Sound hyphosis. The engeneering part of it.

[cavemen]

(third guy using cavemen username)
Well. I know it aint physics. I am looking at the physics part of it.
I heared something about modulating words into background noises or ultrasound in such manner that the subconscience hears them but conscience doesn't interpret them into words.
Claimed to be used for hypnosis.

Mythbusters tried it. :)

At this point I have my hands on a lot of recording software, microphones and stuff like that at work.

DID YOU HEAR anything about such devices?
Do you know a method that is proven to work to some degree?

I am thinking of what to modulate sound into.
Thanks.

[Danger]

Try Googling 'subliminal messages'. Here's a start...
http://en.wikipedia.org/wiki/Subliminal_message
By the way, such messages were outlawed for use in advertisements.

[cavemen]

aint doing this in advertisement
thanks for giving me a keyword to look for

[cavemen]

Found no scientific descriptions of how those systems actually work.

[Danger]

Pardon my slow response; I've been busy.
Most of what I know about the subject came from the book 'Subliminal Seduction'. I don't know if you want to spend any money on this or not, but here's a link to a source.
http://www.amazon.com/Subliminal-Seduction-Wilson-Bryan-Key/dp/0451061489

[xxChrisxx]

I'm not too convinced by the traditional view of 'subliminal messages'.

It is true that you can work suggestions and manipulate surroundings to have a limited control over poeple.

For example, When other people listen to the radio and a song is on, I won't be listening to it and wouldnt be able to tell you what was playing if you asked me, but minutes to hours later that day I will start humming the song without realising it. I won't even realise why I have the song in my head.

It's that sort of thing that works with people, this backwards speech or ultra sound im not convinced works.