[optimal] Re: Spectralis
- From: Jef Jodell <mpscra@xxxxxxxxx>
- To: optimal@xxxxxxxxxxxxx
- Date: Tue, 19 Jul 2011 23:51:34 -0700 (PDT)
I have a CD (copywrite free, don't think you can copywrite that) of white
noise,
and also of "brown noise" (similar, emphasis on different frequencies I
believe,
a while since I read up on any of this, or even just wiki'ed it). Varying
between the two could eliminate the possible ear fatigue of a constant sound.
Happy to send anyone a burned copy if you like, and have means for office
playback. Emailing an MP3 may not have the full spectrum, uncertain what
changes
would occur, the reduction of bit rate my or may not change it (I don't believe
in compression of audio files, never listen to MP3s).
Contact me off line if you like. I have worked in pro audio studios 20 years
prior to photography. I am in the process of moving across the country, so it
may take me a couple weeks, but can will always help anyone w/ and audio need.
-j
________________________________
From: Tom Steele <tsteele@xxxxxxxxxxxxxx>
To: optimal@xxxxxxxxxxxxx
Sent: Tue, July 19, 2011 6:58:26 AM
Subject: [optimal] Re: Spectralis
I am wondering if white noise could take care of the problem. In the office
where my counselor works, they keep white noise generators in different
locations to drown out the voices in the office rooms. The sound is quite
pleasant as it provides for a peaceful place that I can mediate while waiting.
I
also wonder if besides this option, if wave sound generators could do the same
as white noise.
Thank You,
Tom Steele,
CRA
Midwest Eye Institute
200 West 103rd Street
Indianapolis, Indiana 46290
317.817.1018
tsteele@xxxxxxxxxxxxxx
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From:optimal-bounce@xxxxxxxxxxxxx [mailto:optimal-bounce@xxxxxxxxxxxxx] On
Behalf Of Rachel Malpica
Sent: Monday, July 18, 2011 7:14 PM
To: optimal@xxxxxxxxxxxxx
Subject: [optimal] Re: Spectralis
Hi All,
I have been using the spectralis for 6 months now. I don't notice it anymore.
I am deaf in one ear and am concerned about future problems. Should I worry.
Beth Malpica
Imaging Specialist
IOVS, UMDNJ, Newark, NJ
-----Original Message-----
From: Jef Jodell <mpscra@xxxxxxxxx>
To: optimal <optimal@xxxxxxxxxxxxx>
Sent: Sun, Jul 17, 2011 2:26 pm
Subject: [optimal] Re: Spectralis
Marshall, don't know how long you have had yours, but I got used to it pretty
quickly. However at times I would find myself turning the machine away from me
for less direct sound. Also, if your room is tiled with a sheetrock ceiling
you
will get more room reflections, increasing the dbs over a carpeted room with an
acoustic suspended ceiling. Radio Shck sell db meters for about $20 if you
really want to check out your own space.
As for neutralizing it, I assume it must be proprietary to the operation, or
they would have done away with it. That question I think is for Tim Steffens,
or
Steve Thomas.
You guys out there?
-j
PS: I have been tested and can still hear well over 14K, which for my age is
excellent, though one ear has a slight mid-range dip, which may account in part
for my ease of ignoring the sound. Somewhere around age 40 it is not uncommon
for people to lose the upper frequencies, down to around 12K, much like losing
near vision. Even a good quality car stereo only produces from about 100Hz (the
fundamental of a kick drum) to around 10KHz. When you see a movie like Jurassic
Park, and can feel the vibrations as much as hear the low stomp of giant feet,
that is close to a 20Hz wave, which we feel more than hear. You have to have a
room length in excess of 20 feet to produce such a wave, ideally longer. Many
home theatre sub-woofers only go down to about 30Hz, and if you have up set up
in a small area you won't even get that. Obviously, I love talking audio, but
I'll drop this now. Hopefully the Heidleberg guys can shed some further light
(no pun intended) on this.
________________________________
From:Marshall Tyler <mtyler@xxxxxxxxxx>
To: "prieleye@xxxxxxxxxxxxxxxx" <prieleye@xxxxxxxxxxxxxxxx>;
"optimal@xxxxxxxxxxxxx" <optimal@xxxxxxxxxxxxx>
Sent: Sun, July 17, 2011 12:51:37 PM
Subject: [optimal] Re: Spectralis
Jef, and others,
Thanks for the 4k frequency information.
How about the dbs?
Perhaps while someone is testing, what direction(s) are the loudest?
I wonder, even if the sound level is not a hearing/health issue, l personally
find the sound quite annoying as well as a fatigue problem.
I've wondered how to neutralize the "noise box".
Your thoughts,
Marshall
Note new eMail: MTyler@xxxxxxxxxxxxxxx
Sent from my Verizon Wireless Phone
----- Reply message -----
From: "Ethan Priel" <prieleye@xxxxxxxxxxxxxxxx>
Date: Sun, Jul 17, 2011 11:53 am
Subject: [optimal] Re: Spectralis
To: "optimal@xxxxxxxxxxxxx" <optimal@xxxxxxxxxxxxx>
Yes, you know your audio, and you also skirted a potentially sticky PC
issue…not
to mention the children's rights activists.
E
From: optimal-bounce@xxxxxxxxxxxxx [mailto:optimal-bounce@xxxxxxxxxxxxx] On
Behalf Of Jef Jodell
Sent: 17 July, 2011 23:49
To: optimal@xxxxxxxxxxxxx
Subject: [optimal] Re: Spectralis
The issue is both dbs and frequency. The frequency is 4000 Hertz (4Kz). Human
hearing goes from 20 H to 20Kz. We are most sensitive to 1K Hz, just as we are
most sensitive to green in light wavelengths. Human voices (male) tend to be
centered around 800-1000Hz, and easy to hear. Women's voices are slightly
higher, generally speaking, but around 4KHz is what we start to consider
"shrill", as in a child crying. You get used to it. Only repeated constant
exposure (sitting at it "on" for hours at a time) could cause any issue, and it
would take decades to cause a problem.
I know my audio.
-j
________________________________
From: "blutmancra@xxxxxxxxxxx" <blutmancra@xxxxxxxxxxx>
To: optimal@xxxxxxxxxxxxx
Sent: Sun, July 17, 2011 10:25:41 AM
Subject: [optimal] Re: Spectralis
When I started to work with heidelberg systems it was annoying but you get use
to it. Health end of it I really won't know. I figure heidelberg sells the
product is not to harm operators or patient hearing.
I guess you have to research to see if there was any complaints of hearing loss
etc. Maybe there should be a study started.
Brian Lutman,CRA
Sent from my Verizon Wireless BlackBerry
________________________________
From: Raymond Mok <raywmok@xxxxxxxxx>
Sender: optimal-bounce@xxxxxxxxxxxxx
Date: Sun, 17 Jul 2011 09:14:09 -0400
To: optimal@xxxxxxxxxxxxx<optimal@xxxxxxxxxxxxx>
ReplyTo: optimal@xxxxxxxxxxxxx
Cc: optimal@xxxxxxxxxxxxx<optimal@xxxxxxxxxxxxx>
Subject: [optimal] Re: Spectralis
Our office have just installed the Spectralis. I'd noticed the high pitched
noise but didn't bothered much. However one of the tech said as soon as we
click
the "yellow" icon, the high pitched sound gave her spitting headache. I agree
the high pitched sound is in the safety zone but does bothered some people.
Ray Mok CRA, COMT
Ophthalmic Photographer
DHMC-Ophthalmology
On Jul 16, 2011, at 8:21 PM, Ray Gardner
<raygardner99@xxxxxxxxx<mailto:raygardner99@xxxxxxxxx>> wrote:
No I've got four and about to have six in my office. The Spectralis has a sound
like that of a hearing aid whining but causes no hearing problems. Its just
annoying at first then after a while you seem not to notice it any more. The
HRA
was much loader and gave off a lot of heat. Thing of the Spectralis as the
Ferrari of cameras it has a strange sound but runs and does like no other
camera
can. If you need any help you can call me. (806) 676-9793
Sent from my iPhone
On Jul 16, 2011, at 4:06 PM, robert santora
<rbsantora@xxxxxxxxx<mailto:rbsantora@xxxxxxxxx>> wrote:
To All,
Is there any concerns about the high pitched frequency sound from the
Spectralis
causing potential harm? I have suggested discreet protective ear wear by anyone
that is uncomfortable around the sound. I was asked by our docs to start a
thread to see how other offices are addressing this. Thanks
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