OS Research

Random stuff. Previous project: 30 days of watches.
Approaching Nirvana

—Fade Away (Extended Mix)

유카리(Yukari)

—04 Hang On

Ark Patrol

—Emperor/Hello Universe

AVR PSK31 on Flickr.Encoding PSK31 with an 8-bit AVR doing analog waveform generation through a resistor ladder network.  The phase-shift occurs after cosine-ramping down to DC, then back up on the new phase to reduce bandwidth.  The FFT shows the primary spike at 500 Hz, the audio carrier frequency; I’m not sure why there is a second spike at 750 Hz.  Source code.

AVR PSK31 on Flickr.

Encoding PSK31 with an 8-bit AVR doing analog waveform generation through a resistor ladder network. The phase-shift occurs after cosine-ramping down to DC, then back up on the new phase to reduce bandwidth. The FFT shows the primary spike at 500 Hz, the audio carrier frequency; I’m not sure why there is a second spike at 750 Hz. Source code.