Is it possible to make a pure sine wave of say 500Hz and make it silent, so it can’t be heard when played as a wav file ?
I want a computer to receive the sound wave information and process it.
I realise I can do it with high or low frequencies beyond human hearing, but in this instance I want to do it with a 500Hz sound wave.
I was wondering if noise cancellation techniques could be used ? In which case is it possible for Audactity to create this?
You’ve not really explained how/why you want this, so this may not be quite the right answer for what you want, but give it a try anyway to see what happens:
(instructions assume that you are using the current 1.3.14 version of Audacity)
- Generate menu > Generate a 500 Hz sine tone
- Select the track and duplicate it (Edit menu)
- Select the duplicate track and apply the “Invert” effect.
- Solo one track and play it
- Solo (only) the other track and play it
- Un-solo both tracks and play them.
Playing the inverse of any audio track through the same loudspeaker will result in silence.