Low Pass Filter in Multi-Channel Delay Network: How to Add?

How can I add a low pass filter after each delay line in my multi channel feedback delay network

Muhsin Zerey asked: 2024-03-09 lowpass filtering , feedback , delay network , Signal Processing , Audio Toolbox

Implement a low-pass filter in your multi-channel feedback delay network in MATLAB! Learn how to add a filter after each delay line for enhanced audio effects.

Expert Answer

Kshitij Singh answered . 2025-07-07 09:55:15

Hi Muhsin,

In general, in order to perform filtering and listen to the output inside your for loop, you use filter System objects to perform filtering, and audioDeviceWriter to play the output.

The application you are working with is somewhat similar to a reverberation object that ships with Audio Toolbox:

audioexample.FreeverbReverberator. That objects internally uses a bank of allpass filters implemented using dsp.IIRFilter objects.

Here is a simple sample code of how to use the object to filter input data and listen ot the output in the loop.

% Process samples from an audio file
afr = dsp.AudioFileReader("FunkyDrums-44p1-stereo-25secs.mp3",PlayCount=Inf);
% The filter
r =  audioexample.FreeverbReverberator;
% Play the result
adw = audioDeviceWriter(SampleRate=afr.SampleRate);

while ~isDone(afr)
    x = afr(); % read an input frame
    y = r(x);  % filter the frame. the filter retains states between consecutive calls
    adw(y);    % listen ot the output frame
end

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