Oscilloscope Quick Doc
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Direct-X VST plug-ins

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- Stereo Oscilloscope.




The very first steps

STEP -1- : Display the Meter Window.



STEP -2- : Set the Framerate to 20 or 30 frames per second.


STEP -3- : Select a better upsampling value to get a smoother beam.


STEP -4- : Adjust the beam density and persistence.


STEP -5- : Tweak the Auto Scale knob to your liking.



Concept


VB Audio's Stereo Oscilloscope is a device that you will use to display a two-dimensional representation of a stereophonic signal called Lissajous Curve. This allows you to evaluate different aspects of an audio signal, particularly when working on a mastering session. VB Audio's Stereo Oscilloscope emulates the behaviour of a two-channel electronic oscilloscope in the best possible way (when set to Lissajous mode : left channel on the vertical axis and right channel on the horizontal one).


Basics :


Click the Display button to open the VIEW window and visualize the curve. The Mute button will freeze the measuring process.


Synchronization :


This delay setting, up to 2 seconds long (set to 0 ms per default) will allow you to synchronize the display with what you're hearing, if required (the aim is to delay the display so that it is synchronized with the sound).


Re-Sampling


The graphical user interface gives you the possibility to upsample or downsample the signal so that you can have control over the quality of the light beam, particularly its continuous or discontinuous aspect (cloud of dots). At 44.1 or 48 kHz, one will rather use an oversampling setting of 8 or 16 times, which will give the same kind of light beam as those displayed on real cathode ray tubes. Then, depending on CPU load, display rate and other parameters, perhaps you'll want to decrease this samplerate.



Automatic Scale Length


The "Display Scale" button, when pushed, allows you to see levels in dBs. This scale can adapt itself according to the signal's level, therefore enabling an optimum visualization of the stereograph (the maximum available display space is fully used).
The speed of the automatic scale-length adaptation is set by the "Range Release" button, following the signal's level. If this button is set to 0 dB, then the scale length will stop changing, in the same way as on a real oscilloscope where the scale length is usually fixed.

As you can see it on the right-hand picture, the scale length allows you to evaluate the signal's level in a symetrical way on almost any axis of the graph. Moreover, it remains visible even as low as -120 dB (with 20 dB steps) and it can follow the signal's level as low as -180 dB, allowing you to visualize even the weakest digital audio noise.


Beam Behavior :


The first knob sets the time during which the beam remains visible on screen (the usual rule is that one would set this according to the display rate. With 20 frames per second, you would have to use a 50 ms setting).
The other knob gives the persistence time of the beam on screen. This can be handy when you have to detect very small distortions, for instance.


Contextual Menu :


This contextual pop-up menu will appear with a right click on the VIEW window.

From this menu, the user can change the display rate (frames per second).

By default, the window is set to ALWAYS VISIBLE mode. Although this can be switched off, the setting won't be saved like other parameters as it is only an additional feature.

In a big project, several instances of the VU meter may be used at the same time. To save the user from any confusion every View window can be named independently (e.g. Input 1, Output Master, etc).

Finally, when choosing DEFAULT OPTION, the user can access a general settings window allowing him to set the default colours and values. These settings will be saved with the project when closing it.


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