Techniques described herein include the use of equalization techniques to improve intelligibility of a reproduced audio signal. The method includes determining, from received packets, at least one characteristic of at least one end user device connected, through an end user communication terminal, to the communication network. In another embodiment of the invention, a virtual marketplace provides for the owners of truck bodies with the banner mounting hardware to register their truck bodies if they are willing to allow banner advertisements to be placed on their truck bodies. They thereby irradiate on the surface of the substrate an irradiation field, which is divided into a drying zone and a sintering zone arranged downstream of the drying zone in the transport direction. With the heat dissipation structure, the heat source can have largely increased self heat radiation efficiency, enabling heat emitted by the heat source to be quickly dissipated into ambient environment to avoid heat accumulation on the heat source.