kindiana

61 karma · joined May 13, 2014

kindianaon Phased Array Microphone (2023)

(OP here) Primary reason is that you can make a big array with only 2 boards, a small board in the middle and a bunch of long boards around it.

Radial pattern of linear arrays with exponential spacing should also be pretty close to optimal for the distribution of pairwise microphone distances to maximize the gain with a fixed number of microphones.

kindianaon Phased Array Microphone (2023)

(OP here) the $700 was for 50 arm boards and 5 hub boards, fully assembled and shipped including all the parts (enough for 2 full arrays, with some spares). $350 @ qty 2 is pretty good, considering just the microphones is ~$100 for each array!

Unfortunately the assembly/DFM didn't work out well, but with some better design and foresight it should be much less work/wiring compared to wiring them manually.

kindianaon Phased Array Microphone (2023)

(OP here) tverbeure hit most of the main points, but mostly cost ($2/mic vs $0.5/mic adds up when there are 192 microphones), difficulty of finding things with enough i2s interfaces (even with 16 way daisy chaining, thats still more than most/all things will have). The FPGA/custom hardware was part of the fun as well!

kindianaon Phased Array Microphone (2023)

OP here, cool to see so many people are interested in this project! Happy to answer any questions (and I'll go around to reply to any questions already here)

kindianaon Miscellaneous Arduino bits and pieces

https://www.kickstarter.com/projects/658903329/remoteboot-wi...

https://www.crowdsupply.com/ben-wang/remoteboot

I've created a successful Kickstarter project doing exactly this ;)

Uses a ESP8266 chip and has the basic version of what you described

kindianaon Lee Sedol Beats AlphaGo in Game 4

It should use less that 0.5 megawatt, 1920 * 150W (High end server CPU) + 280 * 300W (Nvidia Tesla cards)

kindianaon Ask HN: Which game has an impressive AI?

Check out Three Body Problem, not really AI but... awesome