https://github.com/endolith/scopeplot

Oscilloscope-like plotting of waveforms
https://github.com/endolith/scopeplot

audio-visualizer oscilloscope plotting waveform

Last synced: 7 months ago
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Oscilloscope-like plotting of waveforms

• Host: GitHub
• URL: https://github.com/endolith/scopeplot
• Owner: endolith
• Created: 2016-01-26T01:20:52.000Z (over 9 years ago)
• Default Branch: master
• Last Pushed: 2022-10-19T18:52:26.000Z (over 2 years ago)
• Last Synced: 2024-08-05T06:05:39.760Z (10 months ago)
• Topics: audio-visualizer, oscilloscope, plotting, waveform
• Language: Python
• Size: 69.3 KB
• Stars: 24
• Watchers: 6
• Forks: 5
• Open Issues: 0
• Metadata Files:
  • Readme: readme.md

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README

        
Oscilloscope-like plotting of signals, showing density of waveforms instead 

of just the peak amplitude silhouettes.

Vertical cross section through this plot is a histogram of the waveform values 

for that chunk as brightness.

Input signal must have been sampled at twice the highest frequency present in

the signal, like audio.

Signal is first FFT interpolated to get inter-sample information, then broken

up into overlapping chunks, 1 for each pixel, then those are linear

interpolated, with each line segment contributing to 1 or 2 pixels, depending

on where it occurs in the chunk.

To do

-----

- Handle line segments that go outside the visible range

- Handle circularity/end behavior as a parameter

 - Fix white dots at endpoints

- Read files one chunk at a time, FFT resample each chunk to avoid memory errors

- Show original samples as circular dots when zoomed in enough

- Show RMS value (window parameter?)

- Show (intersample) peak value

- Color the waveform based on spectral centroid, spectral content, etc.

- Use randomized resampling?  Completely different, though.

Related

-------

- https://github.com/endolith/freesound-thumbnailer  

- http://dsp.stackexchange.com/q/184/29

Examples

--------

Guitar pluck:

[![plot of guitar](https://farm1.staticflickr.com/306/19701397555_58444c1ee0_z.jpg)](https://flic.kr/p/w1WP7c)

Violins:

[![plot of violins](https://c1.staticflickr.com/5/4741/39004191465_3a6908f435_z.jpg)](https://flic.kr/p/22qEFeK)

Sine wave:

[![plot of sine](https://farm1.staticflickr.com/417/19201290270_a91a64774e_z.jpg)](https://flic.kr/p/vfKCCN)

Noise:

[![plot of noise](https://c1.staticflickr.com/1/395/19112954693_bc4a597098_z.jpg)](https://flic.kr/p/v7WTxB)

Triangle wave chirp showing it can deal with low-frequency waves, too:

[![plot of triangle chirp](https://live.staticflickr.com/427/19078876704_5380c50eda_z.jpg)](https://flic.kr/p/v4Wem5)