Hi, 3 questions:- 1. I know IIR Filters are used for audio, but are there applications where IIR filters are used in higher sample rates. For example do IIRs get used in the MHz range. 2. Can I minimise the non-linear phase characteristics of the IIR? 3. Is there a good book that delas with digital filter architectures? Mike This message was sent using the Comp.DSP web interface on www.DSPRelated.com
High sample rate IIR Filters
Started by ●May 23, 2005
Reply by ●May 24, 20052005-05-24
On Mon, 23 May 2005 05:52:51 -0500, francis <m2francis@aol.com> wrote:> Hi, > > 3 questions:- > 1. I know IIR Filters are used for audio, but are there applications > where IIR filters are used in higher sample rates. For example do IIRs > get used in the MHz range. >The limiting factor is machine cycles. It's tough to keep up with MHz. Fortunately, much of the time, we're interested in a chunk of the bandwidth, so we can decimate accordingly.> 2. Can I minimise the non-linear phase characteristics of the IIR? >http://www.dspguide.com> > 3. Is there a good book that delas with digital filter architectures? >http://www.dspguide.com
Reply by ●May 24, 20052005-05-24
in article mNwke.244524$cg1.110555@bgtnsc04-news.ops.worldnet.att.net, Charles Krug at cdkrug@worldnet.att.net wrote on 05/23/2005 23:00:>> 1. I know IIR Filters are used for audio, but are there applications >> where IIR filters are used in higher sample rates. For example do IIRs >> get used in the MHz range. >> > > The limiting factor is machine cycles. It's tough to keep up with MHz. > Fortunately, much of the time, we're interested in a chunk of the > bandwidth, so we can decimate accordingly.another problem with high Fs (if the frequency specs remain the same) is that coefficient precision and quantization can be a problem in a fixed-point implementation.>> 2. Can I minimise the non-linear phase characteristics of the IIR? >> > > http://www.dspguide.comlook up Bessel (and similar) filters. and look up all-pass filters for delay compensation.>> 3. Is there a good book that delas with digital filter architectures? >> > > http://www.dspguide.comand practically any DSP or digital filtering textbook. -- r b-j rbj@audioimagination.com "Imagination is more important than knowledge."
