locating Steve Mark´s TPU demonstration house

[innovation_station]

YOUR ANSWER

http://www.youtube.com/watch?v=NlBg-hVTIOM

i dare you to hit this with 1k

ist

[EMdevices]

These spectrograms are generated from the SM video audio.

1st)      SM walks back inside the mansion after demo in the street.

2nd)     SM is measuring the large unit on the table, a period of silence.

3rd)      SM is activating the smallest TPU on the glass table

Notes:   In first graph,  the time periodic signals are his foot steps.  Also, notice the harmonic content is different for the two devices. It's possible the devices themselves add to the harmonic content of the power lines. In the third graph, it is clearly visible that new harmonics appear when the device is turned on (3060 Hz and above).  These harmonics are captured perhaps due to the sound of the vibrating TPU against the glass.   The other harmonics are most likely captured by ELECTROMAGNETIC interference upon the video camera,  NOT by sound.

These videos had the CLUES in them all along.  SM is tuning his devices to the power line harmonics, and his device is a tuned loop antenna of sorts.

[Trino Cularoid]

The even harmonics make it look more like a triangle wave than a clean 60 Hz sine wave, but the harmonics amplitudes don't seem to be weighted with the inverse square of their frequency ratio... I guess in older videos one usually gets odd harmonics though, because the 59.94 Hz (field rate) signal gets distorted towards a square wave.

Maybe the signals are a result of (constructive or destructive) interferences of 60 Hz power grid(s), 59.94 Hz (29.97 Hz frame rate) of camera, and other signals (e.g. running TV, etc.).

It could possibly also be an analog camera, not a digital CCD variant, so maybe it could be more like a sawtooth-like wave than a square wave distortion.

[hartiberlin]

EMdevices,
which video file did you use ?

Do you really trust the AAC codec from the MP4 file ?

Also I agree, maybe he used an analog Hi-8 camera
where you have swicthing noise in the Stereo Hifi Audio
channel due to the recording rotating head principle with lots of overtones...

So I would not base any sound analysis on any MP4 file....


Regards, Stefan.
P.S. Didn´t you want to go there this weekend ?

[EMdevices]

Stefan,

you will see these Power Line Harmonics  (PLH)  in most of the videos, high quality and the previous ones.   These PLH signals are NOT due to the video camera hardware,  they are ELECTROMAGNETICLY induced due to the PROXIMITY to the power lines and the HUGE magnetic and electric fields present.     

Here's a good reference showing some VLH spectrograms near power lines (notice the distance of recording):

http://home.pon.net/785/man-made.htm

These SM videos had the clues in them all along !!! 
He is tuning his devices to these frequencies !!!

EM

P.S.  See the extra spectrogram I added in the previous posting.