Oh. Dr. Stone: Signal Processing Question

[forest bay]

QotW courtesy of @brazen acorn
Feel free to send your answers to @brazen acorn in private. Or send them here, in this post's comments section but please spoiler them!!

[frank edge]

Can we share the logic instead of the waveform?

[vocal junco]

I thought the message was "12800000 meters. 1 second"

[sterile dust]

i knew the name choice was deliberate

[brazen acorn]

Generally I expect the waveform as an answer

[shell hull]

||is it 1 bit per second?||

||it looks similar to that but then it kinda desyncs from the axis so im confused on what that's trying to say||

[brazen acorn]

Please hide the questions

[brazen acorn]

||baud rate is specified in the final paragraph||

[shell hull]

oh no, i don't know shit about that

oh well

here goes nothing

[brazen acorn]

I'd hate for you to walk away from this. I promise it's not as hard as it seems

[shell hull]

i mean it's midnight so im not exactly thinking straight lol

[brazen acorn]

Well you have an entire week!

[shell hull]

that was definitely a kneejerk reaction to it, i work with arduino and i know what it is lol. just took a bit of searching my memory

is desmos a viable medium to submit?

[brazen acorn]

Yes!

[shell hull]

cool

[slim vessel]

Ngl this is a really cool question

[vocal junco]

Ok I think I understood how the modulation works

[slim vessel]

Yeah it looks like FM

[frank edge]

||The digital version of FM, the FSK to be exact ||

[silk sandal]

||sooo i have no idea about and form of radio communications

But i just love to get the random information here and there

So what i understand from the graph is that it can be a binary wording saying ||

||01010101101010

Which is

01010101 101010

Which is

(Communication prefix) *||

[deft gazelle]

I can only write the message in asci values

That’s how far I got
Idk how to transform to signals

[silk sandal]

||Acc to the ascii table i think it was an "*" said by the probe||

[silk sandal]

||i am just guessing that the frequency maps to the binary and less frequency corresponds to 0 high frequency to 1||

[brazen acorn]

||Please read the prefix part again||

[hidden basalt]

I don’t mean to be pedantic but ||the Time axis doesn’t have a unit of measurement, I’d assume it would be in milliseconds but what if the signal is instead in microseconds or tenths of milliseconds? Would this affect the validity of our answers?||

[brazen acorn]

||In this case it doesn't really matter. I'd accept any combination of frequencies ||

Bonus points if you calculate the exact ones and use it

[hidden basalt]

On that bonus opportunity right now

Ok so ||baude rate is the number of symbols over time, represented with the unit of Bd. The question’s audio answer option requires a Bd of three, we have 1 symbol every 1000 unit undetermined.||

[brazen acorn]

||I'll verify if the plot actually has a baud rate of 3 and get back to you. Iirc it does||

||Please also note that time units are left without a measurement intentionally||

It does

TO RESOLVE ANY CONFUSION:

Please use 8 bits per symbol.
Example plot does not contain any data and is used ONLY as an example

@forest bay can we have that pinned please :>

[forest bay]

Done 👍🏻

[fierce estuary]

Dr. Stone?!?!

Like the anime one?

[silk sandal]

Ya i did a typing error

But i want to know if my general idea was right?

[brazen acorn]

Seems right to me

[slim vessel]

Idk if anyone's sent it yet, I guess it should look something like this...

[brazen acorn]

I'll check and get back to you

[sudden shoal]

👁️

[deft gazelle]

On what program did you do this wave

Or signal

[slim vessel]

python

well technically the program is on a jupyter notebook, but that's not really relevant, it's just my preferred python compiler

you can generate graphs like that in matlab or octave if you want

[brazen acorn]

@radiant ingot hey! I noticed you checked the reaction. Did you have a solution to submit?

[fierce estuary]

Maybe they dmed Robin

[forest bay]

No one dmed me

[brazen acorn]

That is sad

[brazen acorn]

You can check the check! congrats!

[forest bay]

ANSWER
https://colab.research.google.com/drive/1GZLK0giy-Xo5vZxStLdTkFXO8iUCSr43?usp=sharing

[vocal junco]

Forgot about this completely

[brazen acorn]

A shame

[fierce estuary]

why is this math