To help identify radio signals through example sounds and waterfall images
Log periodic antennas
Printed circuit board antennas for UHF and above
By Kent Electronics
http://www.wa5vjb.com/products1.html
Wi-Spy DBx
Wifi analysis tools for 2.4 and 5 GHz networks.
by Passmark.
http://www.passmark.com/products/metageek-wi-spy-dbx.htm
Videos from Defcon 22 Wireless Village talks
Software defined radio.
At irongeek.org
http://www.irongeek.com/i.php?page=videos/defcon-wireless-village-2014/mainlist
Noise Down – sound manager alarm app
A machine to tell humans when its too loud.
By Internetics Ltd.
https://itunes.apple.com/us/app/noise-down-sound-manager-alarm/id512411644?mt=8
ook-decoder
Ook-decoder reads On-Off Keying radio data commonly used in the 433MHz ISM bands using a software defined radio (SDR).
By Jim Studt
https://github.com/jimstudt/ook-decoder
A visual microphone
Passive Recovery of Sound from Video
By Abe Davis
Article by Alex Hern at the Guardian
http://www.theguardian.com/technology/2014/aug/05/mit-crisp-packet-eavesdrop-audio-sound
Audio input with WebPd
An adc~ object for Sébastien Piquemal’s WebPd.
https://github.com/tkzic/WebPd
Try the demo (pictured above) in desktop Chrome at: http://zerokidz.com/demos/sound-check-adc/sound-check.html. The browser will ask for access to the microphone. The slider controls mic volume.
Notes on adc~ object:
**adc~** (web audio input) – Only works on Chrome desktop – partially complete. Uses 1 channel currently and no inlets on the object. This was kind of a hack. The input stream connects to a scriptNode that copies samples to a circular buffer. The scriptNode connects to a gainNode with gain value of zero, which connects to context.destination. This was the only way I could get WebAudio to pull the stream through the scriptNode.
Latency is about 3000 samples in addition to existing latency. If we find a more efficent way to buffer the samples than the hack described above…
Notes on local files 8/26/2014
After modifying any of the .js files in /lib folder, you need to re-run the ‘grunt build’ from the root folder. Then copy webpd-latest.js from /dist to the /js folder in /demos or wherever your application resides.
Audio DSP pages
Particle system based granular synthesis
By Tadej Droljc