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Many years ago in the UK there were lots of "throat microphones" about, left over from the second world war. These were used by tank crews and were a pair of microphones mounted on a flexible tape that went snugglely around the users neck. This was so they picked up the vibrations from the voice box direct and not from the air around the users mouth, because this would have picked up a lot of noise as well. Try this out or buy some throat mics.