Smoothing audio output of filters applied frame by frame

Hello everyone,

I have a bank of N FIR filters. I want to use ach one of them to filter a each of the N frames of an audio signal. My code is something like this:

for i = 1:N
    audioFrame = audioSignal(1 + (I - 1)*frameLength:I*frameLength);
    audioOutFrame(:, I) = fftfilt(filterBank(:, I), audioFrame);
end

audioOut = audioOutFrame(:);

In the end, both audioOut and audioSignal are column vectors of the same length (N*frameLength). The problem is that when I playback audioOut (using the sound function, for example), it sounds... "glitchy" (there is a periodic pulsating-like noise).

When I zoomed to look what whats happening with audioOut, I found that the transition of the frames was "too rough".

If anyone coud guide me on how to fix this problem. I would gladly appreciate it. Thanks in advance.

[Mathieu NOE]

hello

I wonder if using filter instead of fftfilt would reduce the transients at start / end of buffers

second, if the problem persists, why not doing a kind of moving average of a few samples where end of previous buffer joins the start of the next buffer

attached a moving average window filter code