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SDR-3X Sony Dream Robot 3X Country: Japan Manufacturer: Sony Year: 2000 Height: 1'8in (50.8cm) Weight: 16lbs (7kg) Degrees of Freedom: 24 Webpage Info

Sony reviled the SDR-3X in November of 2000 and the SDR-4X two years later in March of 2002. By synchronizing the movements of 24 joints on its body, the robots can perform basic movements such as walking and changing direction, as well as getting up, balancing on one leg, kicking a ball and dancing. The "brain" of the SDR builds "occupancy grids" of the visual environment similar to the systems of Hans Moravec.

To realize stable walking movement, the ZMP (Zero Movement Point) where the combined force of both the inertia and body weight meet, must be judged against whether balance is possible on the surface that is being walked upon. The SDR-3X uses two RISC processors for thinking and motion control. Information gathered from a CCD camera, microphone, posture sensors and touch sensors on the bottom of the feet is processed to synchronize movements of the body’s joints.

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