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Dither
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Definition
Dither is a type of intentional variation (noise) which is added to a digital audio signal to avoid quantization error.
Dithering in audio
Dither is used when a digital signal is being created or modified. This prevents distortion associated with quantization, especially intermodulation distortion, which occurs between the audio and the sampling frequency.
Dithering test tones
The tones used for testing were dithered when they were created to prevent inter-modulation distortion. The signal generator creates very high-resolution digital audio test-tones (at least 32-bit), then dithers to the word-length specified (16 or 24-bit). If it is not dithered, inter-modulation occurs between the sample-rate and the test-tone frequency(s) when the word-length is reduced.
