Had a similar issue with my daily commuter car. Noise got louder with road speed and not affected by engine revs
Turned out to be a very dry wheel bearing.
It could also be 'feathering' on tyre tread. Usually happens on cheap tyres. Check the tyre tread pattern for different heights on tread block. Or if you have them, swap over to another set of wheels to eliminate the tyre issue.
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