Jump to content


Photo

Pop in wav file, not visible in waveform


  • Please log in to reply
10 replies to this topic

#1 Legion303

Legion303

    Ryu Hayabusa (+2300)

  • Members
  • PipPip
  • 2,327 posts
  • LocationDenver

Posted 02 April 2012 - 12:36 PM

This is very strange. I recorded a bass through my soundcard and it came out fine, except at various places in the recording there are pops like the ones you hear when your CPU is lagging. But when I open the file in a wave editor, I can zoom to the sample level and find no spikes or discontinuity at all. This is a very pure waveform, so any problems should be easy to spot.

I cut out one of the suspect areas and saved it to a new file, and the pop is still there, and still no evidence that there should be one. Does anyone know what could be happening?

#2 Metal Man

Metal Man

    Fox McCloud (+1200)

  • Members
  • PipPip
  • 1,204 posts
  • LocationSaguenay (QC)

Posted 02 April 2012 - 03:02 PM

Turn off software monitoring; turn on direct monitoring if you soundcard allows it.
Or raise your buffer a little ?

#3 Legion303

Legion303

    Ryu Hayabusa (+2300)

  • Members
  • PipPip
  • 2,327 posts
  • LocationDenver

Posted 02 April 2012 - 09:53 PM

But none of that is the issue.

#4 PROTO·DOME

PROTO·DOME

    Kirby (+1500)

  • Members
  • PipPip
  • 1,662 posts
  • LocationEngland

Posted 02 April 2012 - 09:56 PM

This is absolutely no help at all, but I used to have this way back with high quality MP3s on my old PC.

Posted Image


#5 Moseph

Moseph

    Strider Hiryu (+2100)

  • Members
  • PipPip
  • 2,178 posts
  • LocationSaint Louis, MO

Posted 03 April 2012 - 03:12 AM

I don't know that this helps at all, but I have on occasion zoomed in to sample level to try and fix pops that I could see in the waveform, and the pops remain even after the waveform has been smoothed. So it goes both ways, at least.
Posted Image

#6 Ivan Hakštok

Ivan Hakštok

    Futebol Arte Director

  • Members
  • Pip
  • 640 posts
  • LocationSton, Croatia

Posted 03 April 2012 - 05:48 AM

I had a similar issue - for some reasons audio drivers were conflicting with my bluetooth and wireless drivers. Try disabling those if you have them.

#7 Legion303

Legion303

    Ryu Hayabusa (+2300)

  • Members
  • PipPip
  • 2,327 posts
  • LocationDenver

Posted 03 April 2012 - 02:34 PM

I need to explain this a little better than I did. The problem isn't sound card latency or any of that--I re-recorded the part and it was fine. The problem is that I'm looking at a smooth wave form that has inexplicable noise in it which can't be seen. I snipped out part of the file and listened to it on another computer, ruling out hardware issues.

I think Moseph hit it on the head. For whatever reason, some sound artifacts can't be seen even at the sample level. I'm just curious as to why this is.

#8 Nutritious

Nutritious

    Judge, Portrait of a Plumber Director

  • Members
  • PipPip
  • 1,932 posts
  • LocationNorcal

Posted 03 April 2012 - 10:07 PM

An example sound clip may help :)
Posted Image
Current Projects: SD3
Released Projects: BC Boss Wild Arms FF4 Super Metroid Tales Xenogears DKC2 FF5 Mario 64

#9 Legion303

Legion303

    Ryu Hayabusa (+2300)

  • Members
  • PipPip
  • 2,327 posts
  • LocationDenver

Posted 05 April 2012 - 08:14 AM

http://neutronstar.o...audiosample.wav

#10 Ivan Hakštok

Ivan Hakštok

    Futebol Arte Director

  • Members
  • Pip
  • 640 posts
  • LocationSton, Croatia

Posted 05 April 2012 - 08:43 AM

Don't know how you didn't see it, but there's certain stutter in the wave file, visible on the screenshot here:

http://i41.tinypic.com/13zzbbk.png

Clicks don't necessarily have to be huge bumps - in this case the wave with the jump goes through Fourier transform, and jumps like this one generate higher frequencies, aka the click.

Here's the spectrum of the same section:

http://i44.tinypic.com/u1slx.png

#11 Legion303

Legion303

    Ryu Hayabusa (+2300)

  • Members
  • PipPip
  • 2,327 posts
  • LocationDenver

Posted 08 April 2012 - 12:55 AM

Don't know how you didn't see it


Because of my derpitude. I was zoomed in to sample level, where that spike looks like a gentle slope, and to compound it I was looking for large discontinuities. But you're right, that's where the issue is. Thanks for solving the mystery for me.




0 user(s) are reading this topic

0 members, 0 guests, 0 anonymous users


games | mixes | artists | albums