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Author Topic: Mems microphone lavalier style ( tie/shirt clip microphones )  (Read 789 times)
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I've got a little project using the Mems microphone here on Sparkfun ADMP401, i 'm asking about feasability. it's a diy Lavalie microphone ( the ones you clip to tie, or shirts for Interview )
I need the microphone to output to a mcu which will then send via RF ( 2.4 ghz) to a receiver which ll do the DAC conversion to an xlr output.

Is it easy ? i know the transmitter mcu should do some "processing" and the receiver some amplifier, what are my best options ?

Regards
J.
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I've got a little project using the Mems microphone here on Sparkfun ADMP401, i 'm asking about feasability. it's a diy Lavalie microphone ( the ones you clip to tie, or shirts for Interview )
I need the microphone to output to a mcu which will then send via RF ( 2.4 ghz) to a receiver which ll do the DAC conversion to an xlr output.

Is it easy ? i know the transmitter mcu should do some "processing" and the receiver some amplifier, what are my best options ?

Regards
J.
So, basically, you're talking about a digital wireless mic? No, not easy if you expect it to be reliable and not especially inexpensive either. You need to fill in some blanks here before you will get any advice other than speculation.
For starters:
  • What bandwidth do you require?
  • What range do you require?
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Yeah...   Nothing about that is easy...

I wouldn't recommend building an RF transmitter/receiver yourself.  RF is a specialty area and doing it right would require an oscilloscope, a frequency counter, and probably an RF spectrum analyzer and a signal generator.    Just renting that kind of equipment would cost more than a good wireless mic set-up.

As far as digital signal processing, that's going to take a fairly high-power processor (assuming you want good audio quality) or a special-purpose DSP chip.   If you've done some DSP before, that might not be a big deal.   But if you haven't, you are probably looking at a few months of study.   And, you might have to invest in a software/hardware development kit once you choose a processor.

Other than the mic preamp, building an ADC & DAC are probably the easiest part.  But, I wouldn't say "easy"...     So, you might look into that first.    If you think you can handle that, you might look into the RF & DSP aspects.
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i know it's not a easy task, For the RF problem, are you saying that existing rf setup like xbee couldn't do the job or bigger range module like 5.8ghz seen in A/V transmission from remote to rc plane are not "robust" enough ?
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i know it's not a easy task, For the RF problem, are you saying that existing rf setup like xbee couldn't do the job or bigger range module like 5.8ghz seen in A/V transmission from remote to rc plane are not "robust" enough ?


Xbee is designed for packets, not a stream of data. Don't know about the other. Is it analog or digital?
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