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DC offset in Pulverisateur noise generator

Jordi Moragues · started 2020-07-12 19:12 · updated 2020-07-12 20:00

The noise generator from the Pulverisateur seems to exhibit noticeable DC offset in its pink and brown colours (range from 25% to 0%). The other colours seem unaffected. The image below shows a noise colour linear sweep from Purple (100%) on left to Brown (0%) at right. The DC offset kicks in gradually as the colour passes white and goes into pink. The DC offset is actually visible in the top audio level meter once the colour approaches brown: the amplitude of the sound drops substantially, but the level on the meter has big fluctuations.

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Comments (2)

2020-07-12 19:24 · 2020-07-12

try putting brown noise onto a waveshaper to distort it and you can notice the fluctuations. i kinda like it that way though, since i can get pretty cool sounds by distorting synths with brown noise

2020-07-12 20:00 · 2020-07-12

That's cool, but DC offset is generally undesirable. It eats up headroom without giving any loudness in return. The waveshaper just exacerbates the problem: even silence gets a loud metering because the signal is way out of axis. If I wanted fluctuations, I'd rather use an LFO in sample and hold or random mode.