What kind of sound frequency which can be audible in speaker but cant be recorded & playback. I want to send a sound file which can be listen by receiver but cant be recorded for future playback use.

  • What you are suggesting is impossible to achieve.
    – Mark
    Apr 9, 2020 at 4:54

1 Answer 1


You can't do this. If a sound can be played back by an ordinary speaker, it can be picked up by a microphone.


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