Brick Wall LPF by Reducing Sampling Rate
Hi all,
I'm trying to create a brick wall low pass filter by lowering the sampling rate to twice the desired cutoff frequency. For example, to create a 10kHz brick wall, I would downsample to 20kHz.
I tried using the downsamp~ and degrade~ objects, but the results aren't what I'm expecting. The setup is really simple: pink~ > downsamp~/degrade~ > spectroscope~
Any idea what I'm doing wrong?
yes, you are trying to create a brick wall low pass filter by lowering the sampling rate.
Explain it to me like I'm five?
which source told you to use bitrate conversion to build a frequency filter? there are dozens of approaches, but changing the sample rate is not one of them - not even if the DAC itself would have a lowered sampling rate this would be of help here.
what make a low pass is interpolation (slide~ object), but that only gives you 3db per octave.
Downsampling is not going to low-pass filter your signal.
To create an approximation of a brickwall filter, you could build a high-ish order butterworth or Chebychev-2 using [filterdesign].
Got it, thanks all.
