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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 at 4:54
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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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  • microphones don't record anything. – Mark Apr 9 at 4:53
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    You know what I mean. – Hobbes Apr 9 at 7:20
  • Yeah but I'm not the audience. – Mark Apr 9 at 8:02

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