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Gadget Freak Case #242: A Gadget's Call for Assistance

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taimoortariq
User Rank
Gold
Re: The groan detector
taimoortariq   7/3/2013 4:29:01 PM
NO RATINGS
And I do hope that the sound acquisition and the filtering system of this device is robust and flexible, because practically every person will have different stroke groan at different frequency, I hope they have catered for this problem in a more generalized & effective way. So that it proves to be marketable.

armorris
User Rank
Platinum
Re: The groan detector
armorris   7/6/2013 12:17:42 PM
NO RATINGS
This device is intentionally designed so that it does not have to be tuned to anyone's voice. The design should be marketable just as it is. If you set the low-pass filter (LPF) to 1000Hz and the gap to 50mS, it would respond to anyone's voice (male or female). I have switches to lower the LPF to 500Hz and the gap to 15mS to get the maximum possible rejection of background noise. The system still does an excellent job of rejecting background noise at 1000Hz and 50mS.  Any sound that passes through the LPF and is uninterrupted for 1.5 seconds will trigger it.

I tested it in my house with blaring loud music in the background and, depending on the location of the speakers relative to the microphone, it would respond to my voice only and not the music. I have sinus trouble, which sometimes causes my voice to break up. Feeling that a patient might have the same problem, I added a switch to set the maximum gap width to 50mS. If you didn't want to put any switches in it, I would set the LPF to 1000Hz and the gap width to 50mS. The noise-cancelling microphone helps a lot as well.

Cadman-LT
User Rank
Platinum
Great Gadget!
Cadman-LT   7/16/2013 8:56:23 AM
Great gadget Andrew! I love gadgets that serve such a great purpose.

tucsonics
User Rank
Silver
Groan Detector/Amplifier
tucsonics   7/16/2013 5:51:10 PM
NO RATINGS
There may be another approach to this. A miniature voice recorder, like the Sony IDC-BX700, has a VOR mode (Voice Operated Record).  The earphone output can be fed to a small amplifier/speaker which can be located in the caregiver's room. This eliminates the possibility of feedback. The recorder would be placed in the Record mode with VOR, close enough to the patient's mouth. One would adjust the threshold of the VOR  and/or distance to the person. Recorders have a microphone input also, so a mic can be easily positioned if the recorder can't be conveniently placed. The battery consumption is low when in VOR mode. Some recorders also have a DC supply input (for a wall wart).

armorris
User Rank
Platinum
Re: Groan Detector/Amplifier
armorris   7/16/2013 6:42:18 PM
NO RATINGS
tucsonics,

I suppose that would work, but the lady asked for a wireless link and a loud signal that could wake a possibly sleeping caregiver. It also needed to ignore background noise, like her husband's favorite radio program. There are of course, many ways to skin a cat, each with its own set of advantages and disadvantages. 

Cadman-LT
User Rank
Platinum
Again
Cadman-LT   8/15/2013 7:58:24 AM
NO RATINGS
Again great gadget. Keep helping people...it's the best use of technology!

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