In digital filtering, decimation is a reduction of sample rate, truncation is a reduction of precision. Interpolation can refer to either of the opposite processes. The terms downsampling and upsampling can be used to avoid confusion with regards to sample rate. I am trying to come up with an adequate term for improving precision. Averaging is one form, but not inclusive.
David N1HAC On 1/10/19 7:59 AM, Magnus Danielson wrote: > Peter, > > While the word derives back to the Roman times, today it is a > technical term for data-reduction being used in professional > literature, so it's meaning has already been established. > > For instance, in modern phase-noise measurement setups the sample-rate > is around 100 MS/s, and that sample-rate of multiple ADCs with > relatively high amounts of bits is way to high to hand over to > software, so it is decimated down in steps in FPGA before handing over > to software. Decimation is the term used in that context. > > Cheers, > Magnus > > On 2019-01-10 13:01, Peter Vince wrote: >> In his comment below, Mark has used the word "decimate". There is much >> debate about what this word means (presently, and/or in the past), but >> common explanations refer back to Roman times when they apparently >> killed >> one person in ten as a punishment, and similarly "tithes" - or taxes, >> where >> one in ten was taken. Now OK, you can argue this until the cows come >> home, >> but the result is that the meaning isn't crystal clear, and >> particularly on >> a technical forum where precision is paramount, and the entire reason we >> are here, I believe accuracy and clarity of expression is also >> important. >> In this instance, I believe "truncate" would be a better word. >> >> </rant> :-) >> >> Regards, >> >> Peter Vince >> >> On Wed, 9 Jan 2019 at 23:56, Mark Sims <[email protected]> wrote: >>> ... >>> And as far as decimating the TICC output values in firmware... please >> don't. Let the user decimate the values if they want to. >> _______________________________________________ >> time-nuts mailing list -- [email protected] >> To unsubscribe, go to >> https://na01.safelinks.protection.outlook.com/?url=http%3A%2F%2Flists.febo.com%2Fmailman%2Flistinfo%2Ftime-nuts_lists.febo.com&data=02%7C01%7Cdavid.g.mcgaw%40dartmouth.edu%7C74704d9a96784bf564e908d676fbc06b%7C995b093648d640e5a31ebf689ec9446f%7C0%7C0%7C636827221015810655&sdata=ixTtAGjUfM%2BFSNAKiLGWm9wm%2F9EQh2%2FnPmkFp80dWNI%3D&reserved=0 >> and follow the instructions there. > > _______________________________________________ > time-nuts mailing list -- [email protected] > To unsubscribe, go to > https://na01.safelinks.protection.outlook.com/?url=http%3A%2F%2Flists.febo.com%2Fmailman%2Flistinfo%2Ftime-nuts_lists.febo.com&data=02%7C01%7Cdavid.g.mcgaw%40dartmouth.edu%7C74704d9a96784bf564e908d676fbc06b%7C995b093648d640e5a31ebf689ec9446f%7C0%7C0%7C636827221015810655&sdata=ixTtAGjUfM%2BFSNAKiLGWm9wm%2F9EQh2%2FnPmkFp80dWNI%3D&reserved=0 > and follow the instructions there. _______________________________________________ time-nuts mailing list -- [email protected] To unsubscribe, go to http://lists.febo.com/mailman/listinfo/time-nuts_lists.febo.com and follow the instructions there.
