On Fri, Oct 31, 2003 at 02:29:54PM +0000, matthew jones wrote:
I really don't understand why people are so hooked up on using MIDI or serial/parallel ports for interfacing sensors with pd. It strikes me that the absolute best way if you are at all worried about sample rate/quantisation amount is to use the audio signal inputs of your soundcard. some simple circuitry and then you have maybe a 96kHz 24bit input - super fast control and with same latency!
am I mistaken? has anyone used this to good effect? I was thinking
that
the terminatorX style turntable things are a prime example of where a mouse just doesn't offer enough resolution to do even a half decent job....
There's many ways to interface sensors. Using an audio card is definitely possible, but it's not a silver bullet. Many audio cards cannot be used an input interfaces, often because the input stages are expecting audio signals and nothing else.
Here's a good example of using an audio input as an interface input: http://www.inf.ethz.ch/~mringwal/lirc/ This PDF explains that some audio cards are using a DSP to filter the input signals: http://www.minidisc.org/contrib/oded_files/AudioCardIRSampler.pdf
I'll try this audio input lirc interface, and see if the idea could be extended to other interface circuits. -- Marc