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Re: capsule array self-noise

 

Got it, thanks Jules!? I'm actually familiar with that concept from another field (mass spectrometry). So now this followup: If a cluster of 5 small capsules around a center one has the same total useable diaphragm area as one large capsule, if a large and small capsule have the same intrinsic noise level, and if when exposed to a test tone the large one generates the same voltage ~per unit area~ as a small one, then would the small-capsule cluster still have markedly better signal to noise ratio?


On Tue, Nov 14, 2023 at 7:16 PM, Jules Ryckebusch
<ryckebusch@...> wrote:
Hey Joe, the theory goes like this: the signal to each microphone is correlated. ?For two capsules the signal adds by 6dB. ?But the noise is not correlated so it adds by 3dB. You have to keep doubling the number of capsules for the math to continue to work. ? Adding more capsules adds some complexity but the theory shows an improved signal to noise ratio.?
Best Regards,

Jules Ryckebusch?

On Nov 14, 2023, at 18:09, Joe Todd <jjthaden@...> wrote:

?I've read that an advantage of a cluster of capsules is a decrease in noise (or is it just increased S:N?).? If lower, why? Can the array's noise be lower than that of a single capsule of that model?

Thanks in advance

John Thaden
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