Dear English native speakers: Is this valid English? The "to" sounds very German. If wrong, fortunately, they do not teach English but German.
Mäh W.
@maehw@chaos.social
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👨💻 I am interested in wired & radio communication, DSP, (embedded) software dev & engineering, FOSS, reverse engineering, IT security, space, programmable and non-programmable bricks, old and new computer technology, robots, machine embroidery & other things. Living in 🇩🇪. Speaking 🇩🇪/🇬🇧/💻 and understanding a little bit of 🇫🇷.
Ein Fall von ...
«Bitte drucken Sie aufs Schild
"Unterlagen bitte in den Briefkasten"
und
"Termine bitte per Telefon oder E-Mail vereinbaren"»
?
... but it gave me another plot so that I could compare the subbands and tell if that frequency was active or inactive during the symbol. Zooming in gives an idea about the symbol time and what frequency/symbol is active when. Seems like somehting I would call a "one hot" encoding, maybe that's typical for M-FSK.. but this also means that only four different symbols are available an not 8 or 16 (I may be wrong). I guess from here on it's "only" ...
Squaring the magnitude of the signals of the four subbands and low-pass filtering with a cutoff frequency of approx. 2*T_sym_estimated gave me this. Which IMHO doesn't look to bad for three subbands with the higher frequencies. The lowest subband (plotted in blue) doesn't look as good as the other ones. What could the reason be here? Distortion of the channel? Wrong parameters on my side? I don't know if normalizing the "energy envelopes" was a good idea ...
Fortunately, koje71@darmstadt.social gave me a recording which I've been trying to analyse. The top 4 peak frequencies here were indeed quite similar to the findings documented on GitHub: 1397 Hz, 1575 Hz, 1778 Hz and 2007 Hz.
LG has made a thing called "Smart Diagnosis". On some devices you press a special button for a specific time and the device starts to emit a sequence of tones that sound a bit like a fax machine.
I am looking for
1) people with LG devices who are willing to record the sound and share it with me for further analysis
2) folks with a better understanding of digital signal processing who are interested to help out doing demodulation+decoding.
🧵 A little thread...
Schee war's. Mussten nach dem ersten Halbfinale schon wieder los (trotz Ticket für Runde zwei). Aber morgen kommen wir zum Finale wieder, wenn alles klappt.
Ich war am Samstag im Deutschen Museum Bonn. Der Schwerpunkt dort ist KI. Bei einem Exponat entstehen dabei aus eigenen Zeichnungen Katzenbilder... oder Gadsenbilder: "Pix2Pix: GANgadse" — 'Ein Conditional Generative Adversarial Network (cGAN) hat ausschließlich von Katzenbildern gelernt und interpretiert daher alle eingegebenen Daten als solche.'
I might find out what the difference between these two printer models is: the Canon SELPHY CP-1200 and the Canon SELPHY CP-1300. One was able to print borderless, the other one not. One decided to consistently jam paper (got a used one as a replacement), the other one decided to print its ink instead of top print the ink on top of paper. Going to open them up.
Today, I checked out what a single step in the "LAYOUT" view of the #embroidery machine would be. Didn't read the manual for this... don't even know if it's documented there. Used ze good old Millimeter-Papier and pushed the needle down every ten steps. 0.5 mm per step seems about right.
