Bandpass filter for MP3 streams?

[ivellios1988]

In my radio I have a stream which broadcasts in MP3 with 128kbps. I'd like to reduce the amount of audible distortion in stereo signal, by cutting the audio bandwidth to, say, 14kHz or even 13kHz. Is there any way to achieve this in Liquidsoap?

[toots]

Hi! Have you considered using a ladspa high-pass filter for it? There's a comparison of some of them here it seems: https://forum.renoise.com/t/high-pass-filter-comparison-renoise-native-and-ladspa-with-pictures/21942

[smimram]

Also Liquidsoap features a number of filters. I'd advise using the butterworth filters such as filter.iir.butterworth.bandpass (or .high or .low depending on whether you want a high-pass or a low-pass filter).