HIGH QUALITY TPU DVD Video Released from Jack Durban

[Feynman]

i do not think that is correct. (calc must be done w/ powers of two)

fB : base frequency 
fH : harmonic frequency
M : Multiple
O : Octave

fB = 7.8hz
fH = 3,993.6hz

M = fH / fB
M = 3993.6hz / 7.8hz
M = 512

Harmonic is 512x multiple of the base.

How many octaves up is this harmonic?
2^x = fH / fB = M
x = log2(fH/fB)
x = log2(512)
x = ln(512)/ln(2)
x = 9

fH is nine octaves above fB.   

aka
7.8 * (2^n) will give "octaves", where n = octave


PS
thanks for info on sine/square/saw FT differences

[aleks]

aka
7.8 * (2^n) will give "octaves", where n = octave

Well, OK, you are right in this sense. However, physically it is much irrelevant since physical processes deal with harmonics mainly.

[turbo]

P.S.  @Marco,   I not sure what you're looking at there, but there is no frequency content in the buzzing above 5 kHz,  there is however a continuous 12 kHz and 17 kHz  (approx)   frequency that I see, which is not part of the buzzing sound, so I condensed the chart to the frequencies you see.   I'll have to analyze the old video sounds, maybe they're different, which would mean distortion  introduced due to resampling to a lower bit rate perhaps.

EM

I know what i analyzed.
The images are a crystal clear representation of the sounds made by the coils.
I do remember analyzing more then one take from diffrent coils and i am not shure which one you analyzed.
Steven stated in one of his video's the coil was running close to 5500 hertz which match the spectral graph quite perfect.
These signals are so clear and so close that it cannot be distortion.

I like the idea Aleks presented about the square wave and the harmonics.

If i can find some spare time i will fire up the gear i used to analyze the video's once again and note the time stamps so we can compare our findings.

M.

[EMdevices]

oh,  so you might have analyzed sound from other sections, interesting.   I thought it was only the mini TPU that buzzed.

nice deduction there aleks, 

EM

[EMdevices]

back side view,  notice the double strand is clearly visible, AND the winding direction 

EM