[chuck-users] delay times of STK delays seem to be 1 sample off?
vboehm at gmx.ch
Fri Feb 29 13:07:00 EST 2008
i was running some simple tests to hear the difference between
allpass vs linear interpolating delay lines when i noticed that there
is obviously a little bug in how the delay time is calculated in the
delay UGens from STK.
the following example feeds an impulse into a DelayA with high
feedback and compares the tuning to a TriOsc.
can't i trust my ears or is the tuning only correct if i add 1 to
deltime before calculating the frequency for TriOsc?
Impulse imp => Gain out => dac;
out => DelayA delay => out;
TriOsc tri => dac; // test oscillator
44100.0 => float sr; // sampling rate
// delay time in samples
150.5 => float deltime;
deltime::samp => delay.delay;
// calc tri freq from delay time
// have to add 1 to deltime to get correct tuning
sr / (deltime) => tri.freq;
// set feedback level
0.999 => delay.gain;
0.3 => tri.gain;
1 => imp.next;
6::second => now;
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