build/bin/quiet_decode_file run well but decode nothing

[songfuture]

when learn quiet, I have encountered such a problem，build/bin/quiet_decode_file run well but decode nothing，the detailed steps are as follows。Could you help me analysis， Is it the problem of using quiet steps or other problems(maybe noise,device,or other something)？please
Learn quiet encoding and decoding file through the following steps:
1.generate txt file;
2.build/bin/quiet_encode_file encode txt file generated by first step ;
3.use speaker play the wav file (44100kHZ ,32-bit Floating Point PCM) generated by second step in a quiet environment;
4. use microphone receive the sound (44100kHZ ,32-bit, wav format)
5. build/bin/quiet_decode_file decode wav file generated by fourth step ,problem begin to emerge，quiet_decode_file work well but decode nothing.