Check the differential fluid level.
If noise is louder when windows are open it is generated in the power train.If the noise is heard with windows closed but disappears when you rolled windows down, the noise is road/wind/tire related. If noise changes with road surface - this is tire noise.The torque converter noise is not common on Camrys. Such noise is loudest at take-off and should sease above 50 mph, when converter is locking up.
Drive the car at 38mph at 2nd, D and o/d. If it still present at 38 mph, suspect above mentioned components.
Warped brake rotor / separated brake pads produce pulsating howl at float condition, and disappear when brakes applied.