TranceAddict Forums (www.tranceaddict.com/forums)
- Production Studio
-- ...That "professional" sound
Pages (3): « 1 2 [3]

Mmm, that's a great thread...

What's about "Nyquist Mirroring"? A theory that's true? If yes, how to use?

Please, take a look here:
http://www.metamacro.com/awezoom/skale/tutorials.htm


Cheers,
Uri

quote:

Originally posted by BetaFactory I have only learnt the basics of EQ by experimenting by my own, and I have a question for you: Lets take the kick drum and the bass drum. I guess these can occupy the same frequencies as long as they do not "cover" each other? But what with moving basslines that cover the whole pattern, and thus also covering all the kick drum notes? I've never really thought of EQ:ing when it comes to kicks vs. bass, I've only EQ:ed away sub frequencies from leads, pads, effects etc.

One thing you could try is sweeping the EQ on your bassdrum to get the key points - the top punch and the bottom thud (not the rumble) and then cut those points on the bass channel, not necessarily too much though. That way your bassdrum cuts through. I find that by using three layers of bass and doing that it somehow seems to sit ok.

quote:

Originally posted by UriPui Mmm, that's a great thread... What's about "Nyquist Mirroring"? A theory that's true? If yes, how to use? Please, take a look here: http://www.metamacro.com/awezoom/skale/tutorials.htm Cheers, Uri

There's nothing really more to it than said in the article. The sampled signal in your computer it pure theory, containing frequnecies "mirrored" at every multiple of the samplerate, even negative ones. Like if you sampled a signal containing two sinewaves the original spectrum would look like this:

...I..I....,...........;

(with ";" depicting the samplerate and "," as its half)

the postive spectrum of the sampled signal would look like this:

...I..I....,....I..I...;...I..I....,....I..I...;...I..I....,.. (and so on)

Now if push frequencies beyond half the samplerate they start reappearing from higher frequencies going down.

Let's push one tone up: (i'll mark the mirrored ones as "i")
...I...I...,...i...i...;...I...I...,...i...i...;...I...I...,..
...I....I..,..i....i...;...I....I..,..i....i...;...I....I..,..
...I.....I.,.i.....i...;...I.....I.,.i.....i...;...I.....I.,.i
...I......I,i......i...;...I......I,i......i...;...I......I,i.
...I.......I.......i...;...I.......I.......i...;...I.......I..
...I......i,I......i...;...I......i,I......i...;...I......i,I.
...I.....i.,.I.....i...;...I.....i.,.I.....i...;...I.....i.,.I

See how the mirrored frequency slowly moves down while the original is pushed opwards? Now as it is assumed that the singnal contained only frequencies up to samplerate/2 everything above is cut off to restore the analog signal. But as we pitched the original up, some of the theoretical mirrored parts slip though and become reality.

As for examples... take a bad softsampler an play a bass sample with lots of harmonics as high as you can. Chances are that you can hear bassnotes counteracting your play.
As the pitch of the aliases also depends samplerate, its very hard to impossible to use the effect in a musical way. But be aware of it, as it can add unwanted material to your mix.

Dom, where are you? =)

Hey Dom, where's your much needed input!

C'mon, take some time away from your busy schedule hanging out with PvD and post your reply, damn it! LOL

Powered by: vBulletin
Copyright © 2000-2021, Jelsoft Enterprises Ltd.