A video game including a player operated device for controlling the velocity and direction of movement of a game object. The game player may generate a pulse train having a pulse repetition rate proportional to the desired velocity of the game object. A numerical value of the pulse rate as a function...http://www.google.de/patents/US4462594?utm_source=gb-gplus-sharePatent US4462594 - Video game with control of rate of movement of game objects
