Project idea (phased mic array calibration for event recording)

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lutzray

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I despise abusing patent law systems. Feel free, in accordance to applicable intellectual property laws in your jurisdiction :cool: to implement and distribute this method, apparatus and process to capture the sound field of live acoustic musical events, permitting noise cancellation and source isolation (as with Seeed ReSpeaker Mic Array https://www.seeedstudio.com/ReSpeaker-Mic-Array-v2-0.html )

Before recording the event an array of microphones is positioned relative to an array of fixed punctual sound sources (ideally ommnidirectional). For triangulating the microphone position, minimally 3 sources are necessary, each one emitting a wavelength adapted to optimize accuracy and avoid the "integer ambiguity" typical of positioning systems. Each microphone is brung near the triangulation base, turned on and gradually taken away while recording the base acoustic signals to its final place planned for the event.

Knowing the precise position (at centimeter level) of each microphone, phase correlation can be done using their respective recorded signal. Source isolation (noise, multipath and reverb elimination) is then possible.

A couple of Teensy boards with low self noise MEMS microphones could do the job :cool:

If real time source isolation is needed (for amplification in a live concert as opposed to a studio recording) bitstreams could be sent to a digital audio workstation with adequate processing power via electrical or optical cables (RF transmission performance would probably be problematic)
 
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