Hello,
I have some issues with with the noise reduction example using aloop.
When I record after an “aplay” command, I have a big initial pop in my recording.
For example:
aplay phrase.wav
sox -d -t wavpcm -c 1 -b 16 -r 16000 -e signed-integer --endian little record.wav trim 0 1
Then in my file record.wav, there is a big pop at the beginning that you can hear with aplay.
If I record twice in a row, then the second file is good, meaning:
aplay phrase.wav
sox -d -t wavpcm -c 1 -b 16 -r 16000 -e signed-integer --endian little record.wav trim 0 1
sox -d -t wavpcm -c 1 -b 16 -r 16000 -e signed-integer --endian little record2.wav trim 0 1
The file record.was has the pop but the file record2.wav is good (no initial pop in it).
I hope that you can reproduce and let me know how to fix this because it is causing problem when submitted next to the ASR.
Moreover, I noticed big variation in the volume of my recording. It varies from one recording to another but sometimes within the recording itself (e.g. starting loud and finishing low). I played with the agc parameter and even disable it but without any luck.
Thanks for your help