LyraT 4.3 records peak noise with rare chance in repeating recording

donaldzeng
Posts: 3
Joined: Wed May 29, 2019 12:53 pm

LyraT 4.3 records peak noise with rare chance in repeating recording

Postby donaldzeng » Wed May 29, 2019 1:13 pm

Hi,

I am testing with a LyraT 4.3 board, and running example pipeline_wav_sdcard. Firstly the origin example was running great and record one .wav file each time I ran it.

Then I wrapped it to record repeatedly with an increasing number as .wav filename. Something strange was discovered that with a small chance, the L or R channel data may be corrupted with pike noise. Say I ran for 1000 recording files, I might get 20 to 25 files with corrupted data, either L or R. I never see L and R corrupted at the same time.

Some investigation has been done. I am pretty sure the whole modification is just for wrapping recording into a separate task, and not relative to pipeline itself. Looking into the .wav data, it seems the corrupted voice data caused by slipping 1 bit, and then LSB of one is regarded as MSB of the next.

Did someone ever see this phenomenon, or even have an answer/solution in place? Thanks a lot.

donaldzeng
Posts: 3
Joined: Wed May 29, 2019 12:53 pm

Re: LyraT 4.3 records peak noise with rare chance in repeating recording

Postby donaldzeng » Wed May 29, 2019 2:44 pm

with some corrupted .wav diagrams.

the diagram of L channel data corrupted
L-corrupted.jpeg
L-corrupted.jpeg (287.84 KiB) Viewed 204 times
the diagram of R channel data corrupted
R-corrupted.jpeg
R-corrupted.jpeg (279.82 KiB) Viewed 204 times
the diagram of zoom-in detail data corrupted
detail-of-corrupt.jpeg
detail-of-corrupt.jpeg (484.52 KiB) Viewed 204 times

jason.mao
Posts: 25
Joined: Mon Nov 19, 2018 2:05 am

Re: LyraT 4.3 records peak noise with rare chance in repeating recording

Postby jason.mao » Thu May 30, 2019 1:27 am

Hi donaldzeng,

Could you post you wav file at here? Does continuous recording different file can be reproduced?

donaldzeng
Posts: 3
Joined: Wed May 29, 2019 12:53 pm

Re: LyraT 4.3 records peak noise with rare chance in repeating recording

Postby donaldzeng » Thu May 30, 2019 1:51 am

Thanks for your quick reply. The problem, yes, can be reproduced in every long-time run, perhaps 1 or 2 time out of 100 times recording. I linked a wav file here: http://120.25.201.118/lotus/files/espbin/1304.wav.

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