Abstract: A system for simulating changes in the resistance of a living body includes an output interface circuit including a variable resistance adapted to smoothly and naturally simulate the resistance of a living body. A generator circuit includes a microprocessor under the control of software to play back digitally recorded data representative of patterns of changing resistance. The software includes a user selection feature permitting various patterns to be played back in a way that simulates changes in the resistance of living body useful for learning about the patterns.

Abstract: A lavalier microphone assembly wherein ambient and mechanical interference are minimized. The assembly comprises a lavalier microphone. The microphone includes a microphone casing having an aperture for the entry of sound waves and a transducer disposed within the casing near the aperture for conversion of sound waves into electrical signals. The assembly also comprises a cable, which is connected to the transducer for transmitting the electrical signals to a remote location for processing. The assembly further comprises a microphone cage which is attached to the cable and which surrounds the microphone. By surrounding the microphone, the cage both prevents the microphone from being inadvertently contacted and spaces the microphone from noises produced by the rustling of clothing. The cage is mounted on an article of clothing by means of a mounting pin, the mounting pin being fixedly mounted on the cage.