Thread: General Samsung Exhibit II 4G
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Old June 26th, 2012, 11:28 AM   #55 (permalink)
classicalmusic
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Quote:
Originally Posted by coyote1 View Post
Seems endemic to VoIP in general, and with this phone in particular.

I started with Talkatone on the iPad. Has some echo, but not terrible. Moved to the alpha-testing Talkatone for Android on the Exhibit II, and at this point all my 'victims' report significant echo on their end.

Tried muting the mic with my hand and the echo diminished a bit but not completely. The workaround is to use earphones. The echo goes away entirely.

That tells me two things:

a) The echo is acoustic, through the body of the phone. With a mic in such close proximity to a speaker, this is no surprise. Physical isolation in such a small unit while preserving audibility would be nearly impossible.

AND
b) that's why typical cellphone communication sounds non-duplexed. Clearly, the makers of the phone soft/firmware account for it by muting one side or the other depending on when you're talking. If you're not talking, your phone's OS is muting the mic. If you are talking, your phone's OS is muting the earpiece.

So I guess once Talkatone, GrooveIP, et al get the basic VoIP comm circuit working right, their next area of effort will be to work on the conditional muting.
I just bought this phone off ebay. The seller included a hard rubber case. Not sure the model. Anyway...my goal was to use Talkatone, GrooveIP, or OBION with google voice/chat to use VOIP with tmobile's $30 plan. Anway..when using ANY of the above clients I never heard echo, but person on the other end would hear significant echo. So I took the case off the phone, tried each of the services above, and the echo cleared up. When I hold the top of the phone (with out case) while talking, the caller hears echo again.

Interesting find!! I'll also have to try headset.
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