| 摘要 |
A sphere which may be rotationally displaced by manual action, protruding from a control panel, is mechanically connected for resolving its rotary motion into motions about two axes perpendicular to each other, for control of the direction and speed operation of a video recorder and playback equipment. When any of several particular rotary displacements of the sphere have taken place, a controllable brake system bears on the mechanical coupling between the sphere and at least one of in the electronic transducers to exert a brake torque to simulate an index position. One such position is a neutral setting or "rest position". The y axis is used for gradual speed change and the x axis is used for stepwise speed change. The axis for gradual speed change has an initial threshold on each side of the rest position to determine direction. On the other axis, the speed steps may be separate for each direction, respectively on opposite sides of the rest position.
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