» Audio Analysis
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Audio Analysis

Italian

RMS

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.

Note

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

FFT

Related nodes

FFT (DShow9)
FFT (VAudio Sink)
FFT (BASS)
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

Shoutbox

~1d ago

joreg: @utah sorry i meant this video, which explains how to find the Renderer node in newer vvvversions: https://youtu.be/xkrbT45BgOQ

~2d ago

~4d ago

utah: not able to find the "Renderer "

~7d ago

NoseBleedIndustries: Please, integration with this low cost mechanical display, so beautiful! https://www.vestaboard.com/

~7d ago

NoseBleedIndustries: Please, integration with this low cost mechanical display, so beautiful! https://www.vestaboard.com/

~11d ago

joreg: @mediadog they are here: workshop-videotracking-node10

~11d ago

mediadog: Hmmm slides for node10 video tracking cannot be found: workshop-videotracking-slides

~13d ago

joreg: @mediadog thanks for the pointer, links are updated

~13d ago

mediadog: Where are the 50beta42 offline instalers? The offline installers are still linked to 41, not 42.