(01-19-2013, 02:38 AM)Shannon Wrote: The first issue I see is that the subliminal should be registering as being from about 14,000 to 20,000 Hz (14kHz to 20 kHz) centering on 17.5 kHz. If it's starting at 4 kHz and cutting off at 16 kHz, it's been severely damaged. Somehow it got "undone". Have you re-encoded or "optimized" it for iTunes or some other form of transcoding?Thanks for your response.
If it's not damaged, I don't know how to explain it starting so low and cutting off so low unless you have some seriously poor quality
As for re-encoding etc, no not consciously. Unless the player does some magic internally. The file still exists as a .mp3.
I tried with vlc player and audacity as well.
Could you suggest how to play it on a iPhone?
As for the frequency registered, I would choose not to give full marks to the frequency recording app for the fact that it also depends on the sensitivity of my
iPhone mic.
Could you suggest a better way to clock the
frequency response?
Secondly, how do I assert that the file is not damaged or 'undone'? Any checksum available? Just in case downloading has been the issue..
At what dB should I play it? Most of the laptop based players have equalizers.
If I play it at a low volume, freq registered is low as well. I need to know the right distance of the player from the subject.
Thoughts ...?
