réactions à la news L’OB-X8 est mis à jour

Je ne comprends pas trop l’histoire du nouveau filtre.
Comment peuvent ils ajouter un nouveau filtre sur un synthé analogique par mise a jour?

Citation de Gam :
Je ne comprends pas trop l’histoire du nouveau filtre.
Comment peuvent ils ajouter un nouveau filtre sur un synthé analogique par mise a jour?


Sauf erreur, les filtres de l’OB-X sont basés sur les IC de SSI qui sont des 4-poles utilisés comme des 2-poles (2-poles ne sont pas utilisés), comme sur les OB-X originaux qui eux utilisaient des CEM3320. Je pense qu'ils avaient prévu le coup et, comme tout est contrôlé numériquement, soit ils bypassent 2 poles sur chaque IC et ça donne des filtres 12dB, soit ils utilisent les 4 poles et ça permet d’avoir le filtre 24dB dont ils parlent. S'ils ont prévu le coup à partir de 4 poles, ils peuvent aussi techniquement faire du pole mixing et avoir quasiment tous les types de filtres (HP/LP/BP/Notch).

Je ne comprends pas trop l’histoire du nouveau filtre.
Comment peuvent ils ajouter un nouveau filtre sur un synthé analogique par mise a jour?

Je ne comprends pas trop l’histoire du nouveau filtre.
Comment peuvent ils ajouter un nouveau filtre sur un synthé analogique par mise a jour?

Amazingly, the new filter type is still analog. In fact, the entire OB-X8 signal path is always completely analog. The engineers worked some magic to make this filter happen.

To add some more detail regarding the new filter type: The entire audio signal path in the OB-X8 continues to always stay 100% analog. What has changed is the way that the analog circuitry is configured and controlled under the control of the firmware. The new filter mode doesn't replace any of the existing six filter modes, it is a new seventh mode. Of the six existing modes, only one is a 4-pole, and it is exactly the same configuration as in the OB-Xa and OB-8 (utilizing the same authentic Curtis CEM3320 filter chip that was in the originals). It was very important to us to replicate exactly the analog circuitry and performance from the originals, so the OB-X8's existing 4-pole mode works exactly as it does in the originals, which means that the resonance amount is limited, and the amplitude of the output decreases as resonance increases. Although I do love the sound of the original 4-pole filter, especially at lower resonance levels, I honestly have long lamented (since the '80s!) that it loses "girth" as you increase the resonance. While we were brainstorming new features that we could add to the OB-X8 firmware it occurred to us that we could utilize the programmable circuitry around the filter, namely the input, output, and resonance VCAs, to provide gain and feedback compensation dynamically depending on resonance level. And while we were at it, we let the resonance VCA increase further than before, so that more extreme 4-pole resonance sounds can be achieved. The result, IMO, sounds really great, and brings to the OB-X8 a new filter mode that never existed in any of the classic Oberheim's (and without having to give up any of the old ones). Hope you all enjoy it as much as I do!