Hi John,
Again, thanks for writing. Questions and comments always make me think harder 
because I often realize that I didn't state my question/problem accurately.
You have a good point regarding gating. This is often evident to hearing aid 
users if settings are too abrupt (expansion seems to work better than gating 
for minimizing some noise).
In my case, I use recorded speech and noise stimuli in research. Hearing-loss 
and cochlear implant simulators are often used so that I can use normal-hearing 
listeners as research participants. The stimuli may sound natural to 
normal-hearing listeners. There's often the problem of conditioned 
listening/hearing (sound design for movies depends on this) versus critical 
listening. We "expect" things to sound a certain way. In the case of my 
auralized (better stated as processed) recordings, the artifacts aren't 
heard--at least not to the normal ear. But if somethng is peculiar about the 
recording (such as is the case of mp3 files--this relies on psychoacoustics, 
too), then we can't say it replicates "real-world" listening even if it sounds 
good or is very hi-fi. Actual recordings with a Soundfield mic don't present 
the curious artifact. Creating the physical reconstruction of a wave field at 
the listener's head is ideal--and why I got started on Ambisonics.
 My IR-processed recordings sound ok--so long as they're played from the 
beginning of the file. But the artifact clearly indicates there's something 
very unnatural about the stimuli. Although it can be ignored by normal-hearing 
persons, I have no idea how the hearing-impaired (to include central auditory 
processing, not just sensorineural loss) might perceive the wav files--even 
when played from the start.
Anyway, everyone's input is always welcome. I hope my previous note and this 
post help clarify my question/concern. I'm still learning--and this means 
learning to formulate questions in understandable ways. I'm very appreciative 
of people's time and expertise.
Thanks and Happy Holidays,
Eric



________________________________
 From: John Abram <johnbab...@gmail.com>
To: Eric Carmichel <e...@elcaudio.com>; Surround Sound discussion group 
<sursound@music.vt.edu> 
Sent: Saturday, December 15, 2012 6:50 AM
Subject: Re: [Sursound] Ghost in Machine
 
Perhaps I'm misunderstanding, but this sounds completely normal to me.
The artifacts are simply side effects of starting playback of recorded
speech from the middle of a word. Is this situation going to present
itself to a person using a hearing aid? I mean does the device itself
act as a noise gate?

-- 
with best wishes, John
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