» 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

~10h ago

xd_nitro: no users in all of Wales!

~18h ago

microdee: it's like telling a west-Ukrainian that they're Russians...

~18h ago

microdee: @tonfilm: Telling a person from Hong Kong that they're Chinese is a bigger insult than calling their mom names ;)

~18h ago

tonfilm: Patch your own #mainloop with microsecond precision in #reactive #dotNET style. #rxNET #rx #gamedev #vvvv #VL vl-patch-your-own-mainloops

~19h ago

neuston: Sad. It hurts.

~19h ago

joreg: well, they would even have to choose "united" kingdom..

~19h ago

neuston: M... not work emotionally. Like asking a Scotland citizen to pick England

~20h ago

joreg: @neuston would it work for you to select "China"?

~20h ago

neuston: No Hong Kong in the country list of license page