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  Austin Liu

  3 years ago

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  In my prior comment, I mentioned the use of a diaphragm to transmit the sound of speech through the mask without the need to resort to battery powered speakers and microphones. See this video of a DIY mask that does this: https://youtu.be/udzYUsiYH0k

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  Austin Liu

  3 years ago

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  What bugs me about the use of powered solutions that use microphones and speakers to enable the user to speak clearly is that this is such a high tech solution when a low tech solution is being overlooked. If you leave an area where you stretch a tight diaphragm, the diaphragm will transmit the sound of the speaker right through. No consumable batteries nor extra cost from speakers are needed.

  
  

  Also, there is something that a lot of mask designers overlook.  In a typical mask, the outgoing breath ends up condensing water on the filter medium, which makes it increasingly difficult to breath through the mask. In a respirator mask, valves control the flow of air, so the breath cannot go back through the filter and condense water on it. But some places forbid masks that release unfiltered breath out of the mask via a valve.

  
  

  The solution is to use valves anyway, but to filter the outgoing breath. Why bother using a set of valves if you're going to filter the outgoing breath? Because the valve that prevents your breath from passing back through the filter still makes it easier to breathe by preventing condensation on the filter. People under-estimate how annoying the condensation on a mask can be. It really makes a difference.

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  George Mokray

  3 years ago

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  My bandana face mask with wire frame, based upon ideas from the Spanish flu epidemic a century ago

  https://youtu.be/eVPBQczb9gI

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