At the beginning of this video clip, robot "H.E.R.B.I.E's" voice ...I know it's a very generic sound now a days, but yet so hard to recreate...To me it sounds like one of the IR responses from Altiverbs speakerphone, but I couldn't nail it down...and if you insist it's a high passed short delay with high feedback, it is not...I would appreciate if you take the challenge and recreate it and post it with your answer...please only make suggestions that can be backed up with a recreated sample...just want this one to be more to the point and simply helpful to me as much as to others...thank you all in advance... ps: here is one more clip
You might want to try an eq with several tighly notched bands, but boosted. Try giving them a harmonic relation. You could try using a dehum plugin in the opposite way. Maybe some chorus or delays for that mechanic futuristic speaker touch. If it doesn't ring long enough, some reverb on the processed signal?
I have to say that I strongle agree with @Arnoud's comment about trying it yourself. Having said that I'm not sure you're currently heading in the right direction. I think this is a modulated filter (cut-off) effect with high resonance value, feedback and modulating frequency.
Cubase (so I assume Nuendo) cames with a plug-in in the Modulation effects call "Metalizer" that implments a modulated filter effect that can be used to give this effect. Obviously you will need to play parameters to get exactly what you are after.