» 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

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Shoutbox

~4d ago

nanotekt: VL.stride yet again ...this time nonphotorealistic https://youtu.be/_aALr2wcj0Y ...wish evvvveryone to be well!

~9d ago

nanotekt: a brief VL.stride study https://youtu.be/B2Nlz5VZ9lM ...and a massive 'thank you' to the devvvvs!

~3d ago

everyoneishappy: @overtones this would require 4D noise, which is possible but not implemented in Fieldtrip

~11d ago

overtones: Hi! SF2D has Time & DomainOffset inputs, but SF3D only DomainOffset. Is there a way to use Time in SF3D or it makes no sense? Thx

~14d ago

joreg: @SabrinaVerhage this could be useful for you next "hacking sex" workshop: https://buttplug.io they have a .NET nuget for use in vvvv!

~22d ago

ravazquez: Happy new year!

~22d ago

sunep: Happy new year everyone!

~26d ago

ggml: confirmed. thanks

~26d ago

david: @ggml fixed. please try again.

~26d ago

joreg: @ggml confirmed. we'll investigate..