cool looking wave effect in soundwave visualisation.

Discussion in 'Production' started by duttymonster, Jan 19, 2011.

  1. duttymonster

    duttymonster deep in the jungle

    Joined:
    Oct 8, 2010
    Messages:
    380
    Likes Received:
    0
    Location:
    Cooden Beats
    any one know what it is that causes this?

    i see it quite a lot in house music like this (on the intro)



    is it compression?
     
  2. djdevz

    djdevz Member

    Joined:
    Sep 17, 2010
    Messages:
    582
    Likes Received:
    2
    Location:
    London
    its called a cloud...its soundcloud's logo.

    nah jus messing mate the track aint working!

    ---------- Post added at 19:45 ---------- Previous post was at 19:43 ----------

    i retract my comment; it works now
     
  3. kuthoerrr89

    kuthoerrr89 Member

    Joined:
    Jan 16, 2010
    Messages:
    238
    Likes Received:
    0
    Location:
    Rotterdam
    Ghost channels? :p
     
  4. RUSSLA

    RUSSLA DNBF Monarch

    Joined:
    May 23, 2008
    Messages:
    6,259
    Likes Received:
    885
    Location:
    BH1
    Yeh i thought this the other week, there isnt any audible elements there that could make those waves, someone answer this as its well buggin me!

    My only guess is really quiet white noise?!
     
  5. groelle

    groelle Well-Known Member

    Joined:
    Feb 6, 2007
    Messages:
    5,497
    Likes Received:
    92
    Location:
    northern germany
    id say its sidechaining without listening to the track. dunno really tho.
     
  6. duttymonster

    duttymonster deep in the jungle

    Joined:
    Oct 8, 2010
    Messages:
    380
    Likes Received:
    0
    Location:
    Cooden Beats
    i've asked a couple of house cats. they should know. i'll let you know once i've found out.

    ---------- Post added at 18:07 ---------- Previous post was at 17:14 ----------

    I spoke to my mate Rob Clarke, and sent him one of his own tunes with the effect on, he said it's level automation, but i don't really see how
    it can be.

    i'm still confused, personally i think the most obvious thing would be the attack and release of the master compression at this tempo, but
    hopefully a Jedi will appear on here shorty and explain it to me :D
     
    Last edited: Jan 20, 2011
  7. Innovine

    Innovine Active Member

    Joined:
    Dec 28, 2008
    Messages:
    436
    Likes Received:
    27
    Location:
    sweden
    It is an aliasing artifact, made by the software used to render the wav file on screen. It's not part of the audio, per se. It's a combination of the shape of the kick, and the bpm of the song (and also the zoom level of the soundcloud player)


    As an experiment, I made a track of just a kick drum, at slowly increasing speed... like it? :)



    It actually looks different, and more distinct, if you visit my tracks page: http://soundcloud.com/magpieindustries/tracks
    I think the difference here is that the width of the wav display has changed.
     
    Last edited: Jan 20, 2011
  8. Forau

    Forau CONCUSSION RECS

    Joined:
    Dec 2, 2010
    Messages:
    4,799
    Likes Received:
    262
    Location:
    Room 2 @ Fabric
    Looks badass.
     
  9. duttymonster

    duttymonster deep in the jungle

    Joined:
    Oct 8, 2010
    Messages:
    380
    Likes Received:
    0
    Location:
    Cooden Beats
    thanks again Innovine, i looked into it and you are spot on. it would seem as if it is a common phenomenon during digital to analogue conversion and is common when the audio contains frequencies over 16,000hz.
     
  10. Innovine

    Innovine Active Member

    Joined:
    Dec 28, 2008
    Messages:
    436
    Likes Received:
    27
    Location:
    sweden
    Not in this case... It wont matter what the frequency is, you could have only a 20hz wave in there and it'd produce weird patterns

    what's happening is this (ill try explain it..)

    The image you are looking at is made up of pixel columns. These are equally spaced out over the duration of the file, for instance, if the track is 5mins long (300 seconds), and the image is 600 pixels wide, it will examine the wav file every half second, and take the value there for the colouring of the pixel. So, it doesnt matter what in in the audio file, just what the value of the wav is at exactly 0, 0.5sec, 1sec, 1.5sec, 2sec and so on. If you put a kick at exactly each of these time points, you'll read out the very same value each time, resulting in a perfectly smooth image.

    Of course, in the real world, the renderer is probably not working exactly like this, it may be looking at neighbouring points, or have floating point rounding errors, soundcloud run their own compression/transcoding and normalization and stuff, but the theory is roughly the same.

    now, if you were to place a kick at 0sec, and the following one at 0.49999secs, what happens is that for the first, the renderer reads the wav and gets the very initial bit of the kick. When it looks at 0.5secs into the file, it reads a tiny bit later in the (next) kick. If the kicks are spaced out at 0.499999 seconds, each time the renderer draws a new column, it will read a tiny bit later in the kick sample each time. So in theory, you could see the actual kick wavform stretched out in the renderer if you got the timing exactly right. But as mentioned, in practice its probably not controllable.


    Similar problems occur with audio sampling and resampling, if you have high enough frequencies they end up wrapping around and becoming lower again. This is traditional audio aliasing and it sounds nasty, but the visual aliasing is more intuitive I think.
     
  11. duttymonster

    duttymonster deep in the jungle

    Joined:
    Oct 8, 2010
    Messages:
    380
    Likes Received:
    0
    Location:
    Cooden Beats
    that's what i'm talking about!

    i knew you were a jedi.
     
  12. Innovine

    Innovine Active Member

    Joined:
    Dec 28, 2008
    Messages:
    436
    Likes Received:
    27
    Location:
    sweden
    Thanks :)

    It's also why car wheels look like they spin backwards in movies sometimes.
     
  13. duttymonster

    duttymonster deep in the jungle

    Joined:
    Oct 8, 2010
    Messages:
    380
    Likes Received:
    0
    Location:
    Cooden Beats
    "It is good sometimes to stop and reflect on the beauty of nature and the Force." ;D
     
  14. TongueFlap

    TongueFlap Flappin'

    Joined:
    Jun 1, 2009
    Messages:
    3,839
    Likes Received:
    8
    wicked tune man! nice wave as well.

    ---------- Post added at 18:42 ---------- Previous post was at 18:41 ----------

    oh is it not ur tune :(