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Author
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Topic: Soundproof Polygraph Room
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KenTennPoly
Member
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posted 11-27-2003 09:11 AM
  
I was wondering if anyone has soundproofed their polygraph room? I am building mine and was thinking that it needed to be soundproof from the external sounds. Any feedback?IP: Logged |
Ted Todd
Member
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posted 11-30-2003 05:31 PM
We are building a new polygraph lab at my office. Every effort is being made to double insulate the walls and to use solid doors. Additional material may be put on the interior walls as well. Keeping the background noise out is a very important issue in my book!Ted IP: Logged |
AD
Member
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posted 11-30-2003 07:26 PM
If finances are a consideration for insulating your room, you may try my "white noise" technique. I use a floor fan on medium speed in my polygraph room and it works perfectly. I have the fan placed between a wall and my file cabinet as to block air flow. I turn the fan on prior to the examinee entering the room and not once has it presented a problem. Just a thought...IP: Logged |
J L Ogilvie
Moderator
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posted 12-01-2003 02:24 PM
Actually I do both of these things. Our labs are reasonably soundproof but not totally so I also use the fan for "white noise".The room should be as free from outside noise as possible and a fan will certainly not interfere with the test. Although it might cause some signal noise on some components, ie GSR. Plug it into a separate outlet if possible. Jack ------------------
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Lieguy_Chip
unregistered
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posted 12-30-2003 12:33 PM
Ken;I use an alternative approach to soundproofing. I work in a typical police environment (pages on the intercom, radio scanners in the background, people yelling somewhere in the building, etc.) and I found that I just can't get a room soundproof. I have tried all of the tradional approaches, like insulation, weatherstripping around/under doors, even double layers of sheetrock.....all to no avail. Then, I "hit" on the real answer that actually works...I use headphones for the examinee. I plug the headphones into my computer audio card and I speak into a cheap microphone that clips to the side of my monitor. What a sweet deal! Now, examinees don't hear anything except my voice...you can't believe how it has sharpened up the charts....works great! Anyone that is interested can email me and I'll give you the parts I purchased from Radio Shack to make this happen. Total cost = about $200. Chip ------------------
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detector
Administrator
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posted 12-30-2003 12:44 PM
Chip, I'd like to know what that equipment was and possibly share that in the Chronicles...would that be allright?If so..please just post that info here Ralph ------------------
Ralph Hilliard
PolygraphPlace Owner & Operator
http://www.polygraphplace.com
[This message has been edited by detector (edited 12-30-2003).] IP: Logged |
Lieguy_Chip
unregistered
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posted 12-30-2003 01:35 PM
Hi Ralph;I bought a "Uni-Directional" mic that clips on the monitor from Comp USA .... cost$23
(make sure it's uni-directional, not omni-directional). I bought a Turtle Beach sound card for my PC, which has input and output feeds. Cost = $80 I bought a good set of Koss headphones (get the full ear type, not the small Walkman type) for $90. That's it! I just put the headphones on the examinee and speak into the mic when I'm testing....works great! ------------------
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