Wolfgang wrote:> Hello Jerry, > > >>Can you pick out the peaks before the initial downsampling? It would be >>nice to use the information before you thin it and then have to fill it >>in again. > > > Yes your're right. Only things against it: > 1.) I filter to cut out higher frequency content as it is noise. > 2.) The filtering and downsampling is done in another DSP and the stream of data > is constantly transmitted (don't want to implement a special max-data transfer). > 3.) Hopefully this value is only required for comparison. And later through'n out. > > But I'll have a try with the formulas for precise reconstruction given by Clay Turner > and see if this can be implemented using just some points around the peak. > > Many thanks, Wolfgang > > >>-- >>Engineering is the art of making what you want from things you can get. >>����������������������������������������������������������������������� > > But why do Managers don't understand that ? ;-)Wolfgang, Normally, filtering and decimating is done in one step for efficiency. It is probably more efficient to filter and decimate separately than it is to combine the operations and then interpolate. There is no choice if you have only the decimated data, but there might be good savings if you can re-order your operations. Jerry -- Engineering is the art of making what you want from things you can get. �����������������������������������������������������������������������
Measuring Peak Value
Started by ●September 7, 2004
Reply by ●September 14, 20042004-09-14
Reply by ●September 17, 20042004-09-17
If you are decimating looking for peak values, why wouldn't you be doing high value ORing? Or peak picking? In article <4146fcad$0$2670$61fed72c@news.rcn.com>, Jerry Avins <jya@ieee.org> wrote:>Wolfgang wrote: > >> Hello Jerry, >> >> >>>Can you pick out the peaks before the initial downsampling? It would be >>>nice to use the information before you thin it and then have to fill it >>>in again. >> >> >> Yes your're right. Only things against it: >> 1.) I filter to cut out higher frequency content as it is noise. >> 2.) The filtering and downsampling is done in another DSP and the stream of > data >> is constantly transmitted (don't want to implement a special max-data > transfer). >> 3.) Hopefully this value is only required for comparison. And later through'n > out. >> >> But I'll have a try with the formulas for precise reconstruction > given by Clay Turner >> and see if this can be implemented using just some points around the > peak. >> >> Many thanks, Wolfgang >> >> >>>-- >>>Engineering is the art of making what you want from things you can get. >>>����������������������������������������������������������������������� >> >> But why do Managers don't understand that ? ;-) > >Wolfgang, > >Normally, filtering and decimating is done in one step for efficiency. >It is probably more efficient to filter and decimate separately than it >is to combine the operations and then interpolate. There is no choice if >you have only the decimated data, but there might be good savings if you >can re-order your operations. > >Jerry
