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I am using rpi4b with raspbian dated dec 2020 and seeed respeaker mic hat 2 and notice there is an abrupt start followed by some silence to the audio.

Here is a sample with a simple test arecord -D plughw:1,0 -f S16_LE -r16000 file.wav

image.png

I have tried applying some filters using ladspa (delay and fadein) and other alsa configurations without success.

Does anyone have any ideas on how to fix this?

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You should use the Raspberry Pi OS 2021-01-11. As stated in the Release notes there are some important bug fixes belonging to audio.

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  • not quite, still shows, here are two tests image.png
    – gSaenz
    Commented Jan 17, 2021 at 13:47

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