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20-bit filter arithmetic is quite plausible for ADSL. This is based on the typical width of the input from the ADC and the well-known fact that many filter algorithms need an accuracy larger than the data by a few bits. I'll remove the citation-needed tag. --Rainald62 (talk) 16:48, 7 December 2016 (UTC)
^, quote from p. 7: "Starr, Cioffi and Silverman [19, p. 299] recommend using 14-bit ADC, while ADSL transceivers commonly use 16-bit ADCs. Fixed-point DSPs commonly use more than 16-bit fixed-point arithmetic."