microphones and the cirrus audio card

I want to use stereo electret condenser microphones with this card. They need a a bias voltage (Plug in Power) of around 5V.

The Wolfson only included mono microphone support through the Mic in plug.

The comparison table for the Cirrus says it supports stereo microphones through the Line in, and the video introduction to the card mentions that bias voltage is provided for electret condenser microphones, but doesn't give more detail.

It would be great to have confirmation of what exactly this card provides in this direction.

This is important because it decides if the card enables the Pi to be used as a high quality audio recorder without an additional soundcard - as the Wolfson sadly could not.

Thanks

Grant (soundCamp)

soundcamp over 11 years ago in reply to binauralhead

Hi Alan
This all sounds good. It's great we're on the same wavelength.
Happy to discuss more about live streaming, maybe off- list - we may be straying from the theme..

BTW if you're working with the image, you can disable the auto streaming darkice feature by renaming the file:

Desktop/stream_settings/run_on_boot/start_stream.sh

to something else.

bw
grant (soundtent.org)
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e14 Contributor over 11 years ago in reply to soundcamp

These big images are a waste of time in my opinion. The only thing you need is a kernel (with realtime capabilities) Here is 3.12.33 for the os of YOUR choice.
https://blog.georgmill.de/2015/02/18/update-for-wolfson-audio-card-on-raspberry-pi/

Have fun :-)
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e14 Contributor over 11 years ago in reply to soundcamp

Hi Grant,

Did this mic, Primo EM-172 , work?

Thanks
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binauralhead over 11 years ago in reply to soundcamp

Hi Grant -- et al

Just a quick message on here if others have been following the thread.

Up and running (at present) with the Cirrus Logic audio card here: Lan2Lan.no-ip.com (images & info).
link to audio stream here: http://locus.creacast.com:9001/liverpool_ormskirk

Thank you to those who made this real for me.
Regards
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e14 Contributor over 11 years ago in reply to binauralhead

Hey, there are only birds to hear? What kinda channel is this? ;-))
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binauralhead over 11 years ago in reply to e14 Contributor

This is binaural audio - only ever realised when the listener wears headphones.
Bad weather out there just now, but you should be able to tell what is above you and below the head, lots of things happen in this garden, but not all of the time. On test at present, testing the cirrus logic card. Aircraft sound interesting
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e14 Contributor over 11 years ago in reply to binauralhead

With a dummy head? Or are u using the mics on the audio card?
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binauralhead over 11 years ago in reply to e14 Contributor

With a home made dummy head (with external mics going through the line in on the card) - see Lan2Lan.no-ip.com for images and more info - it's an on going project, this one uses 3D printed ears of my own ears, their not quite a realistic plaster cast of them, but I have a set of those as well.

I've now managed to replace one of the mics on the dummy head in the garden and set the levels correctly.

Noise levels on the cirrus logic audio card seem excellent, as I can't seem to hear any through the line in socket. I've not tried the built in mics, or used any other features, just the line in

Regards
Alan
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e14 Contributor over 11 years ago in reply to binauralhead

Cool project. Sounds very interesting.
Regards
Georg
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e14 Contributor over 10 years ago

hi every one,,,I am using a TEA5767 tuner to feed the output in to cirrus audio logic card from LINE IN ...the input sound is recorded and able to make a file .........................I want to listen live audio input which is going in to LINE in from other port.....the other port may be LINE OUT..... is it possible,,,,,please help,,,,,,,,
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