Use RPi 4b for Zoom video conference testing with different setup

From CMEE4K
Jump to navigation Jump to search
  • Use iPhone to start a Zoom meeting. Switch iPhone to LTE network to avoid local traffic congestion.
  • Use RPi 4b 2M, WiFi, USB remote keyboard and mouse.
    • Installed RPI Camera.
    • Use 32 bits Raspberry OS 2020 Feb version.

Use the following equipments

Zoom conference test

Test scenario
# RPi iPhone Remark
1 Use WebCam for video and voice conference
  • RPi cannot see iPhone video or freeze
  • voice is OK
iPhone sees low quality video because USB WebCam; voice conference is OK. RPi CPU spends time on USB camera, communication,
decode USB video signal, so RPi cannot handle the income iPhone video.
2 Use RPi camera and USB Mic
  • RPi sees iPhone video and voice is OK.
iPhone sees high quality video and voice is OK However, we need to push the USB Mic close to the mouth
otherwise iPhone cannot hear RPi
3 Use RPI camera and USB WebCam Mic
  • RPI sees iPhone video and voice is OK.
iPhone sees high quality video and voice is OK. WebCam Mic can pick up normal voice from 1.5 - 2 feet away.
  • No like the USB Mic which needs to close to the mouth.

Additional comments

  • Don't use VNC. RPi CPU cannot handle both Zoom and VNC in the same time.
  • The WiFi network may be too busy.



External USB Mic test

Using RPi Feb 2012 32 bits OS. The Voice Input is enabled and set to MAX.

  1. First test: Record a normal talk for 5 seconds around 12-14 inch away.
  2. Second test: repeat the first test
  3. Third test: move the Mic to 5-6 inch away.
# Picture lsusb, arecord -l, record message Remark
1 USB Mic.jpg
  • Bus 001 Device 007: ID 0000:0000
  • card 1: Audio [CBHT Audio], device 0: USB Audio [USB Audio]
  • arecord -D plughw:1,0 -d 5 mic1.wav
    Recording WAVE 'mic1.wav' : Unsigned 8 bit, Rate 8000 Hz, Mono

  • Sound level is low (level 1-2)
  • Voice is not clear
  • High background noise: static sound
  • For #2, same issues
  • For #3, the volume still low
2 USB Mic2.jpg
  • Bus 001 Device 008: ID 0d8c:013c C-Media Electronics, Inc. CM108 Audio Controller
  • card 1: Device [USB PnP Sound Device], device 0: USB Audio [USB Audio]
  • arecord -D plughw:1,0 -d 5 mic2.wav
    Recording WAVE 'mic2.wav' : Unsigned 8 bit, Rate 8000 Hz, Mono

  • Sound level is low (level 3-4)
  • Voice is only in acceptable level
  • Background noise is low, but has humming sound
  • For #2, same issues
  • For #3, volume is higher, but same background noise
3 MS WebCam.jpg
  • Bus 001 Device 009: ID 045e:00f5 Microsoft Corp. LifeCam VX-3000
  • card 1: camera [USB camera], device 0: USB Audio [USB Audio]
  • arecord -D plughw:1,0 -d 5 webcam1.wav
    Recording WAVE 'webcam1.wav' : Unsigned 8 bit, Rate 8000 Hz, Mono

  • Sound level is low (level 4-5)
  • Voice is not as clear as Mic 2
  • Background noise is low, has static sound
  • For #2, same issues
  • For #3, same noise issue, and volume is not changed
4 USB FlatMic.jpg
  • Bus 001 Device 010: ID 8086:0808 Intel Corp.
  • card 1: Device [USB PnP Sound Device], device 0: USB Audio [USB Audio]
  • arecord -D plughw:1,0 -d 5 usbmic1.wav
    Recording WAVE 'usbmic1.wav' : Unsigned 8 bit, Rate 8000 Hz, Mono

  • Sound level is high (level 6-7)
  • Voice is clear
  • Background noise has static sound
  • For #2, same issues & volume is high
  • For #3, voice is clear & volume is increased a bit