A preferred embodiment of the present invention provides a basketball goal assembly. The filter is mounted for rotation with respect to the output of the light guide. The set of data is divided into a first data subset and a second data subset. The apparatus additionally includes an insulating shroud that lines an interior of the chamber, the insulating shroud being configured to be electrically floating during the processing. Inside the connection between mouthpiece and connecting tube is attached a readily detachable filter.