On 17/12/2018 09:39, Dave Hunt wrote:
How might they phase/time align the capsules ??
This must indeed be highly complex, as it is frequency dependent (low
frequencies have smaller phase differences than high frequencies) as well as
source directionally (across multiple blind sources) dependent.
Surely this is just multiple beam-forming - taking the different signal
levels of single events at each capsule and correcting them in the time
domain to be aligned as closely as possible. Yes, that's frequency
dependent so has to be done narrow band, but can be done for multiple
events, a multiple number of times.
This seems to be an approach that's been used by at least two mic
manufacturers that I know of (Audio Technica and Schoeps) to improve
directivity of axial mics. With increasing processing power the ability
to generate more simultaneous beams allows this to be done for multiple
directions. The ones that I know use this technique use flat arrays and
limit the beams to a 180° arc, but I don't see any reason not to extend
the technique to 360° or a full orb.
I should state that this is entirely supposition - I have no actual
knowledge of doing this.
Chris Woolf
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