Words4EV.speak 1.0 (en)

Humming

Humming is a low or very low frequency sound (~40Hz), making its restitution difficult with conventional audio system. It has a high level, a motor-harmonic behavior and might be discontinuous during acceleration phases. It is oppressing and create a feeling of pressure on eardrums, similar to an underwater sensation, it leads to a lot of fatigue. Humming reminds combustion engines and highlights defaults. This is a solidborne noise emitted by one or several panels in the cabin. Humming is similar to wing flapping of a bumblebee or to "Drumming" in its sonority.