Voice Audio Transfer AEC ECHO cancellation

[Turan Can 3]

Hi All,

 

My only problem is AEC. I couldn't find much information.

 

I'm dealing with voice transfer, I did everything. I have a problem. As the two sides begin to speak, voices begin to mingle. As I understand it, it echoes. Is there a code example that clears it?
Or "AEC Echo Cancellation" in a sdk. may be in paid product.

 

[Ugochukwu Mmaduekwe 42]

3 minutes ago, Turan Can said:

Hi All,

 

My only problem is AEC. I couldn't find much information.

 

I'm dealing with voice transfer, I did everything. I have a problem. As the two sides begin to speak, voices begin to mingle. As I understand it, it echoes. Is there a code example that clears it?
Or "AEC Echo Cancellation" in a sdk. may be in paid product.

 

you did not state your platform, Android, iOS, Windows?

[Turan Can 3]

Windows VCL

[Guest]

I will list few things that might help you, as did helped me.

 

There is superb Delphi library https://github.com/lakeofsoft/vcp that the author released and discontinued its support.

If you don't want to use it, that is fine because you need one thing from there, this file unaSpeexAPI.pas has the header translation of Speex Codec with its DSP, there is another header file, but i can't find it. may be outdated a little, i can't remember.

Now you need SpeexDSP from https://www.speex.org/downloads/ which has very powerful DSP pre-processor with effective algorithms for Denoise, Auto Gain Control (AGC), Voice Activity Detection (VAD) and Acoustic Echo Canceller  (AEC) 

Compiling the SpeexDSP into DLL is simple, and using the unaSpeexDSP from that header file is all what you need, of course after having look at https://www.speex.org/docs/ for the API and how to play and capture the echo, i can't remember now the right procedure sequence (preprocess , echo_playback, echo_capture)or the right values for setting, that something i believe you can figure it out your own. 

 

And good luck.

 

ps: if you are encoding the audio/voice, i highly recommend to use Opus http://opus-codec.org/ it is the best (check the comparison and examples page), many recommendation to use SpeexDSP algorithms with Opus, as Opus still doesn't have its own, same developer.