Tap When You Stop Hearing It Will Flatter You
Two beeps, one tone. Guessing scores 50% by construction, so the highest frequency you can hear cannot flatter you.
Morse tells you which bands a phone can carry. This tells you which bands your ears catch. Both have to be true for a high carrier to be useful, and they are different questions. A tone the room can hear is not covert no matter how cleanly it transmits.
Try it in the browser — two beeps, one of which holds a tone. Your browser plays them. Nothing is recorded and nothing reaches my server. Use wired headphones. Through a speaker you are measuring the speaker.
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