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Is it possible for software/hardware to "hear" a certain sound and then perform an action (text alert) ? The prototype I am trying to develop is a little more detailed than this, but the description I gave here is simplified in order trouble shoot a solution for it. Thanks.

What I have tried:

I have tried many many exhaustive Google searches, I have tried and assortment of "Audio Triggering" software, I have researched devices for the deaf, alarm systems, etc...
Updated 29-Jul-20 23:38pm

Have a look at something like the Arduino - here are some sample audio projects[^]
Similar alternatives ...
Raspberry Pi, BeagleBone, Sharks Cove, Minnowboard MAX, Nanode, Waspmote or LittleBits are some of the most interesting alternatives to Arduino. Clearly, Arduino and Raspberry Pi are the ones receiving the most attention within the community of software developers. And that is reflected in Google Insights’ most important trends.
from The best alternatives to Arduino: from the Do it Yourself to the Internet of Things |[^]
C# sound detection: (You didn't specify a platform)

audio - Clap sound detection in C# - Stack Overflow[^]

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