Hi Even Andre, The EC was reported to work well with SDK 3.x but not with SDK 4.x (regardless of the iOS version --> you can help trying to verify this by compiling with SDK 3.2 and running it on iOS 4.1). Just FYI, the iphone audio driver source that you mentioned was also written before SDK and iOS 4.x came out. Feel free to test and experiment with it and let us know if you manage to get some progress, it will definitely be of tremendous help to us and others experiencing the same problem. Currently we are working on the video feature and hopefully we can revisit the EC issue once we are done (also because by that time, iOS 4.x should have already been more widely used). Here's the bug report ticket number: 117944557 Best regards, Ming On Wed, Sep 29, 2010 at 5:02 PM, Even Andr? Fiskvik <eaf at oyatel.no> wrote: > Tested with iOS 4.1 and there is still echo when using speaker on iPhone 3GS. > I searched a bit on Voice Processing I/O Audio and there seems to be mixed results (more with problems than not). > Some stated that the EC works when programmed in a special matter ( > > I would think that EC on the iOS itself is not the problem since the EC works when using the built-in phone. > Also the Skype app works really well on speaker (but they might do some EC server-side?). > > I really hope we can make EC work in some way or another, and if it's really an iOS problem, get some attention to have it fixed by Apple. > > Ming: You mentioned a bug report filed to apple, do you have the radar link for the ticket? > I would recommend others to file bug reports as well to get some attention if it actually is > Apple's fault (and if not, there should for sure be some improvements to the documentation for Voice Processing). > > > There's some statements in the source code about how to get EC working in this source-code (search for "properly provide echo cancellation"), > someone with isights on the pjsip coreaudio driver could perhaps understand it better than me to see if it's implemented correctly; > http://code.google.com/p/pjsip-iphone-audio-driver/source/browse/trunk/iphonesound.c?r=19&spec=svn19 > > > Best regards, > Even Andr?
