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#1
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Interesting reading: using MEMS Accelerometers as acoustic pickups
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#2
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Interesting reading: using MEMS Accelerometers as acousticpickups
Mark (makolber) wrote:
http://www.analog.com/library/analog...rchives/43-02/ mems_microphones.html Thanks. I'd looked into this years ago, and was quickly turned off by the frequency response curve and noise of the accelerometers that were available at the time. It's interesting to read the paper, to see the idea explored a little. They've come out with some better products than the ones I read about before, and maybe someday they will be practical for "pro audio" applications. I only vaguely remember what I had learned about the basic technology -- getting a sufficiently low noise floor from the devices may be difficult(?). Jay Ts -- To contact me, use this web page: http://www.jayts.com/contact.php |
#4
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Interesting reading: using MEMS Accelerometers as acoustic pickups
On Thu, 05 Feb 2009 23:45:35 -0500, Ben Bradley
wrote: On Thu, 5 Feb 2009 06:56:38 -0800 (PST), wrote: http://www.analog.com/library/analog...crophones.html I'm reading through this, the article talks about Jimi Hendrix and feedback leading up to this, but still ... I'm trying really hard to ignore this: "Figure 7. Accelerometer mounted on Fender Stratocaster acoustic guitar." I know they've been making Strats for over a half century, but somehow I missed the introduction of the acoustic model. I did find this Fender "Stratacoustic" model, but still, you'd think they'd find some model of Martin to put this on. Or maybe they didn't want to risk scratching up a Martin by attaching things to it. http://www.fender.com/products//sear...tno=0967400306 Mark |
#5
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Interesting reading: using MEMS Accelerometers as acoustic pickups
wrote in message
http://www.analog.com/library/analog...crophones.html What they don't talk about is dynamic range for acoustical inputs. Probably not all that good. Accelerometers have been used as feedback elements for loudspeakers for several decades. Traditional accelerometers have been relatively massy, which limits their use at frequencies above 100 Hz. Accelerometer sensing based inverse feedback works. Those traditional accelerometers have had good response to at least 1 KHz, but their mass was the stumbling block. These look like they may be far lighter. I suspect that accelerometers would find their way into more speakers if they were less expensive and could provide stable results to say 600 to 2000 Hz. |
#6
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Interesting reading: using MEMS Accelerometers as acousticpickups
On Feb 6, 7:38*am, "Arny Krueger" wrote:
wrote in message http://www.analog.com/library/analog...3-02/mems_micr... What they don't talk about is dynamic range for acoustical inputs. Probably not all that good. Accelerometers have been used as feedback elements for loudspeakers for several decades. Traditional accelerometers have been relatively massy, which limits their use at frequencies above 100 Hz. * Accelerometer sensing based inverse feedback works. Those traditional accelerometers have had good response to at least 1 KHz, but their mass was the stumbling block. These look like they may be far lighter. *I suspect that accelerometers would find their way into more speakers if they were less expensive and could provide stable results to say 600 to 2000 Hz. Arny, that's a good point, the new MEMs devices might make speaker linearization w/ feedback more practical then it was in the past. Mark |
#7
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Interesting reading: using MEMS Accelerometers as acoustic pickups
Arny Krueger wrote:
wrote in message http://www.analog.com/library/analog...crophones.html What they don't talk about is dynamic range for acoustical inputs. Probably not all that good. It's not, really, but it gets better every day. The dynamic range issues on the MEMS microphones are pretty severe because of the small area of the diaphragm, and the low mass of the accelerometer beams cause similar issues. In most accelerometer applications, though, bandlimiting can help improve dynamic range. And a lot of these are being used in go/no go applications like firing off automotive airbags rather than in applications requiring low noise and high linearity like inertial navigation systems. Those traditional accelerometers have had good response to at least 1 KHz, but their mass was the stumbling block. These look like they may be far lighter. I suspect that accelerometers would find their way into more speakers if they were less expensive and could provide stable results to say 600 to 2000 Hz. Yes, the Velodyne feedback subwoofers have been using MEMS accelerometers for a few years now. It's a good choice for the application. You are starting to see MEMS microphones being used in cellphones as well, because they can be designed with A/D conversion directly on the same chip as the microphone, and because they perform better in high humidity and when actually wet than do electrets. --scott -- "C'est un Nagra. C'est suisse, et tres, tres precis." |
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