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The post links to an inexpensive array at the end. I don't really get why the 16-mic one he used is so expensive, those smd mics can't be more than $1 or so eac
by ghostly_s 5y ago
The post links to an inexpensive array at the end. I don't really get why the 16-mic one he used is so expensive, those smd mics can't be more than $1 or so each...
- supermatt 5y agoYeah, the respeaker ones i have looked at - but at $25+ they still feel very expensive to me. Are they that complicated/expensive to make?
- qazxcvbnmlp 5y agoIt’s probably a niche enough product that the engineering / marketing work that goes into it is a higher fraction of the cost than the raw components.
- atoav 5y agoThe mics are probably cheap but 16x ADC in decent quality with decent power supply and low time offset between channels? How much is a 16chn audio interface with 16 mic preamps these days?
- Anechoic 5y agothose smd mics can't be more than $1 or so each The actual mic capsules are likly far cheaper than $1 a piece (probably closer to $0.10 than $1) but the mics in an array need to be phased-matched. The two approaches to getting phased microphones are 1) building them using precision techniques so they are phased-match from the start (which is expensive and why pro phase-matched mics are around $1,000 each), or 2) get a whole pile of cheap mic, test them one-by-one (or really, pair-by-pair) and select the mics that are best phased-match to use them in the array. The #2 approach is cheaper, but does add cost.
- 323 5y agoCouldn't one instead record at a higher sample rate (192 KHz+) and then align in software instead of phase matching the mics?
- bytK7 5y agoI don't know enough about this so maybe dumb question, but couldn't you use DSP to correct phase between microphones if you knew their relative differences?
- loxias 5y agoYes you can. Another problem though is that the microphones need to have a common timebase, unless you have More Magic.
- loxias 5y agoIME, the array only needs phased matched mics if you're doing SDB, or something else that cares deeply about audio fidelity. I've never used phased matched mics in my arrays (can't afford it!) and also have never needed to "bin" them. ("pair-by-pair" testing).