Hi

I am new to Pure Data, 

I downloaded and have played around with it for the last couple of days and it is rather wonderful.

I can quite happily create a basic synth inside it without too much strife.

:)

However

The reason I wanted to use Pure Data was to implement some of the maths that I am learning through a couple of DSP books that I am studying.

The DSP book I have read gives a simple lowpass filter function as 

g(n) = (f(n-1) + f(n) + f(n+1))/3

i.e the average value of three consecutive samples. I understand how this is in effect a lowpass filter.

How do I implement that in PD?

I can easily connect a Oscillator (phasor) object to a lowpass filter object to the DAC and hear it working,

However I want to be able to create my own lowpass filter i.e. try to really understand how things are put together.

Therefore if in the function above I need 3 consecutive samples, I would have thought that I need some kind of buffer to hold and call those samples from, 

so that I can then call three samples average them and then output that, however that would have to move at the same rate/freq as the audio engine is set up i.e. 44100Hz ..... errrr.

So I am thinking about how to solve the problem I just seem to be missing how to start.

Any guidance appreciated.

geoff