Can anyone help me with this- recording at audio signal in the upper frequency region of the audio s

Question

Using Audition, how would I go about recording an audio signal (voice) at
14,500Hz? I know this would be outside the frequency range for the human ear to hear, but that is the point of my question. Any help would be very much appreciated
Thanks!!!!

Answer 1

You are thinking about it absolutely the wrong way if you think you can "convert" a voice file to be only 14.5kHz. You need to think of a control frequency (14.5kHz) being modulated by the voice line you record. You can't just change the pitch of the voice file or use the FFT filter to eliminate everything under 14.5kHz. It won't work that way.
Try it yourself. Record a voice line. Use Pitch Shifter or pitch strech to change the pitch on the voice. Crank it up all the way to highest possible pitch. Listen to it. Painful isn't it? Could you understand anything? Thought not. Then go to the FFT filter. Reset so it's flat. Add a break point (click on the line) at 14.5kHz. Then click and drag the line below 14.5kHz and bring it to zero. Listen to it. You get the occasional movment if you watch the Frequency Analysis window, but certainly nothing audible to my burned out ears.
The direction I would look at is using the Vocoder effect in MT. insert your voice line into the MT window. In EV, create a new file using Generate Tones at 14.5kHz of the length you need. Insert the tone file into MT ABOVE the voice file. Select and highlight them both. Still in MT, go to Effects>Vocoder. Make your Control Wave the voice file and your Process Wave the tone file. Hit OK. A new file (that looks blank) will be created. Play it in EV with the Frequency Analysis window open and you will see activity at 14.5kHz. This is amplitude modulation (AM). Will it result in anything subliminal? I doubt it, but it would depend on how much you belive subliminal messaging works.
Didn't an earlier version of Audition have some subliminal effect? Could it have been as far back as CEP 1.2?