hcfman

66 ms·

541.
by hcfman 3y ago
I learned how to localize sound events by the differences in the sound arrival time. And I learned how to keep sub microsecond time accuracy. Then I put the two together and made a raspberry pi sound localizer. https://github.com
542.
by hcfman 3y ago
I don't think they are saying that. They are actually giving you an opportunity to present a side that might not present based on just the details of your CV. You can help them understand you better. Surely this is a good thing rather
543.
by hcfman 3y ago
So that is a very selfish attitude from the poor bastards who have dis-trust from their government because their government screwed them over. For example, in 2005 I moved next door to someone that a year later was busted for growing hennep
544.
by hcfman 3y ago
Localize to car parks that was supposed to say. One node almost 5km away. Another more than 2km. One more than 3km. But they all converge nicely to a small area.
545.
by hcfman 3y ago
Sound localizing. I was intensely passionate about it when I saw the possibility to do it well on a Raspberry Pi. There were quite a few more problems than so expected which is why it took five months (of weekends) to complete it well. But
546.
by hcfman 3y ago
The localization calculations you can do on an Android, recording audio aligned to less than a millisecond of error I’m pretty sure you cannot.
547.
by hcfman 3y ago
Me and a bunch of friends have systems setup kilometers apart and have fun doing forensic analysis to determine where all the explosions from illegal fireworks come from. In the Netherlands this happens several times a week in many places s
548.
by hcfman 3y ago
This uses the PPS signal on a GPS to trigger an interrupt to sync the time. Not doubt you would have that on a mobile phone. I suspect that mobile phones use NTP which could be quite a number of milliseconds out. However, it depends what ex
549.
Localizing sound sources on a Pi anyone?(github.com)
2 points by hcfman 3y ago|8 comments
550.
by hcfman 3y ago
Combine microsecond GPS clock with a sound recorder on an Pi and get a cool sound localization system.
551.
by hcfman 3y ago
Maybe by the same token, if it figures out you are lying it won’t help you at all.
552.
Raspberry Pi based sound localizing audio recorder(github.com)
3 points by hcfman 3y ago|1 comments
553.
by hcfman 3y ago
For those interested in bio-acoustic research a new sound localizing audio recorder.
554.
by hcfman 3y ago
Except that changing your sim card doesn't anonymize you because your phone still has the same IMEA number and that's logged as well. That's just a joke you see in movies.
555.
by hcfman 3y ago
More than that. In the Netherlands the prosecutors are allowed to lie under oath in court. You might then ask "Well what value has the court then? Good question. The thing is, this doesn't just work against suspects. This works wh
556.
by hcfman 3y ago
Hey don't knock it till you've tried it. I'm not saying don't use photos, what I'm saying is for future events like these there is a tool that can with the greatest of ease provide really valuable insights.
557.
by hcfman 3y ago
The sbts-aru project can also be run on batteries, it doesn't need a network and quickly converges to sub-microsecond time accuracy. A Pi zero would run for 24 hours on a 15000 mAh power bank. Reporters could deploy a few of these arou
558.
by hcfman 3y ago
And photos can't be manipulated? If you use sound, the sound timing can come from multiple independant sources and any outliers, i.e. manipulated ones, can be left out. It would be a lot easier to have multiple sound sources for future
559.
by hcfman 3y ago
And while you are at it, sync your webcams from this stratum #1 time source to make it more accurate as well. Easy installation with just one command :) Up in the air within 20 minutes.
560.
by hcfman 3y ago
Now if you install a few Raspberry Pi's with a cheap GPS and a cheap microphone you could likely use my sound localization project and perform very accurate localization and know for sure in future incidents: https://github.
561.
by hcfman 3y ago
At a certain point you have to say enough is enough. The same for the cyber resilience act that spits in the face of millions of open source developers who collectively are the only reason governments have all their nice toys to play with.
562.
by hcfman 3y ago
If the governments vote laws that are aggressive towards the people, then the software developers need to make licenses for their software disallow government use until they start to be more citizen friendly. There are a lot of software dev
563.
by hcfman 3y ago
Are you kidding me? You think those things work?
564.
by hcfman 3y ago
Governments need to realise that really stupid laws don’t need amendments. They needs to be thrown out.
565.
by hcfman 3y ago
Yes, and that’s sad because we are absolutely not a “functioning” democracy.
566.
Low cost Raspberry Pi based sound localizing(github.com)
4 points by hcfman 3y ago|0 comments
567.
by hcfman 3y ago
Can we then add to the law that if the government is actively exploiting it that they can tell us as well ?
568.
by hcfman 3y ago
To honest, I'd also be thrilled to have badgers and foxes in my garden, I have to drive for miles to see them. Wolves, maybe less so, but only on account of my chickens and small dogs.
569.
by hcfman 3y ago
My results are similiar on one of my units: $ chronyc tracking Reference ID : 50505300 (PPS) Stratum : 1 Ref time (UTC) : Wed Oct 11 06:38:29 2023 System time : 0.000000172 seconds slow of NTP time Last offset : -0.00000
570.
by hcfman 3y ago
(Sorry about all the typos, ADHD problem). And the communication problem was that for gpsmon to communicate "with shared memory" correctly to chrony gpsmon needs to start first. The default installation sets the order the other wa

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