Odd request for ultrasonic conversion
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Posted Apr 14, 2019, 11:06 PM UTC · edited
05
Anyone over 25 is pretty much immune to anything over 16khz. All but the most high end headphones are dropping off at 18khz so far as graphing flat response.
Most hypnotists I've worked with use inflection diction gate and low frequencies to induce hupnotic state. What's up with the hf stuff?
2
No idea. Her thing, I guess.
1
Humans won't even be able to hear that, what's the point?
Sounds like a quack to me too
1
We messed around with this a while back, seeing if we could get Siri to hear something a human could not. (We were unsuccessful).
You have a narrow range available to you between adult hearing and the cut off for hi fi reproduction. You need to pitch up the voice 5-7 times, and then apply a high pass filter somewhere between 16-18k.
The voice will not be audible, so there is not way to tell if it’s intelligible.
1
I don't believe there are any consumer level speakers that will reproduce ultra-sonic frequencies. I'm also pretty sure that most A/D converters low-pass at 20k, cutting off any ultra-sonic frequencies. Your friend is a quack tho, so I wouldn't feel bad about just giving her back the music w/ no to slight eq alterations and taking that money.