Friends of Andrew Morris needed a device that could detect a stroke victim's groan and convert the sound into a signal so caregivers would know when help was needed.

After trying unsuccessfully to create a device that could detect the characteristics of the victim's groan, Andrew remembered an answering machine -- from 30 years ago -- that could detect gaps and brief interruptions in the audio that helped the machine detect the difference between a dial tone and a human voice. So Andrew designed a circuit to do just that, thus giving the stroke victim the voice to call for assistance.

Click the image below to see more of the gadget.

Andrew Morris designed a circuit that could detect a stroke victim's groan and convert the sound into a signal so caregivers would know when help was needed. Here is the receiver unit.

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