» Audio Analysis
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Audio Analysis

Italian

RMS

Related nodes

RMS (DShow9)
RMS (Bass)

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 directshow 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 system doesn't have this restriction.

Examples in your vvvv\girlpower\ directory:

  • Audio

FFT

Related nodes

FFT (DShow9)
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

joreg: @mediadog: indeed, fixed that!

~11h ago

mediadog: @microdee @joreg Aha! I had glanced at that list, but assignment was lurking beyond the scrollbar. Athankew!

~13h ago

joreg: first-come-first-serve tickets are now sold out except the "delegate" ones. others are still available from here: https://nodeforum.org/journal/node17-tickets/

~13h ago

~15h ago

microdee: @mediadog: default is set via assignment (equal sign)

~24h ago

mediadog: No default for effect parameters, just min and max?

~1d ago

microdee: regular *fcfs tickets for #node17 are already sold out, and non lowered regular ticket isn't available straight from main page

~2d ago

mediadog: @evvvvil Man if that was 10th I want to see 1-9. 4kb, insane!

~2d ago

evvvvil: @sinus, thankx a lot broh! LJ, guy from my group desire, won shader showdown :) couldn't enter as qualifiers were on Friday. Peace

~3d ago

sinus: @evvvvil: great!! nvscene shader live coding 666: https://www.youtube.com/watch?v=O-1zEo7DD8w