Extra exam question E8A04
Subelement E8, SIGNALS AND EMISSIONS· Group E8A
What is “dither” with respect to analog-to-digital converters?
- A.An abnormal condition where the converter cannot settle on a value to represent the signal
- B.A small amount of noise added to the input signal to reduce quantization noise (correct answer)
- C.An error caused by irregular quantization step size
- D.A method of decimation by randomly skipping samples
WhyDither is a small amount of noise added to an analog-to-digital converter's input signal to reduce quantization noise. Dither is a small amount of noise deliberately added to an analog-to-digital converter's input signal specifically to reduce quantization noise, breaking up the repetitive, correlated rounding errors that would otherwise appear as a distinct artifact in the digitized signal, answer B. It isn't a converter malfunction, isn't itself the quantization error, and isn't a decimation technique, dither is added before conversion specifically to improve the converted result.
Published 2026-08-28 · Last updated 2026-08-28 · Question text is verbatim from the 2024-2028 NCVEC Element 4 pool (public domain); the explanation above is original writing, see our methodology.
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