Hi, I have a problem with some USB microphones. I’m recording audio with this pipeline: gst-launch-1.0 -v alsasrc device=hw:1,0 ! capsfilter caps=audio/x-raw,format=S16LE,layout=interleaved,rate=48000,channels=2 ! filesink location=file.raw When the microphone is connected to the no-OTG USB port…

Hi, For TK1, the latest release is https://developer.nvidia.com/linux-tegra-r217 As of now there is no plan to have new release. Please check ehci driver in kernel source: https://developer.nvidia.com/embedded/dlc/sources-r217 And also compliance tuning guide: http://developer.nvidia.com/embedd…

Hi linuxdev, I noticed something strange that maybe can help to understand the problem. The Devio CR-1 mic it is a full-speed device (you can see it lsusb -t output) and it supports 8000, 16000, 24000, 32000, 44100 and 48000 rates: cat /proc/asound/card1/stream0: Biamp Systems Devio CR-1 USB Audi…

Sample rates and differences in how samples are interpreted can indeed cause such noise, but I don’t know enough about it to say if this particular difference would be an issue. Certainly interference from outside noise (such as a ground loop) can be dependent upon sample rate, but the “Endpoint” di…

Hi, We have Plantronics Blackwire C220-M. Please share steps and we can try it. Are you on r21.7?

Besides, you may consider using Jetson Nano to have latest BSP release.

Hi DaneLLL, I don’t know if the problem appears also with the Plantronics Blackwire C220-M, I observed this with the Devio CR-1 USB Audio device. To test it, just try to capture with gstreamer with 48000 rate, both on the USB type-A host-only port and on the USB micro-AB OTG port. On the OTG port…

Hi DaneLLL, sorry for the delay. At the moment I don’t have the Devio CR-1 device anymore, so I can’t test it with a new OTG adapter. I will update you as soon as possible. Thank you, best regards. Ivan

Hi DaneLLL, I re-open the topic because I have been able to test just now the Devio CR-1 behaviour with a direct OTG adapter ( https://www.amazon.it/Joyshare-Adattatore-maschio-Argento-Confezione/dp/B01KHSP27U ). I have noise also with this adapter when the device is managed through the ehci drive…

Hi, Since we observe the issue with certain cables, it tends to be an issue in hardware singal. Suggest you check the D+/D- signals via scope. May also tune eye diagram by following tuning guide. http://developer.nvidia.com/embedded/dlc/tegra-k1-USB-2-Compliance-Test-Tools

Hi DaneLLL, I find it strange that it tends to be a hardware signal issue, the noise appears on three different boards, from three different producers (Toradex, Embpower and PC Partner) and on all the USB ports that are managed through the ehci driver. At this moment I’m not able to check the USB …

Noise with some microphones connected to the USB OTG port

Robotics & Edge Computing Jetson Systems Jetson TK1

DaneLLL March 26, 2019, 8:26am 24

Hi,
Could you try other OTG adapters? We can observe noise issue with OTG cables. But with the direct OTG adapter as attachment, the issue is gone.

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Noise with some microphones connected to the USB OTG port

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