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If you're really generating a pure sine, you know the amplitude and can force the peaks of a half-cycle to draw at the intended peak. If the waveform is more complex, you can generate it at a sufficiently high sample rate. The issue with drawing is that you can't necessarily plot consecutive samples and still have enough of the waveform in view, horizontally,...


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For a given «visual accuracy», you need to sample the sine at a sufficient number of time-steps per period. At some point the display pixel density will be to low to render a sine accurately. For waveform editors (that usually have access to only a finite rate sampled waveform, not a continously defined trigonometric function), I assume that some practical ...


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I haven't looked at the reference yet , but just to answer the question, yes filtering is performed prior to down sampling to avoid aliasing back in the out of band signals. However if your signal is already appropriately bandlimited you could forego the filter entirely. There's various reasons you might want to do other, unrelated, filtering after the ...


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