[Freeswitch-users] FSClient Release - A FreeSWITCH SIP Client for Windows in .NET

[Jmesquita@freeswitch.org]

Steve, the reason why I was developing FSComm is purely out of passion for development. That passion includes me using the software I produce afterwards. As you might have imagined, I use a Mac. I have complained a lot about all the software that claim to be multi platform and that do a lousy job using the features that to me are basic on a soft phone. That includes using it on a speaker on a Mac which is one of the most widely used features for business guys with Skype. Most probably it relates closely to it's success.

That feature has stopped me from using regular soft phones for a long time now on any my devices and being stuck with hard phones just because i cant manage to be attached to the Mac with a corded headset. Granted, there are bluetooth options that i could have bought and i chose not to.

That being said, I have researched for AEC for quite some time now and even though i am don't consider myself too much of a lame tech guy, implementing the theory I have found is not up to my knowledge and thats is precisely why i reached out to the community.

I don't believe we need an AEC technology that is absolutely insanely great like what Skype does, my goal is to find one technology/implementation that does a good job on a small office room. I couldn't get that with the speexdsp which most certainly points that i probably don't know hoe to use it properly.

Sorry for the long reply, but i thought the subject needed it.

Regards,

JM

Sent from my iPad

On Feb 6, 2011, at 11:56 AM, Steve Underwood <steveu at coppice.org> wrote:

> On 02/02/2011 09:48 PM, João Mesquita wrote:
>> Mitch, you beat me to it...
>> 
>> I think it might be time for me to get back to FSComm and drop being 
>> picky about the AEC thing? Sad but true, I think that the only way for 
>> me to draw attention of someone who knows about this stuff is actually 
>> doing the rest like you did. Great initiative. I truly congratulate 
>> you from pulling something I couldn't so far.
>> 
> I am puzzled why the AEC issue would ever have affected your development 
> of FSComm. Although a headset or handset needs EC for really good 
> telephone, the lack fo AEC is only a killer for speakerphone usage.
> 
> On this topic, a little experimentation suggests the following...
> 
> Skype appears to do good AEC on a PC, but when you listen carefully is 
> seems more like they avoid proper AEC, and use the kind of adaptive gain 
> juggling the DSP Group pushed heavily in the early 90s. The final result 
> is very acceptable, though, and avoids the problems to non-matching mic 
> and speaker sampling rates that you get with many PC sound cards.
> 
> Skype on a Symbian handset and a Mac seems to do proper echo 
> cancellation, and gives results a bit better than on a PC. The limited 
> range of hardware used in these platforms makes AEC more of a practical 
> option.
> 
> If anyone has further information about the exact schemes used by Skype, 
> I would really like to hear from them. Skype is used on so many 
> machines, that whatever strategy they have found workable across a wide 
> range of hardware should be a safe bet for us to use.
> 
> Steve
> 
> 
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