Sen descrición

Fernando Pablo Lopez-Lezcano 119baa4d84 remove windscreen components from the TinySpHEAR_mount_pcb file		%!s(int64=9) %!d(string=hai) anos
attic	0dfe14d5cd move old calibration 3d model directory to attic (unused stuff)	%!s(int64=10) %!d(string=hai) anos
calibration	514e1b61a7 add bash script to convert H2N XY/MS files to a four channel A format file	%!s(int64=9) %!d(string=hai) anos
doc	4f7f1dd167 a few changes and additions to the "building the microphone" document	%!s(int64=9) %!d(string=hai) anos
pcb	f6a275ed95 zapnspark: transform molex pin connector pads into smd pads to solder wires directly to the pcb instead of using connectors, should make it slightly easier to assemble the microphone; manually update the component location pdf and svg with new locations	%!s(int64=10) %!d(string=hai) anos
pictures	67b476c7a5 rotate pictures, adjust width of pictures in page	%!s(int64=10) %!d(string=hai) anos
.gitignore	ad103a6c45 ignore stl, gcode and backup files in local copy	%!s(int64=9) %!d(string=hai) anos
BigSpHEAR.scad	80c64a6157 add initial 12 capsule design to repository	%!s(int64=11) %!d(string=hai) anos
BigSpHEAR_20.scad	3f64d66464 the leg slots have now the correct depth, it does fix the big sphere build process, also separate more the individual pieces for the print otherwise some of the connecting legs get messed up	%!s(int64=11) %!d(string=hai) anos
CCRMA_logo.scad	357524d3bf fixed 2-manifold issue with logo by splitting one of the polygons	%!s(int64=10) %!d(string=hai) anos
Octathingy.scad	eefa3b97fa push the latest (very old) changes to the Octathingy design	%!s(int64=10) %!d(string=hai) anos
Octathingy_EM182.scad	dbbd6904fb add triangular legs as a default for EM182 and EM200 Octathingy	%!s(int64=9) %!d(string=hai) anos
Octathingy_EM200.scad	a25bc7225d complete redesign of the body of the Octathingy, all eight phantom power interfaces are now arranged radially instead of in two groups of four, this makes the body symmetrical and less ugly but it is still very bulky as before - this will also make it easier to incorporate a windscreen mount	%!s(int64=9) %!d(string=hai) anos
Octathingy_common.scad	b1a284bc77 add Octathingy model with a microphone mount for the zapnspark boards	%!s(int64=10) %!d(string=hai) anos
Octathingy_mount_pcb.scad	e5018bbe57 remove old rectangular body and flare octathingy code	%!s(int64=9) %!d(string=hai) anos
README.md	b5463e2760 added very brief descriptions of the PCB design and calibration software	%!s(int64=10) %!d(string=hai) anos
SpHEAR_common.scad	4c27b20bd7 add code to capsule module to be able to render the modified array mount with a fully symmetrical array (all capsules with three standard horizontal legs)	%!s(int64=9) %!d(string=hai) anos
SpHEAR_windscreen.scad	4df9474e70 add windscreen code to render upper and lower windscreen frames, add thread cover, lower facets for rendering helixes to use less memory, move some parameters to the windscreen file	%!s(int64=9) %!d(string=hai) anos
TestRig.scad	de02365217 add a parameter to the capsule module so that we can make the slot in the mount narrower for a tighter fit, test rig: first test prints of the parts, tweak tolerances so that all pieces fit together, I need to adjust the length of the stalk and the size of the adapter so that the stalk does not move and the skirt is longer so that it grabs better the mount cylinder - the concept works fine and the stop for 0 and 90 degrees works as intended	%!s(int64=10) %!d(string=hai) anos
TinySpHEAR_EM182.scad	e9c90c04e0 add triangular legs as a default for EM182 and EM200 tetrahedral arrays	%!s(int64=9) %!d(string=hai) anos
TinySpHEAR_EM200.scad	ccbb2e3b20 sphear windscreen improvements, switch to a thread based attachment of the windscreen to the microphone, many fixes, add render functions, modify em200 version to render the full microphone including the windscreen	%!s(int64=9) %!d(string=hai) anos
TinySpHEAR_H2N_EM200.scad	e4f117f019 split H2N EM200 rendering to a separate file (like for other microphones), change rendering of the body of the H2N array so that we can mount a windscreen on it (leave old stuff as _no_ws modules for now), make the windscreen the same as for the SpHEAR EM200 standalone microphone	%!s(int64=9) %!d(string=hai) anos
TinySpHEAR_H2N_common.scad	e4f117f019 split H2N EM200 rendering to a separate file (like for other microphones), change rendering of the body of the H2N array so that we can mount a windscreen on it (leave old stuff as _no_ws modules for now), make the windscreen the same as for the SpHEAR EM200 standalone microphone	%!s(int64=9) %!d(string=hai) anos
TinySpHEAR_common.scad	fa83090c8e render a tetrahedral capsule array with all capsules having three standard horizontal legs, they all interlock much better than before and the geometry of the array is almost perfect without having to visually look at it while glueing the capsules together	%!s(int64=9) %!d(string=hai) anos
TinySpHEAR_mount_pcb.scad	119baa4d84 remove windscreen components from the TinySpHEAR_mount_pcb file	%!s(int64=9) %!d(string=hai) anos
TinySphEAR.scad	3f6a270667 really push changes to TinySpHEAR_common.scad, TinySpHEAR_mount_pcb.scad and TinySphEAR.scad	%!s(int64=10) %!d(string=hai) anos
threads.scad	362edf83c1 h2n: wind screen support with three rings, add code for splitting the microphone stalk and capsule array mount from the bridge so that the capsule array can be separated from the the recorder body without making the whole system too big - includes threads for 8 pin mini-XLR connectors that couple the bridge to the stalk and array	%!s(int64=9) %!d(string=hai) anos

The *SpHEAR Project

The *SpHEAR (Spherical Harmonics Ear) Project is a collection of 3D models and ssociated code for building, testing and calibrating full surround Ambisonics microphones. All 3D models are written in Openscad with the code licensed under the GPL 3+ license (GNU Public License version 3 or higher), and the 3D models licensed under the Creative Commons Attribution-NonCommercial-ShareAlike 4.0 International license.

The 3D models are almost completely parametric and are designed to be able to be printed on low cost widely available 3D printers (at CCRMA we use an Ultimaker 2 Extended Plus printer, using PLA material). The design is modular and tries to avoid using overhangs and support structures. That is why each microphone assembly is made of a number of independently printed capsule holders interconnected by legs that interlock and hold the structure together. The capsule holders and the mount are glued together to create a 3D structure that securely holds all microphone capsules. A mount that can be clipped into a standard microphone stand is part of the design.

Mailing list

You can subscribe to a development mailing list (sphear-devel@ccrma.stanford.edu) here: https://cm-mail.stanford.edu/mailman/listinfo/sphear-devel

About building microphones

Successfully printing a microphone assembly is only the first step in a long and complicated process. This also includes finding and buying the required microphone capsules, assembling the electronics (requires precision skill with the soldering iron) and finally calibrating the multi-capsule microphone to get the best performance out of it (you will need at least a single driver sound source and a calibrated microphone).

The whole process is not easy and requires knowledge of acoustics and electronics, plus a healthy dose of patience and the ability to perform tasks with precision and care. This repository will eventually include more detailed instructions, electronic schematics, suggested and tested parts and software and procedures for calibrating and measuring the microphone, including models for test and calibration rigs.

3D models

The 3D models currently include the TinySpHEAR, a four capsule first order Ambisonics microphone, the Octathingy, an eight capsule second order design by Eric Benjamin and Aaron Heller and preliminary designs for 12 and 20 capsule designs (the BigSpHEAR_12 and BigSpHEAR_20 models). The models will be expanded as testing proceeds.

TinySpHEAR: four capsule first order microphone with simple stand mount
- TinySpHEAR Zapnspark: four capsule first order microphone with four Zapnspark phantom power interfaces and shock mount
[Octathingy](): eight capsule microphone (proof of concept so far)
[BigSpHEAR_12 / BigSpHEAR_20](): 12 and 20 capsule designs (proof of concept)

Electronics

The pcb/zapnspark directory contains the Kicad electrical circuit and printed circuit board design for the Zapnspark phantom power interface. The current printed circuit board design fits into four slots carved inside the body of the TinySpHEAR plus Zapnspark model. Everything is dimensioned for the sizes of the components specified in the parts list, any changes (specially the diameter of the electrolytic capacitors) would need to be taken into account by changing appropriate model parameters.

Calibration

The calibration/src directory contains the Octave files for the current calibration software. The CALIBRATION.md file in there has a very brief description of usage, but currently is out of date with the current source code. Look into the individual files for more guidance. Hopefully this will be fixed soon.

README.md