microphones and the cirrus audio card

There is definitely a microphone bias circuit in the schematics, and even a script to enable recording from a biased microphone.  But I tried just now and couldn't actually measure any bias voltage.on the line-in connector.

Ok Great - thanks Tim

so maybe it has to be enabled?

bw

grant

Hello Grant, et al..

The thought of "this could get interesting" came to mind when I realised that with a fresh image, network connection and power on, you would be streaming, if it were to be popular to download ...... When I realised this, I was very conscious of being switched on, and on-line - hence my swift move.

"The soundmap itself is a specific project, with specific parameters, described here http://locusonus.org/ -Locustream

It's a long standing project (not mine), and isn't intended to include eg conventional radio material, recordings, musical performance, etc"

This sounds like the perfect place for my binaural microphones!! This is very much NOT a conventional way to record things or to have streaming live, and is something I have been looking for many months. If anyone cares to have a listen to any of my binaural recordings, and see what "Frank the terrorist" has been upto please wear your best headphones and click here: https://soundcloud.com/binauralhead you can also see what I have been up to on the blog, address is on the soundcloud channel, if you read the full profile on "Frank".

Having the raspberry Pi in a bag (or anywhere), with battery and 3G/4G dongle and a "binaural microphone" .. would, for me, be quite something, esp if there was a dedicated website that had many binaural microphones placed about the globe, to experience being there would be totally awesome. Unless you have experienced listening with headphones what binaural audio is, you will have no idea what I am on about.

If it were not for people like Grant, and the people who are doing the microphone project, I would not be so excited with this idea, and it would probably never have happened for me. In the last 12 months of being interested with binaural audio I have met, quite by chance, some very famous people, and been to famous film studios with both my dummy head microphones - all were totally awesome experiences!!

Being able to listen to an audio stream that has very good quality, live (or recorded) from your iPhone, MAC or PC, Library or on-line radio station is just as good, if not better than 3D vision! and if combined...

I feel that something very good could come of this, and if not, it's something that keeps me interested with sound, the raspberry pi, and new people to talk with, who could want for anything more?

Slice of Pi anyone?

Regards

Alan

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)

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 :-)

Hi Grant,

Did this mic, Primo EM-172 , work?

Thanks

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

Hey, there are only birds to hear? What kinda channel is this? ;-))

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

With a dummy head? Or are u using the mics on the audio card?

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

Cool project. Sounds very interesting.

Regards

Georg

Cool project. Sounds very interesting.

Regards

Georg