White background wallpaper
White background wallpaper does not establish webcam microphone quality. See what information is missing for a supported answer about speech capture.
White background wallpaper concerns visual appearance. It does not establish which microphone is capturing your voice or how clearly that microphone records speech.
What this means for webcam audio
If your goal is clearer speech during webcam calls, the relevant starting point is the microphone selected in your calling application. A wallpaper choice provides no evidence about that audio input.
No webcam model, microphone settings, compatibility documentation or recording evidence was supplied. There is therefore insufficient information to assess speech quality or recommend a specific audio adjustment. A wallpaper recommendation is also unsupported because no image options or display requirements were provided.