jumped in! First a quick note of reference – I have moderately high hearing loss and wear hearing aids. I keep my headset turned up fairly high! I asked the user who called me to talk to herself while I did some tests and tell me if the echo got better or even went away. Low and Behold – mute made it go away COMPLETELY. As much as I hate it when Anthony is right, it is hard to deny it. I tested further and each of these things helped enough that she noticed: Turning my headset speaker down on the inline volume control, turning the headset speaker down at the phone, turning my microphone boost down (this headset has 3 settings for microphone level), muting at the phone or on the inline headset control. All of those things taken collectively say “Listen to Anthony butthead.”<u></u><u></u></span></p>
<p class="MsoNormal"><span style="font-family:"Verdana","sans-serif";color:#1f497d"><u></u> <u></u></span></p><p class="MsoNormal"><span style="font-family:"Verdana","sans-serif";color:#1f497d">So, assuming the cause of the echo is beyond my control (e.g. someone else’s phone) are we just screwed or is it just cost prohibitive? I would rather reply that it would cost $5000 to fix it than say “can’t be helped.”<u></u><u></u></span></p>
<p class="MsoNormal"><span style="font-family:"Verdana","sans-serif";color:#1f497d"><u></u> <u></u></span></p><p class="MsoNormal"><span style="font-family:"Verdana","sans-serif";color:#1f497d">Suppose the user detects bad echo. Is there anything we could do (assuming they could notify FS through a programmable key or even web link, etc)? Could we drop the gain to and from the remote end?<u></u><u></u></span></p>
<p class="MsoNormal"><span style="font-family:"Verdana","sans-serif";color:#1f497d"><u></u> <u></u></span></p><p class="MsoNormal"><span style="font-family:"Verdana","sans-serif";color:#1f497d">I promise to let this die now. Let me here your final thoughts.<u></u><u></u></span></p>
<p class="MsoNormal"><span style="font-family:"Verdana","sans-serif";color:#1f497d"><u></u> <u></u></span></p><p class="MsoNormal"><span style="font-family:"Verdana","sans-serif";color:#1f497d">Thanks again for your time and patience.<u></u><u></u></span></p>
<p class="MsoNormal"><span style="font-family:"Verdana","sans-serif";color:#1f497d"><u></u> <u></u></span></p><div><div style="border:none;border-top:solid #b5c4df 1.0pt;padding:3.0pt 0in 0in 0in"><p class="MsoNormal">
<b><span style="font-size:10.0pt;font-family:"Tahoma","sans-serif"">From:</span></b><span style="font-size:10.0pt;font-family:"Tahoma","sans-serif""> <a href="mailto:freeswitch-users-bounces@lists.freeswitch.org" target="_blank">freeswitch-users-bounces@lists.freeswitch.org</a> [mailto:<a href="mailto:freeswitch-users-bounces@lists.freeswitch.org" target="_blank">freeswitch-users-bounces@lists.freeswitch.org</a>] <b>On Behalf Of </b>Spencer Thomason<br>
<b>Sent:</b> Tuesday, March 19, 2013 11:40 AM</span></p><div><div class="h5"><br><b>To:</b> FreeSWITCH Users Help<br><b>Subject:</b> Re: [Freeswitch-users] Removing echo.<u></u><u></u></div></div><p></p></div></div><div><div class="h5">
<p class="MsoNormal"><u></u> <u></u></p><p class="MsoNormal">Hi Sean,<u></u><u></u></p><div><p class="MsoNormal">We were experiencing a similar problem with these units and were able to verify that it was in fact the remote end but the threshold of the echo canceler seems to be too low by default. We could hear echo and then unplug the handset from the base on the other end, without muting, and the echo would stop. We found that decreasing the gain slightly all but eliminated complaints. This does reduce the level slightly but in our traces it was close to on par with an analog handset. The pertinent configuration options are:<u></u><u></u></p>
</div><div><p class="MsoNormal"><u></u> <u></u></p></div><div><p class="MsoNormal"> <Handset_Input_Gain>-6</Handset_Input_Gain><br> <Headset_Input_Gain>-6</Headset_Input_Gain><br> <Speakerphone_Input_Gain>-6</Speakerphone_Input_Gain><br>
<Handset_Additional_Input_Gain>0</Handset_Additional_Input_Gain><br> <Headset_Additional_Input_Gain>0</Headset_Additional_Input_Gain><br> <Speakerphone_Additional_Input_Gain>0</Speakerphone_Additional_Input_Gain><u></u><u></u></p>
</div><div><p class="MsoNormal"><u></u> <u></u></p></div><div><p class="MsoNormal">Thanks,<u></u><u></u></p></div><div><p class="MsoNormal">Spencer<u></u><u></u></p></div><div><p class="MsoNormal"><u></u> <u></u></p></div>
<div><p class="MsoNormal"><u></u> <u></u></p><div><div><p class="MsoNormal">On Mar 19, 2013, at 7:49 AM, Anthony Minessale wrote:<u></u><u></u></p></div><p class="MsoNormal"><br><br><u></u><u></u></p><div><p class="MsoNormal">
Sean,<u></u><u></u></p><div><p class="MsoNormal"><u></u> <u></u></p></div><div><p class="MsoNormal">You are welcome to disagree. Science is driven by people being unwilling to accept things as they are.<u></u><u></u></p>
</div><div><p class="MsoNormal">I do have some explanations for you if you are interested.<u></u><u></u></p></div><div><p class="MsoNormal"><u></u> <u></u></p></div><div><p class="MsoNormal">Cisco and Linksys ATA both have echo cancelers in them at the point where the analog data is converted to digital. This is the ideal place for it as I mentioned earlier. So they actually are doing something about the problem and that is why you do not observe one. Getting echo while using a cell phone is also very common. The more latency and conversion of the audio data you experience, the more likely you can have echo. (iPhone is notorious) The other place where its important to have echo cancellation is the point where the digital data in the rtp stream is transferred into the TDM gateway interfacing with the PSTN. This is why most TDM cards like Digium and Sangoma have onboard echo canceler chips. We are not completely helpless, we can do some unnatural things like decode the audio signal we are passing through and try to run some echo cancellation on it but, in the conditions you describe where you hear a perfect replica of what you are saying 2-5 seconds later only softer. That is for sure outside the range of any echo canceler. It cannot reliably tell that this clean signal coming many seconds later should be filtered out because its a replica of data that has already passed by long before. Usually in this type of issue, you are actually hearing the other side hear what you said. So you say the statement, the latency takes its toll and the echo is coming back at you from the far end as they are hearing it. <u></u><u></u></p>
</div><div><p class="MsoNormal"><u></u> <u></u></p></div><div><p class="MsoNormal">I am open to options. We do have some work on doing some inline audio processing underway but we should not rely on them if we can possibly control the surroundings better first. If you are talking to me in the same room using a megaphone and I am wearing ear plugs. Its easier to tell you to turn off the megaphone and tell me to remove the ear plugs.<u></u><u></u></p>
</div><div><p class="MsoNormal"><u></u> <u></u></p></div><div><p class="MsoNormal"><u></u> <u></u></p></div><div><p class="MsoNormal"><u></u> <u></u></p></div></div><div><p class="MsoNormal" style="margin-bottom:12.0pt"><u></u> <u></u></p>
<div><p class="MsoNormal">On Mon, Mar 18, 2013 at 9:24 PM, Sean Devoy <<a href="mailto:sdevoy@bizfocused.com" target="_blank">sdevoy@bizfocused.com</a>> wrote:<u></u><u></u></p><div><div><p class="MsoNormal"><span style="font-family:"Verdana","sans-serif";color:#1f497d">Hey Anthony,</span><u></u><u></u></p>
<p class="MsoNormal"><span style="font-family:"Verdana","sans-serif";color:#1f497d"> </span><u></u><u></u></p><p class="MsoNormal"><span style="font-family:"Verdana","sans-serif";color:#1f497d">Does that mean PBXMate is not worth investigating?</span><u></u><u></u></p>
<p class="MsoNormal"><span style="font-family:"Verdana","sans-serif";color:#1f497d"> </span><u></u><u></u></p><p class="MsoNormal"><span style="font-family:"Verdana","sans-serif";color:#1f497d">I have to disagree here. Placing the blame entirely on the phones at the other end doesn’t hold water for me. I have had echo problems calling from my cell phone when leaving a voice mail on FS where there is no phone at the other end. So clearly there are situations where it ain’t just the phone at the other end. It also leaves no explanation why Cisco Phones and Linksys ATAs don’t have the same problem with Commercial Venders like Vonage. They don’t have anything different at the end of the line for echo cancellation then FS does. I have also had users confirm they are still getting echo with the microphone MUTED on my end.</span><u></u><u></u></p>
<p class="MsoNormal"><span style="font-family:"Verdana","sans-serif";color:#1f497d"> </span><u></u><u></u></p><p class="MsoNormal"><span style="font-family:"Verdana","sans-serif";color:#1f497d">Again, I love FS and I am not trying to bash anyone or any code. I am just saying there has to be more to this puzzle. I know what a crappy speaker phone’s echo sounds like and I am not at all concerned about that. Crappy speaker phones sound like crappy speaker phones no matter what. I don’t think that’s what I am trying to track down. These are business call where 90% are using the standard handset on business quality phones. It happens at various levels, but when it is at the bad end of the spectrum (e.g. long delay and loud), it does not sound like echo off of walls coming back in a microphone. It is like my input channel has been delayed, softened and looped directly back to me crystal clear. Maybe it is one of my VOIP providers’ hardware or software and is load dependent, but the problem exists outside of cheap phones. And of course it is only reproducible on 3 calls in a hundred at peak usage hours, making it a nightmare to track or diagnose. But those 3 calls are the ones my customers want to talk about at billing time.</span><u></u><u></u></p>
<p class="MsoNormal"><span style="font-family:"Verdana","sans-serif";color:#1f497d"> </span><u></u><u></u></p><p class="MsoNormal"><span style="font-family:"Verdana","sans-serif";color:#1f497d">Now, I have just thrown that all out there is hopes that 50 people will say “That absolutely never happens to me with FS” so I can look at it a different way.</span><u></u><u></u></p>
<p class="MsoNormal"><span style="font-family:"Verdana","sans-serif";color:#1f497d"> </span><u></u><u></u></p><p class="MsoNormal"><span style="font-family:"Verdana","sans-serif";color:#1f497d">Thanks for your thoughts.</span><u></u><u></u></p>
<p class="MsoNormal"><span style="font-family:"Verdana","sans-serif";color:#1f497d">Sean</span><u></u><u></u></p><p class="MsoNormal"><span style="font-family:"Verdana","sans-serif";color:#1f497d"> </span><u></u><u></u></p>
<p class="MsoNormal"><b><span style="font-size:10.0pt;font-family:"Tahoma","sans-serif"">From:</span></b><span style="font-size:10.0pt;font-family:"Tahoma","sans-serif""> <a href="mailto:freeswitch-users-bounces@lists.freeswitch.org" target="_blank">freeswitch-users-bounces@lists.freeswitch.org</a> [mailto:<a href="mailto:freeswitch-users-bounces@lists.freeswitch.org" target="_blank">freeswitch-users-bounces@lists.freeswitch.org</a>] <b>On Behalf Of </b>Anthony Minessale<br>
<b>Sent:</b> Monday, March 18, 2013 7:30 PM</span><u></u><u></u></p><div><p class="MsoNormal"><br><b>To:</b> FreeSWITCH Users Help<br><b>Subject:</b> Re: [Freeswitch-users] Removing echo.<u></u><u></u></p></div><div><p class="MsoNormal">
<u></u> <u></u></p></div><p class="MsoNormal"> <u></u><u></u></p><div><p class="MsoNormal">The best place for echo cancelation is in the clients as close to the mic as possible.<u></u><u></u></p><div><div><div><p class="MsoNormal">
Someone asked why skype and some apps are better. It's because they have echo cans in the client app.<u></u><u></u></p></div><div><p class="MsoNormal">Sip soft phones are basically toys unless they have some kind of advanced gain and echo controls on your pc because that is where your mic is and could have the vol turned up too high etc.<u></u><u></u></p>
</div><div><p class="MsoNormal"> <u></u><u></u></p></div><div><p class="MsoNormal">From FS perspective in the middle, we can't tell its echo or not because we are just passing the data along and we're typically getting it 30-70 ms too late. <u></u><u></u></p>
</div><div><p class="MsoNormal"> <u></u><u></u></p></div><div><p class="MsoNormal"> <u></u><u></u></p></div><div><p class="MsoNormal">In general, you don't get echo when using real phones because they have proper hardware and software to deal with the place where the audio is being sampled and rendered.<u></u><u></u></p>
</div><div><p class="MsoNormal"> <u></u><u></u></p></div><div><p class="MsoNormal"> <u></u><u></u></p></div><div><p class="MsoNormal"> <u></u><u></u></p></div><div><p class="MsoNormal"> <u></u><u></u></p></div></div></div>
</div><div><div><div><p class="MsoNormal" style="margin-bottom:12.0pt"> <u></u><u></u></p><div><p class="MsoNormal">On Mon, Mar 18, 2013 at 5:15 PM, Christopher Rienzo <<a href="mailto:cmrienzo@gmail.com" target="_blank">cmrienzo@gmail.com</a>> wrote:<u></u><u></u></p>
<p class="MsoNormal">Echo cancellation is not easy. The only open source one I've seen is GPL (making it license incompatible with FreeSWITCH) and is not suitable for handling echo over IP networks. Perhaps tricks are being played using VAD to only allow only one speaker at a time in the ooVoo conference?<u></u><u></u></p>
<div><div><p class="MsoNormal" style="margin-bottom:12.0pt"><u></u> <u></u></p><div><p class="MsoNormal">On Mon, Mar 18, 2013 at 5:53 PM, Mimiko <<a href="mailto:vbvbrj@gmail.com" target="_blank">vbvbrj@gmail.com</a>> wrote:<u></u><u></u></p>
<p class="MsoNormal">Today we tried ooVoo conference system with theirs client using same<br>boxes and microphones - again, no echo. How this can be? Is it only<br>commercial products have echo removing function?<u></u><u></u></p>
<div><div><p class="MsoNormal"><br>--<br>Mimiko desu.<br><br>_________________________________________________________________________<br>Professional FreeSWITCH Consulting Services:<br><a href="mailto:consulting@freeswitch.org" target="_blank">consulting@freeswitch.org</a><br>
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-- <br>Anthony Minessale II<br><br>FreeSWITCH <a href="http://www.freeswitch.org/" target="_blank">http://www.freeswitch.org/</a><br>ClueCon <a href="http://www.cluecon.com/" target="_blank">http://www.cluecon.com/</a><br>
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<a href="http://www.cluecon.com" target="_blank">http://www.cluecon.com</a><br><br>FreeSWITCH-users mailing list<br><a href="mailto:FreeSWITCH-users@lists.freeswitch.org" target="_blank">FreeSWITCH-users@lists.freeswitch.org</a><br>
<a href="http://lists.freeswitch.org/mailman/listinfo/freeswitch-users" target="_blank">http://lists.freeswitch.org/mailman/listinfo/freeswitch-users</a><br>UNSUBSCRIBE:<a href="http://lists.freeswitch.org/mailman/options/freeswitch-users" target="_blank">http://lists.freeswitch.org/mailman/options/freeswitch-users</a><br>
<a href="http://www.freeswitch.org" target="_blank">http://www.freeswitch.org</a><u></u><u></u></p></div><p class="MsoNormal"><u></u> <u></u></p></div></div></div></div></div><br>_________________________________________________________________________<br>
Professional FreeSWITCH Consulting Services:<br>
<a href="mailto:consulting@freeswitch.org">consulting@freeswitch.org</a><br>
<a href="http://www.freeswitchsolutions.com" target="_blank">http://www.freeswitchsolutions.com</a><br>
<br>
FreeSWITCH-powered IP PBX: The CudaTel Communication Server<br>
<a href="http://www.cudatel.com" target="_blank">http://www.cudatel.com</a><br>
<br>
Official FreeSWITCH Sites<br>
<a href="http://www.freeswitch.org" target="_blank">http://www.freeswitch.org</a><br>
<a href="http://wiki.freeswitch.org" target="_blank">http://wiki.freeswitch.org</a><br>
<a href="http://www.cluecon.com" target="_blank">http://www.cluecon.com</a><br>
<br>
FreeSWITCH-users mailing list<br>
<a href="mailto:FreeSWITCH-users@lists.freeswitch.org">FreeSWITCH-users@lists.freeswitch.org</a><br>
<a href="http://lists.freeswitch.org/mailman/listinfo/freeswitch-users" target="_blank">http://lists.freeswitch.org/mailman/listinfo/freeswitch-users</a><br>
UNSUBSCRIBE:<a href="http://lists.freeswitch.org/mailman/options/freeswitch-users" target="_blank">http://lists.freeswitch.org/mailman/options/freeswitch-users</a><br>
<a href="http://www.freeswitch.org" target="_blank">http://www.freeswitch.org</a><br>
<br></blockquote></div><br></div>