LyraT 4.3 records peak noise with rare chance in repeating recording

[donaldzeng]

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]

with some corrupted .wav diagrams.

the diagram of L channel data corrupted

L-corrupted.jpeg (287.84 KiB) Viewed 58994 times

the diagram of R channel data corrupted

R-corrupted.jpeg (279.82 KiB) Viewed 58994 times

the diagram of zoom-in detail data corrupted

detail-of-corrupt.jpeg (484.52 KiB) Viewed 58994 times

[jason.mao]

Hi donaldzeng,

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

[donaldzeng]

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.

[CyprienAmigon]

Hi,

I'm facing exactly the same issue. I'm recording audio in several .wav files and some of them are randomly getting corrupted.
Just like the author, in some of my records (like 1 on 50 files) there are plenty of pikes at a maximum amplitude. I'm running a custom software, but the recording task is very similar to the example "pipeline_recording_to_sdcard" of ESP-ADF.
Did you find a solution ?

[CyprienAmigon]

No news ?

[ESP_Minatel]

Hi,
Can you share more details?