// -----------------------------------------------------------------
// invert_delay_sound.ck -- realtime scanner noise cancellation
//   for fMRI paradigms.
// Written by: Patryk Laurent, University of Pittsburgh, 2009.
// -----------------------------------------------------------------
2000.042::ms => dur delayLength;    // Based on duration of TR, fine tuned for computer.
// Set up input-output copy through a virtual y-plug, and a path for a delayed input.
adc.left => Gain half1 => Gain yPlug => dac;
adc.left => Gain half2 => Gain phaseInverter => DelayL delay => yPlug;
0.5      => half1.gain;
0.5      => half2.gain;
1.0      => yPlug.gain;
// Set up inverted, delayed copy.
-1          => phaseInverter.gain;
delayLength => delay.max => delay.delay;
while(true)
{
    100::ms => now;
}