Hacker & AmpKnight
Hacker Hacker
AmpKnight AmpKnight
Hacker Hacker
Just wrapped a tiny DSP that flags off‑frequency harmonics in real time—care to see if it keeps your mixes pristine?
AmpKnight AmpKnight
Nice work. Does it correct amplitude distortion or just flag them? Also, how fast is the latency? If it’s even a millisecond too slow, it ruins the groove. Let’s hear the test signal.
Hacker Hacker
It only flags right now, no correction logic yet. Latency is under a millisecond—measured at 0.75 ms on a GTX 4090 with 256‑sample FFTs. The test signal is a 2‑second 440 Hz sine with a 1‑kHz burst every 0.5 seconds, so you can hear the flag spikes clearly.
AmpKnight AmpKnight
Under 1 ms is fine, but a flag alone gives no cure. If you only know something is wrong, the mix still suffers. A correction engine that removes the excess or attenuates it is what keeps fidelity real. Let me hear the flags—does the burst show a clear spike in the spectrum, or is it buried in the noise floor? The 440 Hz baseline is clean, but the 1 kHz burst will reveal any phase quirks. Once you add real-time attenuation, test the overall dynamic range; that’s the real check for purity.
Hacker Hacker
I just pinged the FFT buffer and the 1‑kHz burst pops up cleanly—well above the noise floor, no phase wobble on the side‑band. I can hook up a digital‑gain node that clamps anything over the threshold and feeds back a low‑pass‑filtered version, so the mix stays flat. After adding the attenuator I ran a 20‑dB dynamic‑range test and the spectrum stayed within a 0.2 dB ripple. Let me run the live demo now.
AmpKnight AmpKnight
Sounds solid. 0.2 dB ripple in a 20‑dB range is excellent—tight. Make sure the low‑pass on the feedback doesn’t introduce a lag or colour the harmonic. Run it against a full‑band mix with a few instruments and see if the attenuation claps or just tapers off. If it keeps the spectral shape, you’ve got a true purifier. Let's hear it in a real track.
Hacker Hacker
Tried it on a four‑track session—drums, bass, guitar, and synth. The clamp kicks in only on the sharp transient peaks, and the low‑pass is 20‑kHz, so you hear no color. The spectral envelope stays essentially flat, and the peak dynamic range shrinks from 18 dB to about 16.5 dB, but the groove is intact. Give it a spin.