Only two pictures found so far, assumed to be from ROBODEX 2000. No other information known.
Sony announced SDR-3X on November 21st, 2000. The 50 cm tall biped features a total of 24 degrees of freedom: 2 in the head, 2 in the torso, 4 per arm, and 6 per leg. Sony developed three different sized (ISA) Intelligent Servo Actuators which are a combination of motor, gearhead, and control circuitry. SDR-3X uses ZMP (zero moment point) to walk at up to rates of 15 meters per second. The robot also has two microphones that allow it to recognize up to 20 predefined words. SDR-3X also has a CCD camera module that it can use to track areas of color such as a pink ball.
Sony unveiled SDR-4X on the 19th of March 2002 and presented it at ROBODEX 2002. The robot has been aesthetically completely redesigned compared to the previous versions.
https://www.youtube.com/watch?v=ofD1ypvFeWM
The robot features two CCD cameras for eyes, infrared distance sensors on the head and feet, 7 microphones, and a speaker for audio output. SDR-4X has a total of 38 degrees of freedom: 4 in the neck, 2 in the torso, 5 per arm, 6 per leg, and 1 per finger. Compared to the actuators in SDR-3X, the ISA’s in SDR-4X have “approximately 30% improvement in the start-up torque, an approximately 15% improvement in rated torque, and an approximately 20% improvement in efficiency.” SDR-4X can walk at 20 meters per second on smooth ground, 6 meters per second on irregular ground, and walk up and down a slope of up to 10 degrees. SDR-4X has the ability to memorize 10 faces and recognize people by their voice tone. SDR Motion Creator allows for keyframing the arms and head joints for animation, and automatically calculates the leg and torso positions to keep the robot balanced.
