The noise has to do with gaps in the tread near the center of the tire. If there is constant tread there, as in many/most street tires, the tire will be silent on pavement. A tread like a knobby has large gaps, and will make noise, and possibly even cause vibration, when on pavement. The faster you go, the noisier they will be.
To answer the OP's question about a conversation, if there's an issue, just slow down until the issue becomes tolerable.