https://github.com/lcav/compactsix
A compact array with 6 MEMS microphones relying on the BeagleBoneBlack and the STA321MP audio processor.
https://github.com/lcav/compactsix
Last synced: 11 months ago
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A compact array with 6 MEMS microphones relying on the BeagleBoneBlack and the STA321MP audio processor.
- Host: GitHub
- URL: https://github.com/lcav/compactsix
- Owner: LCAV
- Created: 2015-12-01T14:42:53.000Z (over 10 years ago)
- Default Branch: master
- Last Pushed: 2018-10-11T02:31:56.000Z (over 7 years ago)
- Last Synced: 2025-04-15T12:17:45.721Z (about 1 year ago)
- Language: Python
- Size: 585 KB
- Stars: 16
- Watchers: 8
- Forks: 2
- Open Issues: 0
-
Metadata Files:
- Readme: README.md
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README
CompactSix
==========
A six channel compact microphone array based on the Beaglebone Black and the STA321MP audio processor.
Bill of Materials
-----------------
The full BOM is in file `pcb/CompactSix_BOM.txt` but here is a list for minimal functionnalities.
For the BBB cape with the Audio Processor:
* 1x STA321MP Audio processor (Mouser 511-STA321MPLTR)
* 1x 12.288MHz oscillator (Mouser 732-SG210STF12.288S3)
* 1x Micromatch Female-On-Board SMD 10 pin connector (Mouser 571-8-2178711-0)
* 3x 0 Ohm Resistor, 0805 package
* 2x 100 Ohm resistors, 0805 package
* 5x 10K Ohm resistors, 0805 package
* 1x 1uF capacitors, 0805 package
* 8x 100nF capacitors, 0805 package
* 1x 10nF capacitors, 0805 package
* 1x 1nF capacitors, 0805 package
* 1x 10pF capacitors, 0805 package
* 2x pin headers 2x40, 2.54mm spaced
Currently, we do not need the audio amplifier at all so that part can be left out.
To add the RTC and the temperature sensor, add the following:
* 1x Temperature sensor TMP275 (Mouser 595-TMP275AIDR)
* 1x RTC DS1338 (Mouser 700-DS1338Z-33T&R)
* 1x CR2032 Battery holder (Mouser 712-BAT-HLD-001)
* 1x 32.768 kHz crystal (Mouser 815-ABS07-32.768KHZT)
* 2x 100nF capacitor
* 1x 10K Ohm resistor
For the six small microphone boards:
* 6x SPM1437HM4H-B PDM MEMS Microphones (Mouser 721-SPM1437HM4H-B)
* 6x 100nF capacitors, 0805 package
For the cable:
* 1x Micromatch Male-On-Wire 10 pin connector (Mouser 571-12150830)
* 30cm flat cable, 1.27mm, 10 wires
Hardware Configuration
----------------------
There are three options that can be configured using resistors.
1. *XTI source* The master clock for the STA321MP audio processor can be supplied
either from the a crystal oscillator or from the McASP module from the BBB.
The configuration is marked as `XTI` on the PCB. The crystal oscillator is
selected by shorting the pads on the `OSC_CK` side. The McASP clock by
shorting the `MCLK` pads.
2. *Oscillator Enable* In case the master clock is supplied by the processor
directly, it is possible to turn off the crystal oscillator.
The configuration is marked as `OSC_EN` on the PCB. The crystal oscillator is
turned off by shorting the pads marked `gnd`, and turned on by shorting the pads
marked `vcc`.
3. *Mic clock* This option allows to give a clock 4x slower to the microphones.
The configuration is marked as `MIC_CK`. This option is not used at the
moment and the pads marked `CKOUT` should be shorted.
Dependencies
------------
* A modifed linux kernel should be used. It can be found in another [repo](https://github.com/fakufaku/linux/tree/epfl-3.14-sta321mp) (branch `epfl-3.14-sta321mp`).
* A modified Device Tree Blob found in this [repo](https://github.com/fakufaku/dtb-rebuilder/tree/3.14-ti-sta321mp) (branch `3.14-ti-sta321mp`).
Reuse
-----
All the hardware is under
[CC-BY-SA 4.0](https://creativecommons.org/licenses/by-sa/4.0/) license. If you
reuse some of this stuff in an academic context, please cite our
[demo proposal](https://doi.org/10.1109/ICASSP.2017.8005297) from ICASSP 2017.
> E. Bezzam, R. Scheibler, J. Azcarreta, H. Pan, M. Simeoni, R. Beuchat, P. Hurley, B. Bruneau, C. Ferry, and S. Kashani,
_Hardware and software for reproducible research in audio array signal processing_,
Proc. IEEE ICASSP, New Orleans, LA, USA, 2017, pp. 6591--6592.
DOI: 10.1109/ICASSP.2017.8005297