Echo cancelling

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When calling other people from my ADP1, there's a fair bit of long-delay 
echo, which is pretty annoying. Most other telephone solutions solve this by 
adaptive echo cancellation (you can ge far with relatively simple DSP 
techniques), but Sipdroid seems to have no code for this -- thus this 
feature request.

Original issue reported on code.google.com by sgunder...@bigfoot.com on 6 Aug 2009 at 10:34

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FWIW, this should be a "feature request", not a "Defect", but I have no idea 
how to 
change that.

Original comment by sgunder...@bigfoot.com on 6 Aug 2009 at 10:34

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Give more details please. Who is hearing the echo? Sipdroid has echo cancelling 
for 
speakerphone.

Original comment by pmerl...@googlemail.com on 6 Aug 2009 at 10:53

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We were two ADP1 users calling each other; none of us were using speakerphone. 
I heard 
my own echo, and he heard his own echo. We didn't hear each other's echo.

Why is echo cancelling only enabled for speakerphone?

Original comment by sgunder...@bigfoot.com on 7 Aug 2009 at 6:56

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Strange, the people I called from my ADP1 did not hear their echo (and I did 
not 
either). You can try lowering the volume on your ADP1.

Original comment by pmerl...@googlemail.com on 7 Aug 2009 at 11:05

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The volume was already far enough down, really -- much lower and it would have 
been 
difficult hearing the other party.

What are the parameters for the echo cancellation (filter length etc.); where 
in the 
code can I find that?

Original comment by sgunder...@bigfoot.com on 7 Aug 2009 at 10:16

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The code is in RtpStreamSender (after record.read). Did you have any other 
audio link 
between the two ADP1, like standing in the same room or similar?

Original comment by pmerl...@googlemail.com on 8 Aug 2009 at 6:28

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(Sorry for not responding earlier, I didn't notice the comments.)

No, the ADP1s were several kilometers away from each other.

It's not unique to the combination of two G1s either: I've ordered POTS 
breakout via a 
company called Phonzo, and it works fine via pbxes.org (or rather, it works 
fine 
outgoing -- incoming not yet), but the other end was complaining about hearing 
echo of 
herself.

Original comment by sgunder...@bigfoot.com on 23 Aug 2009 at 6:23

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For what it's worth, I also experience this problem. The person I talk to can 
hear an
echo of herself. I use a G1, and the other part uses an ordinary mobile phone or
land-bound phone. I also use Phonzo via pbxes.org which works great (both 
incoming
and outgoing)

Original comment by rickyn...@gmail.com on 31 Aug 2009 at 10:26

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rickynils: How do you get incoming to work with Phonzo and pbxes.org? I can't 
get it 
to work at all -- just busy signal when someone tries to call me...

FWIW, I've tried enabling speakerphone, and it actually _reduces_ the echo 
compared to 
normal talking.

Original comment by sgunder...@bigfoot.com on 31 Aug 2009 at 10:35

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I used my HTC Hero to talk to another IP phone. The voice on my phone is 
perfect, 
but there is echo on the IP phone.
The echo will be gone if I mute on HTC. I think the TX gain from HTC is too 
loud, 
lower the RX gain on HTC does not help. Anyway to lower the TX gain?

Original comment by tommy.ht...@gmail.com on 30 Nov 2009 at 9:48

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Issue 214 has been merged into this issue.

Original comment by pmerl...@googlemail.com on 30 Nov 2009 at 10:10

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The parties I call also experience a strong and extremely annoying echo. I set
microphone and earpiece to low to minimize echo but people I call are still
complaining of echo. 
Any progress on that matter?

Original comment by christia...@gmail.com on 8 Mar 2010 at 8:24

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Will you ever fix that honestly? Your app is without 
this fix just unusable cause remote party will 
always keep complaining about his own echo. 
Please do something

Original comment by christia...@gmail.com on 15 May 2010 at 9:44

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My fix is to just turn down the volume on the earpiece.  If there was a better, 
more 
technically involved way of doing echo cancellation, I would really appreciate 
it.  
Please forgive the demanding tone of the previous post.  Most of us realize 
this is a 
community project run by people who donate their time and talent.  Thank you!

Original comment by jamiehof...@gmail.com on 15 May 2010 at 12:34

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Yup, Sorry from me too. Just a bad day. My 
apologies.

Original comment by christia...@gmail.com on 15 May 2010 at 2:22

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People I call (calling a PSTN user via SIP) hear significant echo.

Original comment by nickurak on 1 Jun 2010 at 5:04

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Interesting links:

Open Source Echo Canceller Part 2 - How Echo Cancellers Work
http://www.rowetel.com/blog/?p=21

Open Source Line Echo Canceller (OSLEC)
http://www.rowetel.com/ucasterisk/oslec.html

Original comment by pablog.u...@gmail.com on 19 Jul 2010 at 12:16

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This is a significant issue for the Serval BatPhone (true P2P mesh mobile 
telephony - see servalproject.org for details).  Whenever we have tried to 
demonstrate our phones in speaker-phone mode, e.g., for filming the audio very 
rapidly degrades to near-static due to feedback from the uncancelled echo. See 
the following video for two brief examples at ~50sec and ~1:10 of this:

http://www.youtube.com/user/PaulGardnerStephen#p/a/f/1/K819ggBvkU0

Fortunately I know and live close to David Rowe (or rowetel.com).  I will have 
a chat to him about the feasibility of getting OSLEC into SIPDroid.

We also have some other patches on the way for allowing SIPDroid to talk to a 
local instance of Asterisk on the phone (currently SIPDroid complains that 
there is no data connection, and refuses, or worse, tries, but does not allow 
any codecs).

Paul

Original comment by paul.gar...@gmail.com on 23 Jul 2010 at 10:13

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Issue 574 has been merged into this issue.

Original comment by pmerl...@googlemail.com on 28 Jul 2010 at 8:20

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Paul,
Speex has pretty decent AEC, and that's what SIPDroid tries to use. I'm 
fighting with the same issue right now and I should say the problem here is 
that Android has no real-time audio support. Speaker-to-Mic delay varies a lot, 
even during a call. And this destroys AEC. I don't think OSLEC may help.

Original comment by alexander.chemeris on 5 Aug 2010 at 10:29

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This issue is NOT due to the echo cancelling features on the SAMUNG GALAXY S. 
It's due to audio playing over the external (rear) speaker instead of the 
earpiece.

Hope this is fixed soon!

Original comment by longmad on 13 Aug 2010 at 2:18

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I'd like to point out that this is still a problem. I strongly urge that echo 
cancellation is incorporated, otherwise the program's main function is almost 
unusable.  

Original comment by tdfo...@gmail.com on 30 Aug 2010 at 4:26

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I am indeed noticing echo problems on the other end. Using SIPDroid with PBXes 
tied to Gizmo5 (being routed through Google Voice).

Original comment by kni...@gmail.com on 3 Sep 2010 at 2:44

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Same for me using sipdroid and pbxes on a samsung i5500: i don't hear any noise 
or echo but on the other phone it's very loud!

Original comment by woland...@gmail.com on 15 Sep 2010 at 12:24

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Oh, I should probably mention that I'm using a Droid Incredible with SkyRaider 
2.5.2

Original comment by kni...@gmail.com on 15 Sep 2010 at 1:40

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I have a similar problem than the original reporter: I am using a Samsung 
Galaxy S (or a Nexus One sometimes) with SipDroid using pbxes and VoipCheap for 
outgoing, I call a landline and I hear my voice back after about 1s delay. It 
is the same for Wifi and 3G also.

Original comment by r...@dlux.hu on 21 Sep 2010 at 4:47

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I am not an android developer. I also have a samsung galaxy s from T-mobile. I 
have the Firmware version - 2.1-update1. I am experiencing the same problem 
with my phone. The person at the other end is not able to hear me because of 
very bad echo problem. Whereas, I am able to hear them loud and clear. I have 
added a rubber case for the phone. It seems that the case also adds to the 
problem (Not quite sure). Will this be because of a software problem or hard 
ware ? It would be great if some one could help me out. I have to plan 
accordingly to return the device incase if it is a hardware problem.

Original comment by rahul.su...@gmail.com on 28 Sep 2010 at 3:26

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I have a similar problem !

Equipment used:
Samsung Galaxy S
Sipdiscount.co.uk
Calling from Greece to Sweden

When I am using Siemens C475IP for the same call
i do not get any complains, I guess the problem must be related to SIPDROID
or the HW used.
I guess my Siemens phone have hardware solutions for noise and echo 
cancellation.
I have tried some other sip clients for Android and they all show the same 
problem.

Original comment by je.johan...@gmail.com on 30 Sep 2010 at 7:40

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Hi all,

I am having echo trouble too, but only for the party I call with Sipdroid.
I tried with and without the headphones: there is no change, the echo is there.
I was using it over wifi and without any vpn.
SIP provider: netappel.fr
Device: Samsung Galaxy I5500

many thanks,
rosch

Original comment by lucas...@gmail.com on 2 Oct 2010 at 9:10

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I heard myself with Samsung Galaxy S I9000 (International) when using some of 
the low bitrate codecs. PCMA / PCMU (64 kbit) worked fine. We used PBX inside 
the WIFI router's network.

Original comment by DGunchev on 19 Oct 2010 at 6:24

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I have a similar problem too. i don't hear any noise or echo but on the other 
phone it's very loud.

Device : Samsung Galaxy S
SIP Provider : Gizmo5
Network : WLAN

Original comment by caglaroz...@gmail.com on 26 Oct 2010 at 4:06

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since the upgrade to 1.6.1 (from some 1.5.x version) i've no more problems with 
echo.

Motorola Milestone
Android 2.1

Original comment by globifro...@gmail.com on 4 Nov 2010 at 12:01

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Well, remote party still has massive echo with 1.6.1 for me - htc magic android 
2.2

Original comment by christia...@gmail.com on 4 Nov 2010 at 8:32

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We just tested echo cancellation using SipDroid, CSipSimple, and LinPhone on an 
HTC Desire. SipDroid seems to use a squelching mechanism now which often just 
squelches both sides. The other two apps work better (Speex 8-bit, volume one 
below the maximum) but either the volume is too low or the feedback echo/noise 
is too high.

Original comment by blon...@gmail.com on 5 Nov 2010 at 7:20

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I have the same problem and it makes the app unusable for me

Original comment by kur...@gmail.com on 6 Nov 2010 at 8:30

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I can confirm the problematic echo reported by all those I call with SipDroid 
1.6.1 on an HTC Wildfire (even when using headsets), using phonzo via 
pbxes.org. 

Original comment by alanssol...@gmail.com on 7 Nov 2010 at 8:41

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I have a problem concerning echo, the person I call or the person which calls 
me gets back everything he/she says. I've tried other sip clients too but I 
want to stay with Sipdroid, and the problem occurs with every other client 
anyway. I have a Samsung Galaxy S international i9000 with Android 2.2. If I 
connect a headset or just headphones and use the internal microphone, the echo 
is gone. So the problem seems to be between the internal mic and speakers. I 
tried to set both mic and speakers to min volume, but that does not help 
anything. Any hints on how to solve this issue?

Original comment by make...@gmail.com on 8 Nov 2010 at 8:49

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I have a galaxy s and I have this annoyng problem too

Original comment by angelo.b...@gmail.com on 8 Nov 2010 at 11:19

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me too the same problem samsung galaxy s, other person hears echo

came on guys so many complaints and no solution yet

Original comment by josip.ra...@gmail.com on 11 Nov 2010 at 8:55

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Hi, same problem with zte blade

Original comment by luis...@gmail.com on 12 Nov 2010 at 10:54

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Hello,

I have addressed the problem with my Samsung Galaxy S i9000 by testing out 
CSipSimple, where you can set earpiece and mic gain manually in 0.1+- steps, 
and I was able to solve the echo problem by just setting the gain to the 
minimum available setting. So I request at the developers of Sipdroid, please, 
could you add an advanced option for setting the mic/earpiece manually, because 
it seems the Sipdroid minimum profile of 'Low' is not low enough for the i9000 
for reducing the echo.

Original comment by make...@gmail.com on 20 Nov 2010 at 5:14

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In my opinion the echo cancellation should be handled by the hardware (and it 
is actually done when using the devices as actual phones). 
The resources required to do software echo cancellations are generally to much 
for current devices. Skype is the only application that does it, but it takes 
about 90% of the processor on my older T-mobile myTouch 3G. Nothing left for 
video.

Original comment by ddrago...@gmail.com on 30 Nov 2010 at 2:45

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Hi,

I am using Samsung Galaxy S and I am very disappointed with SIP applications 
available on Android market. I have tried all the SIP applications available on 
the market including SIPDroid, CSimSimple, Nimbuz, Fring etc.

I have been a big fan of Android OS. As VOIP/SIP is very commonly used feature 
in smartphones these days, I would have imagined that either Samsung or Android 
app maker would have performed some tests on this.

My old Nokia gives way better results than Android driven smartphone.

Any kind of help or guidance in this regard would be greatly appreciated.

Thanks

Original comment by patelhar...@gmail.com on 7 Dec 2010 at 12:27

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CSipSimple in version 0.0.0-15 has added a microphone / loudspeaker sensitivity 
setting. With low settings there is no echo on the other end of the line. I 
think this would be the solution for the echo problem for sipdroid as well. 

Please add this to sipdroid. 

Original comment by felixloe...@gmail.com on 7 Dec 2010 at 9:41

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felixloesch8, on Sipdroid, there already are mic and speaker gain settings - 
just go on   Settings > Audio/Video.
The problem is that if you put them low, then you need to shout at the mic, and 
compress the earpiece against your head to be able to communicate.

Original comment by BigRi...@gmail.com on 7 Dec 2010 at 9:46

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To patelhardik8090: you may try my "SMS Video" and "ddPhoneVideo" :-)

To felixloesch8: yes, the amplification levels impact the echo. Half-duplex is 
another possible less processor intensive solution ( reduce the level of the 
mic input when the speaker volume is high...) 
But the thing is that all phones have echo canceling built in: that is how they 
work well in speaker mode. My question is why is this not enabled by default or 
by simply setting a flag in code? 

Original comment by ddrago...@gmail.com on 7 Dec 2010 at 12:59

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Samsung Galaxy I9000. The same problem as above

Original comment by zshi...@gmail.com on 8 Dec 2010 at 11:29

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Here's a good writeup on echo and echo 
cancellation:http://www.linuxjournal.com/article/8424?page=0,0

Original comment by k...@laberteaux.org on 15 Dec 2010 at 7:33

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HTC Incredible, 2.2, sipdroid up to date, same problem.  Thanks for the awsome 
program and keep up the good work!

Original comment by danp...@gmail.com on 19 Dec 2010 at 6:02