Filters

[Ben Stuyts]

On Tue, 12 Jan 1999, Ian Fritz wrote:

> Hal Chamberlin's book shows how to do this. First, you make a diagram of
> the (analog) filter's topology, using integrators, amplifiers and
> summers.  Then for the digital implementation you just need to realize
> that a digital integrator is implemented by summing an input signal with
> a delayed version of itself: y(n) = x(n) + y(n-1). A state variable
> filter requires five additions and three multiplications per time step.
> Six lines of BASIC.

Right, that's exactly what I meant. Duh, I knew it couldn't be original.

Is that book still available?

Ben