Dither is a technique used in digital signal processing and digital image processing to reduce the appearance of noise or to create the illusion of color depth in images with limited color palettes. Essentially, dither introduces small, random variations in data, which can help to smooth out transitions and create a more visually appealing or accurate representation. In the context of audio, dithering involves adding low-level noise to the audio signal before reducing its bit depth (e.g.
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dither is an intentionally introduced fluctuation that makes a quantizer's output vary between codes, reducing signal-correlated quantization artifacts. A suitable distribution can make the averaged code carry information about a constant voltage smaller than one conversion step. The improvement requires filtering or averaging; extra noise does not improve an individual conversion or repair arbitrary calibration errors.