a188/1 example for filtered clock noise
2006-01-06 by selfoscillate
hello all, the following example shows the sonic differences of filtered and unfiltered clock noise in a bbd module. this example is taken from the a188/1 prototype with 2048 stages ic. a small repeating sequence is running through the a188/1. you hear the pure bbd output without the original signal (this way the effect can be recognised best). first comes the unfiltered a188/1. the clock is swept from high speed to very low speed and then again back to high speed. after that you hear the same sequence/sweep, but now the a188/1 output is filtered by an a108 lowpass (48 db output). the a108 is swept with the same voltage as the a188/1. i have carefully adjusted the filter to make sure that it closes only as much as necessary to suppress the clock noise. in the first part the clock noise can be heard loud and clearly as the clock slows down. the signal falls apart and is full of aliasing, sounding somewhat like a bit reduction effect. this is for the experimentalists :-) in the second part the clock noise is filtered out and therefore the typical "dulling effect" of a common analog delay occours. this is for those who want that lush warm retro-sound :-) http://www.selfoscillate.de/a100files/a188-1-filtered-clock.mp3 file size: 833 kb best wishes ingo