With the usual 14 or 16 bit A/D's, is that dynamic range necessary?
Bob


ChrisAtUpw@....... wrote:

> In a message dated 08/01/2007, royb1@........... writes:
>
>     There us currently a digital Rockland on ebay but it looks
>     expensive and
>     I don't know the specs.  The analog version comes up occasionaly.
>
> Hi Bob,
>  
>     I haven't read the data manual for a Rockland Digital Filter, but 
> the problem with digital filters for seismic use has previously been 
> their low dynamic range. They are simply too noisy and may give less 
> than 80 dB, where over 120 dB would be desirable. 
>  
>     Regards,
>  
>     Chris Chapman
>
>
> __________ NOD32 1966 (20070109) Information __________
>
> This message was checked by NOD32 antivirus system.
> http://www.eset.com

__________________________________________________________

Public Seismic Network Mailing List (PSN-L)