Motional Feedback Loudspeakers - Optical

[sacci]

What I need to know about the use of optics in MFB. There are a few
references to it around on newsgroups and forums but as far as I can
fathom, no concrete material is available, or any development of the
idea.

I'd like to know of anyone that has attempted to use this idea, what
system they have used etc and whether there is any advantage over this as
opposed to say using an accelerometer. The only way I can see this being
an advantage is that there would be no mass affecting the movement of the
cone, and the main disadvantage being more circuitry to contend with!

I would imagine that the signal being produced by any form of mechanical
or optical 'pickup' would by and large be the same or similar and
therefore could be incorporated into an existing MFB system? I'm not
sure, what do you think?

I'll keep on looking!

Cheers

Tim

 

[Ian Stirling]

sacci <me@home.com> wrote:

What I need to know about the use of optics in MFB. There are a few
references to it around on newsgroups and forums but as far as I can
fathom, no concrete material is available, or any development of the
idea.

Unless things change (the damping of the speaker enclosure, ...) then
you can achieve similar results with DSP.