7 ms·
This makes no sense though? Given the Nyquist theorem, simply increasing sampling frequency past a certain step doesn't change the outcome.
by Etheryte 9mo ago
This makes no sense though? Given the Nyquist theorem, simply increasing sampling frequency past a certain step doesn't change the outcome.
- labcomputer 9mo agoActually, it does. You can decimate the higher sample rate to increase dynamic range and S/N ratio. Also, for direct down conversion, you can get better mirror frequency rejection by oversampling and filtering in software.
- Etheryte 9mo agoNone of this changes the actual real amount of data you have at the end of the day though after all is said and done, that's what I mean, so long as you don't botch it and capture too little. In computing terms, the amount of real data in a compressed archive and the uncompressed original is the same, even if the file size is larger for the latter.
- touisteur 9mo agoSorry, not sure I follow from what I said (explaining how much data sensors produce) to 'increasing the sampling frequency' ? You're usually sampling at larger width to then put specifically taylored pass-band filter and removing aliasing effects and then downsampling. This is a classic signal acquisition pattern : https://dsp.stackexchange.com/questions/63359/obtain-i-q-components-from-a-real-signal-on-the-fly-hilbert-transform-or-digit https://dsp.stackexchange.com/questions/63359/obtain-i-q-com...