03 Side Project 1 – Visualising Basic Waveforms on an Oscilloscope

To begin the practical aspect of this project, I’d first like to show some visualisations of basic waveforms in the standard voltage v time mode on an oscillator. Each of the waveforms used are cyclic, meaning that they are able to be repeated seamlessly forever and this will be visualised. First, the most basic cyclic waveform is a sine wave (or sinusoidal). This is the basis for each of the other waveforms that will also be used.

Visualisation of a sine wave:

sine

Visualisation of a triangle wave:

triangle

Visualisation of a square wave:

square

Visualisation of a sawtooth wave:

sawtooth

By using these waveforms in a stereo setting with an oscillator in x-y mode, they start to look a little different. As seen in my previous blog post on this topic, x-y mode works to visualise a resultant shape of the left and right audio channels. Below is a diagram depicting each of the resultant shapes of a sine wave at different phase positions.

lissajous20picture

Here is a short demonstration video on how to accomplish these different shapes using a synthesiser.

 

 

 

References

Basic Audio Wave Shapes. (2017). Public.wsu.edu. Retrieved 9 December 2017, from https://public.wsu.edu/~jkrug/MUS364/audio/Waveforms.htm

Fenderson, J. (2017). https://www.youtube.com/watch?v=qnL40CbuodU.

How do I utilize the XY display feature on a DPO/MSO/MDO4000 Series oscilloscope? | Tektronix. (2017). Tek.com. Retrieved 9 December 2017, from https://www.tek.com/support/faqs/how-do-i-utilize-xy-display-feature-dpo-mso-mdo4000-series-oscilloscope

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