[opus] High noise after encoding/decoding procedure

[Aleksandr Mikoff]

Hello everyone.

I have a problem with a high level of noise after opus encoding/decoding
procedure. If I stream a raw data from the microphone and send it back to
the speakers I hear the clear sound (with a small delay).
If I encode each frame, decode it and send it back to the speakers I hear a
very noisy signal - it is so large, so it is almost impossible to
distinguish words in my speech...
Should I preprocess the raw pcm data somehow before feeding it to the opus?
Is it ok, that I changed few parameters in "defines.h" file (to suppress
the RAM requirements - I have only 60 KB RAM free on my STM32 board)? I
changed the ENCODER_NUM_CHANNELS 1 and DECODER_NUM_CHANNELS to one,
and MAX_FS_KHZ to 8.
In the code I forced the codec to use SILK mode and to have only one
channel.

I would be happy for any feedback - where to start and what to check the
first.
Thanks!

WBR,
Aleksandr
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