Subject: Re: [linux-audio-dev] off topic, optical protocols
From: Nick Bailey (n.j.bailey_AT_elec.gla.ac.uk)
Date: Tue Mar 05 2002 - 10:56:42 EET
actuallyt you can get digital microponones: they measure the
displacement of the diaphram by counting fringes on a laser
interferometer, so there never is an analogue signal (except
the physical movement of the membrane itself).
Damned if I can find a reference to it now... I hope it
wasn't an April Fools' Day joke 8-)
I think there may be switched-mode audio power amplifiers
too, but I doubt they will ever be HiFi compared with high
end linear designs.
N/
On Tuesday 05 Mar 2002 4:34 am, you wrote:
> Well, you'll have to have an A/D converter somewhere in the
> line. If the optical cable is digital, then the A/D
> converter would live in the microphone. But there isn't
> any way to remove the A/D conversion. You wouldn't need a
> D/A converter unless you wanted to playback.
>
> Digital versus analog is orthagonal to electrical versus
> optical.
>
> Taybin
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