AVR-Chat

Thanks, I have found that book online at http://www.dspguide.com

	Mark Jordan


On 19 Sep 2005 at 21:38, Larry Barello wrote:

> Do a Google search on Infinite Impulse Response filters.  
> 
> I first learned about them in the book "The scientist and Engineers guide to
> digital signal processing", Steven Smith.  Chapter 19, 20, ...
> 
> You can make pretty fancy filters by feeding forward and backwards several
> discrete time values (inputs and outputs).
> 
> I have never used anything more than a simple single order filter.
> 
> 
> -----------
> Larry Barello
> www.barello.net
> 
> 
> | -----Original Message-----
> | From: AVR-Chat@yahoogroups.com [mailto:AVR-Chat@yahoogroups.com] On Behalf |
> Of Mark Jordan | Sent: Monday, September 19, 2005 8:30 PM | To:
> AVR-Chat@yahoogroups.com | Subject: RE: [AVR-Chat] Sensor filtering | | On 11
> Sep 2005 at 14:15, Larry Barello wrote: | | > The weighted average filter is the
> digital version of a single | > stage RC filter. A weighted average filter looks
> something like | > this: | > | > Output = (prev_output - input)* K1 + input | >
> | > Where K1 is equal to e^-(dt/tau).  Dt = the sampling period and Tau is | the
> | > rise time desired (in seconds).  The frequency response is 1/2*PI*tau. | >
> Or, tau = 1/2*pi*frequency. | > | | 	Is there an 'easy to implement'
> second-order IIR filter formula? | | 	Thanks. | 	Mark Jordan | | | | | | |
> Yahoo! Groups Links | | | | | | 
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