Ambi-Alice has entered the rabbit hole of surround sound microphones

In theory, the Ambisonic microphone allows you to perfectly encode the surrounding soundscape and recreate it from a focal point in any direction. For this, you need at least four microphone capsules and some mathematical knowledge.Surround microphones have been around for 50 years, but [DJJules] Hope to bring ease of use to these tools and push them into the open source field.

As you will see in the video below, there are some iterations before this.When everything gets better [DJJules] TSB25905 capsules were found. These are electret condenser microphones with a 1-inch diaphragm and built-in EMI/RFI suppression capacitors. Another great help was the decision to color-code everything from the XLR cable sleeve to the cable sleeve to the electrical tape that protects each P48 resistor-capacitor pair in the XLR plug.

[DJJules]’ partner [Tom] A single piece fixing the four poles in a perfect tetrahedral array was designed and printed, as well as an elegant two-piece basket to protect the microphone and provide a base for one of the furry windshields. The microphone and the basket are separated by four silicone plugs specially designed for quadcopter to provide isolation and vibration reduction functions.

If you want to make one of them yourself, [DJJules] There are STL for normal microphone stand and GoPro stand. Check out the construction video and the sound demo on Instructables after the break.

Don’t need a rich soundscape? Instead build a USB microphone, or if it is too cold and modern, sharpen a wooden ribbon microphone.