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Posts by klaberte

You wrote that your phone might be  "doing some sort of cross encoding" and that "the bit rate of a channel is determined by that channels S/N ratio".  Regarding the second statement, no, the SNR provides a theoretical upper bound in capacity (measured in th b/s).     I was responding to these theories you were making.  I think I understood just fine what you wrote, but perhaps not what you meant.  :-)   Welcome to head-fi!
I have done a lot of testing on a lot of different headsets, as well as talked to designers at etymotic.  You take a huge SNR penalty for not having the mic close to the mouth.  In quiet environments, putting the mic near your ear, or on one of the wires that hang down on earbuds can work.  But introduce some background noise, and it becomes hopeless.  Check out these demo:   http://www.youtube.com/watch?v=Eprf0ki0JxM http://www.youtube.com/watch?v=LtjEbE-csAY   My...
 I do not think the bitrate of the bluetooth codec varies in real time with the SNR (which determines the maximum theoretical bitrate).  I understand your observation, but I don't think it is correct.  If you think A2DP codecs dynamically change their bitrate based on RF conditions, please point me to your reference. Cheers!
There are a lot of moving parts here, so it would be hard to answer with any certainty.     The fact that some of your 128 kbps files sound better on the speaker (over the bluetooth hop) than the 256 kbps is probably not due to SNR.  I assume that you can put your phone essentially on the bluetooth receiver, and you should have plenty of bandwidth.   My guess is that your bluetooth receiver, for some reason, is not accepting your 256 kbps files in their native format,...
Firstly, this isn't really an introduction.  I've been around since 2005.   I work as an electrical engineer, but I have had stints as a semi-professional musician and sound engineer.  I also consider myself a recovering audiophile.  I take pride in owning solid, but not overpriced, gear.  My last contribution here was my review of the Microsonic custom ear tips:  http://www.head-fi.org/t/564067/review-etymotic-custom-fit-the-new-earmolds-by-microsonic   I am now...
[I tried this in another forum, but got no interest.  If this belongs elsewhere, please let me know.]     I apologize if this is a FAQ; honestly I did search for a while....   I would like to learn more about basic acoustics of earmolds, and the effects of adding dampers and ports.  I have tried some basic experiments with knowles dampers and drilling ports, but I really don't know what I'm doing.   My specific issue today is a custom silicone earmold for...
I apologize if this is a FAQ; honestly I did search for a while....   I would like to learn more about basic acoustics of earmolds, and the effects of adding dampers and ports.  I have tried some basic experiments with knowles dampers and drilling ports, but I really don't know what I'm doing.   My specific issue today is a custom silicone earmold for my bluetooth headset.  The headset was not designed to have such a tight acoustic seal, and so it is both loud...
I have a pair of Ety 6i with Custom-Fit tips. I find that the tips just keep coming off the headsets.  The tip provider (Microsonic) has made a few replacement tips, but usually within weeks, they pop off too.    To give you an example, take the 6i's out of a pouch, one of the tips will have come off and still be in the pouch.   Perhaps the 6i's are not ideal candidates for the Custom-Fit Tips.  There really isn't much on the IEM to grab onto.    Have you,...
I recently posted a review of my experience with microsonic.   http://www.head-fi.org/forum/thread/564067/review-etymotic-custom-fit-the-new-earmolds-by-microsonic   Feel free to contact me with questions.
  Some Thoughts on Microsonic Custom Tips for Etymotic Headphones As has been discussed in these forums, Etymotic has created a cost-effective path for custom in-ear monitors: http://www.etymotic.com/customfit/index.html First, a few word about me and my goals.   I work as an electrical engineer, but I have had stints as a semi-professional musician and sound engineer.  I also consider myself a recovering audiophile.  I take pride in owning solid, but not...
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