» Audio Analysis
This site relies heavily on Javascript. You should enable it if you want the full experience. Learn more.

Audio Analysis



Related nodes

RMS (DShow9)
RMS (Bass)
Gist (VAudio)

The Gist (VAudio) tracks several features of the incoming audio:

  • RMS
  • PeakEnergy
  • ZeroCrossingRate
  • SpectralCentroid
  • SpectralCrest
  • SpectralFlatness
  • EnergyDifference
  • SpectralDifference
  • SpectralDifferenceHWR
  • HighFrequencyContent
  • PitchYin

There are RMS (DShow9) and RMS (Bass) simple envelope followers. They return the current volume for the left and the right channel.


With all DShow9 pins (of type audio / midi / video) you can connect each output to only one input pin. Therefore it is not possible with the DShow9 system to play a file and analyse it at the same time. The BASS and VAudio doesn't have this restriction.

Examples in your vvvv\girlpower\ directory:

  • Audio


Related nodes

FFT (DShow9)
FFT (VAudio Sink)
FFT (Bass NRT)
FFT (DShow9 4Channels)

There are several nodes performing a Fast Fourier transform:

An FFT returns a spread of amplitudes of a linearly distributed scale of frequencies. But based on experiments on human hearing perception it is known that the scale of frequencies is approximately logarithmic at the high-frequency end, and nearly linear at the low-frequency end.

That means that human meatbags can very good distinguish between low frequencies but the high frequencies sounds almost all the same. Music producers of course make use of that fact, see Psychoacoustics.

That’s not all. Amplitudes should be scaled in a way, that higher frequencies have a bigger scaling factor. Despite the fact that low frequencies carry high energies (resulting in big values coming from FFT), humans perceive low frequencies dull. That is why mid and high frequencies have to be scaled up (nonlinearly).

The FFT Nodes have the Frequency Scaling exactly for that.

For more info on perception check: Equal-loudness contour.

Examples in your vvvv\girlpower\ directory:

  • Audio

Beat trackers

Related nodes

BeatDetector (Value)
BeatDetector (BASS)
BeatScanner (Bass)

There are some useful modules to track beats:

Examples in your vvvv\girlpower\ directory:

  • Audio

anonymous user login


~10h ago

metrowave: @marlonossiliere, Win10 is fine, also see: best practices when using bootcamp

~19h ago

marlonossiliere: I have a Macbook pro mid 11, 13 inches, what windows is the best for bootcamp installation?

~2d ago

joreg: your 2017 numbers have landed: vvvv-in-numbers-2017 #vvvv #vl

~2d ago

joreg: final part of "vl for vvvv users" series of video tutorials is now up: https://discourse.vvvv.org/t/vl-for-vvvv-users-spread-of-spread-5-5/16028 #vvvv #vl

~4d ago

joreg: another one for the weekend: part 4/5 of: vvvv for vl users. all about loops: https://discourse.vvvv.org/t/vl-for-vvvv-users-spreads-vs-spreading-pt-2-4-5/16027 #vvvv #vl

~4d ago

joreg: one for the weekend: rc3 for beta36 is out: beta36-release-candidate #vvvv #vl

~5d ago

fibo: Wine v3 has Direct11 support https://www.winehq.org/news/2018011801