Go Back   Home > Forums > >
Home Forums Rules Articles diyAudio Store Blogs Gallery Wiki Register Donations FAQ Calendar Search Today's Posts Mark Forums Read

Everything Else Anything related to audio / video / electronics etc) BUT remember- we have many new forums where your thread may now fit! .... Parts, Equipment & Tools, Construction Tips, Software Tools......

First post and need help: Creating Binaural Mic!
First post and need help: Creating Binaural Mic!
Please consider donating to help us continue to serve you.

Ads on/off / Custom Title / More PMs / More album space / Advanced printing & mass image saving
Thread Tools Search this Thread
Old 12th April 2006, 10:57 AM   #1
Prismatic is offline Prismatic  United States
diyAudio Member
Join Date: Apr 2006
Location: San Diego, CA
Default First post and need help: Creating Binaural Mic!

Howdy! Ive been to these forums in the past but never registered until now I'm creating a set of binaural microphones but have run into a problem.

This is a simple binaural mic design, basically it involves taking some headphones and replacing the speakers with microphones. The site im following for a guide is here: http://art.simon.tripod.com/stealth.html
Now, im using earbuds for this since they hide better, and it's going well sofar. I have the left mic working but the right one does not seem to be responding to anything.

The left mic is wired up like this:
Click the image to open in full size.

That works, I can pick up sound from it when plugged in.

The right side is wired exactly the same way, but nothing is being picked up by it. My PC's microphone jack is mono, yes, but shouldn't it combine both mic inputs into one, so when I make a noise in either mics I should get some kind of a response?

The wording of the site is odd, they say this:

"Solder the bare wire from the left headphone speaker to the ground wire on the mic element that will be installed in the right earphone."

Why would I solder something I intend to place in the left ear to something intended for the right? It makes no sense at all

Anyone able to help me out with this? How exactly should I be wireing my mics

Note: The speaker is no longer attached, my picture is just showing what wires I used from the speaker connection.

Thanks for the help
  Reply With Quote
Old 12th April 2006, 11:51 PM   #2
Ron E is offline Ron E  United States
diyAudio Member
Ron E's Avatar
Join Date: Jun 2002
Location: USA, MN
What are you plugging the resulting stereo microphone into? Most PC sound card microphone inputs are not stereo and only one channel will work.

It looks to me like the bare wire (shield) should be on the ground of the mic capsule and the center conductor should be on the other mic terminal, for both sides.

IMO wearing these on your head you are going to end up recording a lot of body noises/heartbeats/ rustling clothes / hair scratching. Binaural mics are also possible using NERF balls and the like or even a dummy head with casts of your own ears
Our species needs, and deserves, a citizenry with minds wide awake and a basic understanding of how the world works. --Carl Sagan
Armaments, universal debt, and planned obsolescence--those are the three pillars of Western prosperity. Aldous Huxley
  Reply With Quote
Old 13th April 2006, 01:22 AM   #3
Prismatic is offline Prismatic  United States
diyAudio Member
Join Date: Apr 2006
Location: San Diego, CA
Thanks for the help ron

I origonally had a styrofoam ball made and everything but I figured it would look extremely weird walking around with a fake head in toe =P

Mics placed inside the ears can sound quite good, actually.. Here is a site with a ton of recordings made with in-ear mics: http://binaural.jimtreats.com/

When I had the head made, I had both mics wired up like this:

Click the image to open in full size.

With that setup I would get sound on both mics when I made a noise (even though my PC mic in is mono) So I figured that it must just combine channels.

So you are saying I did it right? I SHOULD only get sound from ONE mic when plugged into a mono port and not from both merged to single channel?

hope i'm not too confusing
  Reply With Quote
Old 14th April 2006, 02:52 AM   #4
Eva is offline Eva  Spain
diyAudio Member
Eva's Avatar
Join Date: Oct 2003
Location: Near the sea
Send a message via MSN to Eva
A stereo microphone jack does not imply the existence of two channels. The extra ring contact in the jack is used for phantom power, it's internally connected to +5V through a 1K resistor in nearly all soundcards. Also, Nearly all commercial PC condenser microphones wire the tip and the ring together internally (to bias the capsule), while dynamic microphones use a mono jack thus shorting the ring to ground (harmless thanks to the 1K internal resistor).

If your microphone is of electret/condenser type, you will also have to connect it to both tip and ring at the same time. Note that you *can't* connect two microphones to such an input without previously mixing the signals externally, and even that will be quite pointless. Furthermore, condenser capsules may be internally buffered and are not usually intended to be paralleled.

The point of binaural microphones is to record the sound as perceived in two different locations, so that it can be played back in stereo to recreate all the natural spatial effects. If you mix those two channels, the result will end up sounding quire worse than a single channel due to comb-filtering, never do that. You will have to get or build a simple stereo microphone preamplifier (preferably with some built-in limiter) and connect its output to the line input of the PC sound card in order to achieve stereo mic recording. Also, note that the microphone preamplifier built into most PC soundcards is full of noise and distortion, so it's worth the effort to use an external one.
  Reply With Quote
Old 14th April 2006, 06:20 AM   #5
Prismatic is offline Prismatic  United States
diyAudio Member
Join Date: Apr 2006
Location: San Diego, CA
Well yeah I know im going to need a pre-amp, a guy on ebay is going to build me a battery box with a pre-amp circut built in for $30.

So I cant take a pair of simple headphones, clip out the speakers and solder in some mic's in their place to get a binaural recording? Is that what you are saying?
  Reply With Quote
Old 31st July 2010, 03:37 PM   #6
lisah is offline lisah
diyAudio Member
Join Date: Jul 2010
Hi all

wondering if you can help, i am also trying to build some binaurals... found the same website as above, but was also looking at this one ; Binaural Microphone Construction as it includes how to make the battery pack.

Only problem is, i am a bit new to this -i can solder, but i cant understand the diagram on how to put it together ... would anyone be able to translate it to me into a more idiot proof version / text / mic? or is it already at it's most basic?!
  Reply With Quote


First post and need help: Creating Binaural Mic!Hide this!Advertise here!
Thread Tools Search this Thread
Search this Thread:

Advanced Search

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off

Forum Jump

Similar Threads
Thread Thread Starter Forum Replies Last Post
Binaural recording: alternatives to expensive dummy heads? KT Everything Else 14 10th June 2015 09:00 AM
Binaural recording of 4th of July fireworks zapnspark Everything Else 34 8th July 2008 11:31 PM
Stereo binaural WM-61A with preamps AdamZuf Everything Else 21 30th December 2006 05:34 AM
Stereo to binaural and crosstalk cancellation Nixie Digital Source 0 8th February 2006 01:34 PM
WTB: Binaural Recordings drewm1980 Swap Meet 0 9th August 2005 10:55 PM

New To Site? Need Help?

All times are GMT. The time now is 07:18 PM.

Search Engine Optimisation provided by DragonByte SEO (Pro) - vBulletin Mods & Addons Copyright © 2017 DragonByte Technologies Ltd.
Resources saved on this page: MySQL 16.67%
vBulletin Optimisation provided by vB Optimise (Pro) - vBulletin Mods & Addons Copyright © 2017 DragonByte Technologies Ltd.
Copyright ©1999-2017 diyAudio