Here’s an example from the documentation, showing the case where the sample values are all zero but for a single sample with value 1: In Sonic Visualiser v3.2 it’s now possible to zoom closer than one pixel per sample, and we show the signal oversampled between the sample points using sinc interpolation. More recent versions show sample points on separate stems without connecting lines.) Older versions of Audacity connected the sample points with straight lines, a decision which attracted criticism as misrepresenting how sampling works. (In a waveform editor like Audacity it is necessary to be able to interact with individual samples, so some decision has to be made about what to show between the sample points when zoomed in closely. It also sidestepped any awkward decisions about how, or whether, to show a signal in between the sample points. Why this limitation? It allowed an integer ratio between samples and pixels to be used internally, which made it a bit easier to avoid rounding errors. It’s a bigger problem with hi-dpi and “retina” displays, on which individual pixels can’t always be made out. This isn’t such a big deal with a lower-resolution display, since you don’t usually want to interact with individual samples anyway (you can’t edit waveforms in Sonic Visualiser). Here’s what that looks like - this is the closest zoom available in v3.1 or earlier: Waveform interpolationĮver since the Early Days, the waveform layer in Sonic Visualiser has had one major limitation: you can’t zoom in any closer (horizontally) than one pixel per sample. The theme of this release could be said to be “oversampling” or “interpolation”. This one, version 3.2, has some significant visible changes, in contrast to version 3.1 which was more behind-the-scenes. Another release of Sonic Visualiser is out.
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