Abrupt start to audio

[uselessgames]

respeacker 2 mic

there is an abrupt start to the audio followed by no sound.

I have tried different filters on alsa and ladspa with no success.

This is causing problems in the AI.

How to fix?

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[ghost]

@uselessgames ,
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[AIWintermuteAI]

Hello, @uselessgames !

I am able to reproduce the problem you described with the following setup:
Raspberry Pi 4 1 Gb
5.10.17-v7l+ kernel
b595b95

Here is three samples I recorded with 2-mic hat - I was speaking before I started recording and I can see a strange upward curve on 0 - 0.1~0.2 segment of the recording.

I'll keep the issue opened and mark it as a known bug. For sound recognition applications, as workaround, the following can be suggested:

• if you do keyword recognition, record audio continuously, then you won't get abrupt start of the audio
• if you do speech recognition, you can omit first ~0.1-0.2 seconds of the audio programmatically so they wouldn't influence the recognition quality. Most of current Deep Leaning algorithms should be able to handle slight noise correctly though and just ouput "silence".