Abstract: A device for inducing a pre-hypnotic state of profound relaxation in an individual is disclosed wherein the individual's mind is receptive to suggestion. The device is characterized in that biofeedback signals from the individual are used to produce a plurality of pulsed physical stimuli having a frequency of twice that of the heartbeat rate of the individual. The device includes a heartbeat sensor for producing a first pulse signal, the pulses of which correspond with the heartbeat of the individual. An interpolation device is connected with the heartbeat sensor to produce a second pulse signal, the pulses of which occur midway in time between successive pairs of heartbeat pulses, respectively.

Abstract: A loudspeaker enclosure is disclosed which includes a horizontal bottom wall, parallel spaced vertical front and rear walls connected with the bottom wall, the front wall containing an opening for receiving a loudspeaker, and a horizontal top wall connected with the upper edges of the front and rear walls. The invention is characterized by the provision of vertical baffle walls which define a converging compression chamber behind the loudspeaker opening in the front wall, and a pair of exponential folded horns arranged laterally on opposite sides of the compression chamber. Each of the baffle walls between the compression chamber and the folded horns contains at least one opening adjacent its forward edge, each of the openings having a generally trapezoidal vertical cross-section, the vertical dimension of the front portion of the opening being greater than the vertical dimension of the rear portion of the opening.

Abstract: An anthropomorphic programmable joint joins two limb portions. The joint may simulate the knee joint and the portions may correspond to the upper and lower leg portions about the knee. A magnetic particle brake is attached to the upper portion with a shaft that carries the pinion gear of a bevel gear set located at the joint. The ring gear of the bevel gear set is fixed to the lower limb portion so that rotation of the lower limb portion about the joint causes the shaft to rotate the magnetic brake fixed to the upper portion. The brake resistance to this rotation, and therefore the resistance of the joint to rotation, may be programmed in correspondence to electrical current applied to the brake.