Speech recognition, noise cancellation microphone
Stenomask is a hand-held microphone built into a padded, sound-proof enclosure that fits over the speaker’s mouth. The purpose of a Stenomask is to allow a person to speak without being heard by other people, and to keep background noise away from the microphone. source
If your activities sometimes requires that you talk in a noisy environment with voice privacy and without any noise interference, then this microphone is specifically built for you. It is ergonomically designed for easy handling and with hands-free option. If you totally wish to talk in the public but in a private mode, here is what you need.
https://talktech.com/stenomask-steno-sr/
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