Abstract: A thermoregulated recreational garment includes a front pouch with side entry openings for warming or resting the hands therein during periods of inactivity, a front pocket located behind the front pouch, and two side ventilation openings. The two side ventilation openings are adapted for quick venting and cooling of the body, typically after periods of strenuous activity when a lot of body heat is built up inside the garment. The torso section also can include long sleeves with extended cuffs and thumb holes to allow the user to slide their thumbs therethrough so that the cuffs cover the user's wrists during cold weather outdoor activities. The front pocket is adapted to hold an audio device, and typically an opening such as a grommet or eyelet is fitted through the back wall of the front pocket to provide access for headphone wires.

Abstract: An electronic stethoscope having two listening heads, functionally equivalent to one another, each containing a microphone. The signal of one microphone is subtracted from the signal of the other microphone, and the resulting difference signal is amplified, using either analog or digital signal processing techniques. The amplified difference signal is transduced to sound by headphones. Sounds which originate in the plane equidistant from both microphones (the “midplane”) are eliminated altogether, a fact which may be exploited to dissect a composite sound into two component sounds. Other sounds are attenuated in a predictable pattern, producing a focusing effect which increases as the microphones are brought closer together. The stethoscope incorporates features which minimize electromagnetic interference, enhance low-frequency throughput, reject amplified Johnson noise, and conserve battery power.