A card with image quality similar to matrox!

[Gurm]

Indiana - it's called SARCASM. The fact that dZeus isn't a native Eenglish Spekker is no reason to overlook the obvious humor.

- Gurm

[Indiana]

Well, before he edited the post it was not THAT clear (at least not to me as another non-native english speaker) that he meant this in a sarcastic way.

[Gurm]

Yeah, I know.

- Gurm

[Indiana]

Besides, I had a major calculation error in there.
1600x1200@120Hz is in fact ~336MHz RamDAC speed, with 230MHz you "only" get 85 Hz.

But I'd like to see the monitor that can do 1600x1200@120Hz since it would require a 150KHz horizontal frequency. My not really underspecced 22" Iiyama VisionMaster Pro510 can only do ~100Hz (130KHz) at this res.

[Greebe]

ralf, passive filtering like that used to remove the stereo pilot signal from FM broadcast went active simply because design constraints. There is a huge difference between a 19kHz signal and one which is broadband which you are comparing. A 19kHz passive notch filter used to reduce that frequency effectively so that it doesn't demagnatize the tape will also cause horrible phase shifting, impaired transient responce and ringing in the surrounding region not to mention removing much of the treble frequencies.

Active filters can be made to compensate for such issues in a much cheaper design without needing alot of passive components of critical values which greatly increases the costs to implement. One example of this is the frequency band which a notch filter effects. All filters have x amount of poles. This is measured over an octave region of the band...

example:
1 pole = 6dB/octave
2 poles = 12dB/octave
3 poles = 18dB/octave
4 poles = 24dB/octave
5 poles = 30dB/octave

etc etc...

Now take into consideration that the normal FM stereo broacast limits the upper end to 16KHz and a notch filters center is at 19kHz and you begin to have major design issues as the filters will audibly effect the high end region. With a high order filter the half band centered at 19kHz is 9.5kHz so even if using a high order filter you would be killing off most of the treble in the broadcast if you attempted to remove the pilot signal using passive filter designs. It's just ultra difficult to do passively/inexpensively.

[DentyCracker]

I think what Greebe is saying is that it can easily be done passively at the higher frequencies, without resorting to an active filter.