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
Well at least there is a very short delay on it with a high feedback into the original signal. This makes the voice get so "metallic box" sounding. It's dead simple actually. Experiment from that point onwards, have fun!
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?
What DAW are you using? If you're using Pro Tools, take a look at the AIR Reverb plugin (which comes bundled) as it has preset called "inside tank" (or something similar) which you can adjust to your liking.
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.
As @Arnoud mentioned, it sounds like a short delay with a high feedback setting (which is where the tonal aspect comes from). The first thing that comes to mind would be to play with a Flanger plugin and try short delays with a high(ish) feedback setting.
spectral feedback delay/chorus will do just the kind of post-effect you are looking for.