Mayou

The following object is a recursive lowpass filter.

Inlet 2 : Cutoff Frequency (between 0 and 1)

- How can I get the cutoff frequency in Hz ?

- How can I transform this filter to a recursive highpass filter ?

- How can I get the output exactly synchronized with the input ?

The following object is a recursive lowpass filter. 

Inlet 1 : data x
Inlet 2 : Cutoff Frequency (between 0 and 1)

- How can I get the cutoff frequency in Hz ?
- How can I transform this filter to a recursive highpass filter ?
- How can I get the output exactly synchronized with the input ?

recursive-low-pass-filter-on-a-continuous-data-stream

Another question which might help me would be : How can I use Biquad~ object on a data stream instead of a sound signal ?

I think that with "inlet 2" = a we have :

H(z)= (1-a)/(1-(a/z)) with a = 1-(f/fs), fs : sampling frequency.

Then if a = 0 then the lowpass filter does not do anything

if = 1 then the low pass filter cuts all the frequency

ps : with y[n]=(1-a)*x[n]+a*y[n-1], am I right ?

Recursive Low Pass Filter on a continuous data stream