A teleconferencing system for voice and data provides interconnections among user sites via a central station. A pump unit having a can of this type is also provided. An additional data generator is configured to extract synchronization of the broadcasting signal from the extracted broadcasting signal, modulate the additional information based on the extracted synchronization, and generate a level of the modulated additional information to be a smaller level than a signal level of the modulated signal by as much as a predetermined value. In an embodiment, a launcher engages the channel assembly to aid in throwing the ball. The responsibility of transforming the ink into desired coordinates occurs after the capture of the ink and at least based on the mapping in the data structure. A cooling medium enters the interior void space of the roller, passes through and exits again.