What is the most practical application for this technology? Could you use it to pinpoint sounds coming from a car like a squeak?
The tech is beamforming .. the applications are AV conferencing, camera tracking, voice lift, or sound reinforcement
Phased Array Microphone (2023)
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Re: Phased Array Microphone (2023)
#42Nice. It would be cool if this project could cleanly separate sources based on location. That would be a bit like a lightfield camera, where you can edit the focusing parameters after the image has already been taken, but now with sound. https://en.wikipedia.org/wiki/Light_field_camera
I’m still sad these didn’t become a thing. I don’t need a 48MP camera phone. No seriously. I do not.
Re: Phased Array Microphone (2023)
#43"As part of the calibration, the speed of sound is also a parameter which is optimized to obtain the best model of the system, which allows this whole procedure to act as a ridiculously overengineered thermometer." Reminds me of the electronics adage: "all sensors are temperature sensors, some measure other things as well."
It does act as a thermometer, if and only if the altitude remains constant. The speed of sound fluctuates with both temperature and altitude
Right, it gets even worse: Air pressure in not only altitude-dependent but fluctuates even at constant altitude. The pressure (altitude) dependence is comparatively weak, though.
Re: Phased Array Microphone (2023)
#44I would love to see this come to our various mobile devices in a nicely packaged form. I think part of what is holding back assistants, universal-translators, etc, is poor audio. Both reducing noise and being able to detect direction has a huge potential to help (I want to live-translate a group conversation around a dining table, for example). Firstly it would be great if my phone + headphones could combine the micr…
I believe modern macbook pro’s already have multiple microphones that probably do some phase-array magic.
Re: Phased Array Microphone (2023)
#45"As part of the calibration, the speed of sound is also a parameter which is optimized to obtain the best model of the system, which allows this whole procedure to act as a ridiculously overengineered thermometer." Reminds me of the electronics adage: "all sensors are temperature sensors, some measure other things as well."
> Reminds me of the electronics adage: "all sensors are temperature sensors, some measure other things as well." I wanna say that’s a Bob Pease quote but I can’t find an attribution to it.
I first encountered it in Elecia White's book Making Embedded Systems, but the attribution is anonymous and whom it's attributed to may have heard it elsewhere.
Re: Phased Array Microphone (2023)
#46I wonder how well this would work with laser microphones on a pane of glass. Can you infer keystrokes with near infrared laser? That is, can you identify the heatmap of keystroke events to infer which keyboard they're using, then replay the tape to identify the strings of characters being typed? Can you localize the turning of pages with UV?
Didn't Israeli students show that you can recover audio from the vibrations of bulb filament with a fast photo diode?
I'd test that with a CCD line sensor plus a wide aperture lens and reading it out with 8kHz. Then you have 128 audio pixels that can cover an entire city.
Re: Phased Array Microphone (2023)
#47Earlier quoted context omitted.
It does act as a thermometer, if and only if the altitude remains constant. The speed of sound fluctuates with both temperature and altitude
Right, it gets even worse: Air pressure in not only altitude-dependent but fluctuates even at constant altitude. The pressure (altitude) dependence is comparatively weak, though.
one might say air pressure changes constantly as we speak.
Re: Phased Array Microphone (2023)
#48Look up acoustic cameras on YouTube, there are some pretty impressive demonstrations of their capability. This is one of the companies I've been watching for a while, but it looks like FLIR and some other big names are getting into it: https://www.youtube.com/@gfaitechgmbh
The one use case that is both creepy and interesting to me is recording a public space and then after the fact 'zooming in' to conversations between individuals.
Re: Phased Array Microphone (2023)
#49"As part of the calibration, the speed of sound is also a parameter which is optimized to obtain the best model of the system, which allows this whole procedure to act as a ridiculously overengineered thermometer." Reminds me of the electronics adage: "all sensors are temperature sensors, some measure other things as well."
I love these kind of inadvertent measurements. One of my favorite examples is that a sufficiently accurate IMU can get you relatively accurate longitude measurements from the Coriolis effect.
Re: Phased Array Microphone (2023)
#50Earlier quoted context omitted.
Then, why not be a grad student again?
Maybe they want to afford dinner?
Hey saw your message a while back in a thread talking about continuous glucose meters and feeling tired and fatigued etc.
Mind contacting me? I'd love to chat. My email is in my profile