I am confused about the relationships between seismic LP filtering, A/D and SPS. Suppose I have an 8 pole bessel filter with a -3 db point of 10 Hz and a 16 bit A/D. Log10(2^16)=4.81, so in power that is 96 db dynamic range. My 8 pole bessel response is down 96 db at about 80 Hz. So I should sample at a minimum of 160 Hz to avoid aliasing that will screw up my lowest bit ? Similarly, for a LP of 1 Hz I should sample at a minimum of 16 SPS? This seems to be a lot higher SPS than most folks are using. Can we assume the seismic spectra naturally falls off at higher frequencies so that we do not have to depend on our LP filter at higher frequencies? Or is my math screwy? Confused, Dave Saum __________________________________________________________ Public Seismic Network Mailing List (PSN-L)
Larry Cochrane <cochrane@..............>