Blog entry

Recording and playing hundreds of channels of audio

Posted by Adrian Freed on March 18, 2008

Rimas has been working on multichannel recording software for microphone array applications. It was curious deja vu for me since I had to do numerous tricks back in the MacPlus days to get stereo 16-bit 44.1kHz to work including inventing a format for stereo audio files. Digidesign copied this from MacMIX and it became the sound designer II format.

Blog entry

Bobbin: Conductive-Thread Touch Controller

Posted by Adrian Freed on March 12, 2008

This bobbin is laced with conductive thread. The thread is pushed against the conductive tape on the interior. Up to two string depressions can be sensed independently. Thanks to Natalie Freed for constructing this prototype.
[inline-left:1=Bobbin: Conductive-Thread Touch Controller]

Blog entry

Many touch Controller: Constrained Multitouch

Posted by Adrian Freed on March 12, 2008

This Controller conceived by David Wessel and built by Rimas Avienis uses an array of Internlink touch pads that sense position (XY) and pressure (Z). I developed a circuit to concurrently translate the 4 wire resistive network of the pad into output voltages that can be rapidly measured to compute XY and Z.
[inline-center:1=Many touch Controller: Constrained Multitouch]

Blog entry

Electronic Kalimba

Posted by Adrian Freed on March 12, 2008

This simple controller is inspired by the south African kalimba. The kalimba lends itself to rapid assembly because of its use of a single central bar held down by two screws to trap the array of tines between two pivot points.

[inline-center:IMG_6362.jpg=Kalimba with bend sensors and PIC microcontroller]

Blog entry

dafx 2008 call

Posted by Adrian Freed on March 4, 2008

===========================================================
11th International Conference on Digital Audio Effects
DAFx-08
September 1-4, 2008
Espoo, Finland
http://www.acoustics.hut.fi/dafx08/
===========================================================

NEW: The web upload system for paper submissions is now open!

Blog entry

Efficient System profiling using lock-free /dev/osc

Posted by Adrian Freed on March 4, 2008

OSC is a useful format for profiling and tracing because of timestamps and the efficiency of binary representation of the data. A low-overhead way of logging the trace information is to send it into a lock-free buffer that is dma'd out into the ethernet for logging on a second machine.

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