Abstract: A single piece, high impact resistant plastic foam helmet having a truncated teardrop shape for aerodynamic efficiency is provided. The helmet design incorporates three ridges centered across the upper front portion of the helmet causing airflow over the helmet to separate from the rear surface of the helmet prior to the onset of turbulence resulting in minimized buffeting of the helmet and reduced drag. A combination of buffeting and a unique retention strap adjustment clip result in greater stability of the helmet on a user's head.

Abstract: Support tables suitable for supporting a computer keyboard in front of a user and adapted for rotatable attachment to the side arms of a chair are provided. Each support table is hingedly attached to the front of each side arm so as to be pivotable about each of two orthogonal axes. The support tables are foldable from a generally horizontal position disposed above the seat of the chair and in front of the chair side arms and the user to a stored position disposed adjacent the outside sides the chair and side arms when the support tables are not in use.

Abstract: An audio system having a voice override and voice amplification control circuitry is provided. The system provides high quality music to a listener through a set of headphones and includes a microphone and a foot operated switch to allow a user to override the music signal to communicate with the listener. The foot switch initiates a ramp voltage signal generator which gradually attenuates the normal music signal to a predetermined level and gradually increases the level of the voice signal and mixes it with the music signal. When the voice signal terminates, the music gradually returns to its normal level when the foot switch is deactivated resetting the ramp voltage signal generator.

Abstract: The motion picture branching method is superseded by an animation method which enables rapid and repeated switching of multiple tracks of different camera-originated animation of the same character during continuous action in a scene, and enables branching at the termination of an action to multiple actions or scenes. This method is the basis of a double-circuit video system that enables a player to repeatedly touch or hit an animated character during a continuous action as displayed on a projection screen or television monitor and thus change the action repeatedly. Another system embodiment enables the player to swing a racket before the screen or television monitor, hit the mid-air projected image of a perspective ball animated action, return the ball back to the animated character opponent, and play a simulated game during the the player exercises the same skills used to play the game simulated.