AVR-Chat

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