PixeeBel

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Description

A wearable device that functions as an aid for individuals with hearing disability through visual cues. The device localizes and characterizes sound to display this on a portable, low-power screen.

The project has the following components:
a) hardware that captures audio and provides visual cues
b) software for audio processing and analytics

Details

For prototyping, we currently use a beaglebone black board. Four microphones hooked up to the board capture the audio at 8bits/sample, 9.091kHz along the 4 cardinal directions. The collected data streams in real-time are buffered on a shared memory on the board, and then analyzed on the same board (in python/C/C++). The visual cues are sent to a tiny low-power, 84px by 48px screen connected to the beagleboneblack board.

Components

2 × TL074 Amplifier and Linear ICs / Operational Amplifiers

16 × Resistance 10k (audio amplification)

4 × Resistance 330 (audio amplification)

4 × Potentiometer 10k (audio amplification: gain control)

4 × Capacitor 2.2uF (audio amplification)

Project Logs

Collapse

2 Mic amplifier circuit
sb • 09/21/2015 at 16:15 • 0 comments

Another TL074 is used with the same circuit for the remaining 2 channels.
Wiring diagram with the beaglebone is available on our github page: https://github.com/ap1/PixeeBel/blob/master/code/bbb_schematics/wiring.txt
Spectrum analyzer and real-time audio capture working
sb • 09/21/2015 at 16:00 • 0 comments

Spectrum analyzer and volume based simple direction identification running. Noise needs to be profiled and eliminated for better quality output.
Visualization on screen is working!
ahkoncha • 09/20/2015 at 22:14 • 0 comments

Visualization on screen is working!
3D printed device working
ahkoncha • 09/20/2015 at 22:13 • 0 comments

3D printed device working
Integration with Beaglebone Black working!
sb • 09/13/2015 at 01:30 • 0 comments

Finally have audio capture working on beaglebone. The code requires a lot of cleaning up and optimization. Audio capture happens in realtime by programming one of the two PRUs (microcontrollers on the processor SoC).
Helpful links for getting this working:
1. pru-sdk
https://github.com/texane/pru_sdk
2. TI PRU Code Generation Tools
http://software-dl.ti.com/codegen/non-esd/downloads/download.htm#PRU
And some sample capture data.
Graph plotted using gnuplot.
Added a video link!
ahkoncha • 08/17/2015 at 20:49 • 0 comments

Added a video link!
Entered the project in 2015 Hackaday prize!!!
ahkoncha • 08/17/2015 at 16:34 • 0 comments

Entered the project in 2015 Hackaday prize!!!
Added system design document
ahkoncha • 08/17/2015 at 16:33 • 0 comments

Added system design document.
Added component details
ahkoncha • 08/16/2015 at 06:05 • 0 comments

Added component details
Added Github repository link
ahkoncha • 08/16/2015 at 06:04 • 0 comments

Added Github repository link