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by lightswitch05 805 days ago
I must admit I've never used chrony, so I'm unfamiliar with how to configure it. I've read a lot say saying gpsmon's shared-memory-segment is a really great interface and to go with it instead of NTP's own GPS drivers, but I cannot say that lines up with my experience. I do have one computer setup this way, and it works, but I found on the PPS configurations, it seemed to me to have better accuracy and less jitter using NTP's own GPS drivers and taking gpsmon out of the equation. Its quite possible I just don't know the right configuration combination, but ntpsec's own GPS drivers work great for me.
1 comments
hcfman 804 days ago
Ah okay. Conversely I've never tried that setup :) Nice to hear about it though.
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lightswitch05 804 days ago
This is off-topic, but I was looking at your sbts-aru project and remembered having read the hackaday post on it about fireworks. I'm curious if you've ever seen the RaspberryShake BOOM sensor? If so, any thoughts on how your project and it differ?

https://shop.raspberryshake.org/product/turnkey-iot-atmosphe...

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hcfman 804 days ago
I hadn’t seen that. It uses a pi so in principle it could sync the time the same way. How well related to localizable recordings would also depend on how it establishes the actual time arrival with the clock and how it deals with jitter.

Currently I only support USB mics at 16 bits that can talk to jackd. This was a conscious decision because it was all that was needed but also because jacks makes it essentially have multiple source sinks. Such as as well as recording a real time audio processing pipeline that potentially leads to real time gunshot and other sound event localization.

But it would be cool if the infrasound sensor had a USB sound interface. As then it could be useful in localizing elephants.

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hcfman 804 days ago
If it syncs time accurately by any method maybe you are able to localize some very interesting events! The localization code I provide with my project should fine with times obtained from this project. I seriously doubt whether that project uses a memory overlayFS but it’s to add as an improvement.
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