08-12-2013, 11:02 AM
(08-12-2013, 10:38 AM)mtw220 Wrote: http://subliminal-talk.com/thread-2290.html
That link should have some info on this, otherwise Shannon can elaborate.
Thanks, that was useful information!
I can understand how the ultrasonic recordings can work in mp3 with special encoding settings. However, I also read that the masked versions are made with a difference in volume settings of 20 to 80 (!) dB below the masking track. As the audio characteristics of the masking sound are wide band, the mp3 encoding will have to work with settings that maintain that wide band signal, leaving less capacity to encode extremely low level subliminal information... Even with special encoding settings, it will be difficult to maintain the full subliminal information. I understand from the link that the mp3 files are encoded with 320 kbps, which is indeed a high bitrate. But even in this case the subliminal information is likely to be compromised, due to the large level difference, I think...
This makes me wonder: any reports that the ultrasound versions are actually more effective than the masked versions, perhaps ?
