Capture channels disorder

[hengsoo]

It all works but the captured channels are not in order. It is inconsistent for each recording. The channels orders are 1234, and sometimes 1278 or 5678. And I didn't encounter the ALSA overrun issue in #118.

Hardware: ReSpeaker 4-Mic Linear Array Kit for Raspberry Pi Driver Version: efa999f0f31d07c64cc00c6af51ad8df5a4893fc OS Kernel: 5.10.17-v7l+ Raspi 4

print("* recording")

frames = []

for i in range(0, int(RESPEAKER_RATE / CHUNK * RECORD_SECONDS)):
    data = stream.read(CHUNK)
    frames.append(data)

print("* done recording")

[HinTak]

FWIW, this has be reported multiple times, without resolution. Search for "channel swap" or something in the closed issues, and read them. It would be good to have an open issue collecting the back references, so if you find back issues, please collect and link them here.

Disclaimer: I don't work for Seeed Studio. Just another regular user.

[hengsoo]

Thank you for your info.

Related issues/comments : intermittently incorrect channel order #145 Random noise on one channel after a while #267 The related comment

[ghost]

@hengsoo , This action was performed automatically. Please describe the issue according to bug template - if the issue was resolved, ignore this message. The issue will be marked as closed in 7 days if inactive.

Describe the bug A clear and concise description of what the bug is.

To Reproduce Steps to reproduce the behavior:

1. Go to '...'
2. Click on '....'
3. Scroll down to '....'
4. See error

Expected behavior A clear and concise description of what you expected to happen.

Platform What platform are you running the code on.

• Device: [e.g. Raspberry Pi 4]
• OS: [e.g. Raspbian OS 32bit kernel version ...]
• Version/commit number [e.g. d1816f5]

Relevant log output Please copy and paste any relevant log output.

[AIWintermuteAI]

Hello, @hengsoo ! I wasn't able to reproduce the bug you're describing.

My setup: reTerminal (Raspberry Pi CM4 based development board) 5.10.17-v7l+ kernel https://github.com/respeaker/seeed-voicecard/commit/41a09a3b67dc476b9ae2111d319e6941c3d2f689 https://github.com/respeaker/4mics_hat/blob/master/recording_examples/record.py with channels modified to 4 and length modified to 10 seconds reSpeaker 4-mic hat for raspberry pi

Experiment: Play music from a speaker on reTerminal's right, block two microphones on the left.

Hypothesis: If channel order is inconsistent for every recording, I'd see sound and silence on different channels for different recordings when examining sound in audacity. If channel order is consistent for every recording, I'd see sound and silence on the same channels for different recordings.

Results: For all three recordings, the sound is on the channels 1 and 2, the silence is on channels 3 and 4. Recordings can be downloaded from shared Google Drive folder below: https://drive.google.com/drive/folders/1HNH3TyNPhryZSPb7ZsHp6IkxutRJb04p?usp=sharing

Conclusion: Cannot reproduce the behavior you described. Perhaps you can share more information about your setup?

[hengsoo]

Hello, @hengsoo ! I wasn't able to reproduce the bug you're describing.

My setup: reTerminal (Raspberry Pi CM4 based development board) 5.10.17-v7l+ kernel 41a09a3 https://github.com/respeaker/4mics_hat/blob/master/recording_examples/record.py with channels modified to 4 and length modified to 10 seconds reSpeaker 4-mic hat for raspberry pi

Experiment: Play music from a speaker on reTerminal's right, block two microphones on the left.

Hypothesis: If channel order is inconsistent for every recording, I'd see sound and silence on different channels for different recordings when examining sound in audacity. If channel order is consistent for every recording, I'd see sound and silence on the same channels for different recordings.

Results: For all three recordings, the sound is on the channels 1 and 2, the silence is on channels 3 and 4. Recordings can be downloaded from shared Google Drive folder below: https://drive.google.com/drive/folders/1HNH3TyNPhryZSPb7ZsHp6IkxutRJb04p?usp=sharing

Conclusion: Cannot reproduce the behavior you described. Perhaps you can share more information about your setup?

The mic I used is different from the one in your image. Mine is 4-Mic Linear Array Kit. For the setup I just followed the official guide . I have also run sudo apt-get install libasound2-dev libasound2-plugins to get the pyaudio working. And for the other 4 channels that ain't recording do contain some noises instead of total silence.

[AIWintermuteAI]

The mic I used is different from the one in your image. Mine is 4-Mic Linear Array Kit.

Oh, right, my bad. I'll test with Linear kit.

And for the other 4 channels that ain't recording do contain some noises instead of total silence.

Well, the sound isolation of my fingers against mic is not exactly 100% proof. Plus mic might have moved slightly.

[AIWintermuteAI]

Hello, @hengsoo !

Still not luck reproducing channel disorder with new setup: Raspberry Pi 4 1 Gb 5.10.17-v7l+ kernel 41a09a3 https://github.com/respeaker/4mics_hat/blob/master/recording_examples/record.py with channels modified to 8 and length modified to 10 seconds reSpeaker 4-Mic Linear Array Kit for Raspberry Pi

Here is the picture of setup - the orange circle is the location of the speaker during recording.

Same as with experiment before, I blocked two of the microphones on the right of Linear Kit and recorded 3 10 second segments. On all of them, channel 1 and 2 had some little static and channels 3 and 4 had the sound. There is some noise on the recording, possibly has to do with mic location (flat on the table, might be picking vibrations from the environment), but no inconsistencies in channel order.

Here are recording samples: https://drive.google.com/drive/folders/1HNH3TyNPhryZSPb7ZsHp6IkxutRJb04p?usp=sharing Under folder "linear kit".

Conclusion: Cannot reproduce the behavior you described. Perhaps you can share more information about your setup?

[AIWintermuteAI]

Hi @hengsoo ! May I inquiry, has the issue been resolved?

[AIWintermuteAI]

Closing the issue due to inactivity.

[edwbaker]

Still an issue with respeaker 6mic array - latest Raspbian and driver c526066.

[zhanglong97]

I have the same issue, The channel order changes every time the mic is turned on. has the issue been resolved?

Hardware: ReSpeaker 4-Mic Linear Array Kit for Raspberry Pi Driver Version: https://github.com/respeaker/seeed-voicecard/commit/c52606626de050bdad85803d7e427a64cb0cf05c OS Kernel: 5.10.103-v7+ Raspi 2