Binuaral Mic headset
Sunday, February 17th, 2008One component for of my thesis is the gathering of city sounds and presenting them on my SoundandtheCity website. As expected I new this would be a challenge given the time and scope. So I just need to get started. First I purchased a HD recorder for the audio. I picked up the Zoom H2 recorder because of its high quality and praised user feedback.
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H2 Handy Recorder, 360 sound field, great for multiple applications and supports mp3 and wave formats along with 44.1/48/96kHz sample rates. Great menu options and stores audio to SD card… It also supports external microphones which is key for my binaural mic. |
It’s a light unit, runs on two portable batteries - I am using rechargeable Nickel-Metal Hydride batteries - and has a great stereo field. My first test in the streets revealed some flaws in my method of discrete, quick, and casual recording. Because I wanted to record the sounds with a human perspective I had to hold the unit at heads height. There goes trying to be discrete. It was also tiring to my arm and was hard to monitor the signal on the screen. I need something hands free so I decided to make a Binaural Mic Headset.
Sidenote: Binaural microphones are miniature Omni-directional microphones, used in pairs, placed on either side of a human (or artificial) head and placed in, or as near as possible to, the ears. Omnidirectional mics pick up sound in all directional fairly equally, so when they are used in this manner, they pick up sound very much like the human ear does. Note: These same microphones are also capable of making stereo recordings — Sound Professionals.com
First step was to find and take apart and old pair of headphones.
Next I rounded up some mic capsules I took out from old answering machines. I figured they should be fine for a first draft.
You can also get these at your local RadioShack.
I then unsoldered the contacts from the headphone speakers and soldered the connecters onto the microphones. Always remember to pay attention to the ground wire…
After testing the mics - quality control - I then proceeded to make holes in the headphones for the capsules. I used a drill bit the size of the capsule and worked it till I got the result I wanted.
Next I fitted the capsules in place and, because I was lucky was able to re-attach the speakers to the headphones making a seamless connection.
Now I can record with a bit more discretion and monitor my signals. i can also have my hands free to take photos, part of the project, and make notes.
Look forward to more updates, hopefully with my standalone mannequin’s head.
Allistar
