Tag: software defined radio

Sox resampler library

“One-dimensional sample-rate conversion library”

By robs




Installation guide: http://sourceforge.net/p/soxr/code/ci/master/tree/INSTALL

How configure CMAKE for 32 bit architecture on Mac OS: http://stackoverflow.com/questions/5334095/cmake-multiarchitecture-compilation

Note: this command allowed building static libs for 32 bit:

<span style="color: #000000;">$ cmake -DCMAKE_OSX_ARCHITECTURES=i386 -DBUILD_SHARED_LIBS:BOOL=OFF ..</span>


local files in: tkzic/soxr-0.1.1-Source/

maxradio updates

Upgrade to Mac OS Max version.

Windows, runtime, standalone, and documentation upgrades still in progress…


This is an interim update to add new drivers.

  • driver for rtl-sdr
  • minor bug fixes




  • Connect a radio
  • Open maxsdr7a.maxpat 

note: 1/23/2015 – the repository was really messed up – missing externals, etc., have reloaded. The local source is now at tkzic/maxradio

ep-4yy13 DSP – week 13

“I think its just the biggest conceptual art project uninentional or otherwise that anyone ever made. it puts Christo and those other guys to shame. Its planetary”

Roman Mars “Episode 97 – Numbers Stations” from 99% Invisible


  • Measuring the invisible
  • What is the difference between sound waves and radio waves?
  • What is an antenna?
  • Wave propagation is frequency dependent
  • Sunspots and magnetic fields http://spaceweather.com
  • Extreme frequencies, negative frequencies?


Internet radio streams and recordings

Frequencies and modes
  • Macbook trackpad: Noise 5 mHz. (try holding radio near screen too)
  • Macbook AC adapter: Noise 600-1400 kHz. (~1000)
  • AC adapters, LED’s, Utility poles: 3.2 Khz
  • Arduino transmitter: AM 1330 kHz.
  • Laser light at 650nM
  • Wireless micorophone (Orange-brown): Wide FM 614.150 MHz. (R band)
  • Cordless phone: Narrow FM 926 mHz.
  • Cell phone: Digitally encrypted trunking FM 836 mHz.
  • Wifi: Digitally encoded PCM 2.4 gHz.
  • FM broadcast band: Wide FM 89.7 mHz (Raspberry Pi example 98.1 Mhz)
  • TV audio 600 mhz/660 mhz FMW
  • The sun http://www.ips.gov.au/Solar/3/4

Topics not covered

(due to snow and stuff)



  • d3
  • processing
  • jitter
  • hardware control




Please send me a copies of your earlier compositions. Have a prototype ready to demonstrate or talk about for the next class.