Abstract: Although video display screens are factory calibrated to correct performance, they differ in the actual color balance presented to the viewer. Similarly, the output of video sources may vary, in particular from video cameras. For recalibration purposes, each video display screen is connected to the video source via a Central Processing Device, and each video display screen is calibrated when first installed by means of a test signal having a pre-defined color balance. The signal is analyzed by means of a three-color sensor, and the information is fed back to the Central Processing Device and stored along with a device identifier. Any subsequent video signal provided to a particular video display screen will be modified electronically by means of individual stored parameters. Video sources will have their output signals similarly modified after having been subjected to a similar analysis performed on a video display screen already calibrated.

Abstract: Traditional cuffs for measuring blood pressure use an air chamber enclosed in a non-stretchable fabric to occlude an artery in a limb when supplied with pressurised air. A stethoscope used on the limb is used to monitor blood flow. Application of the cuff is inconvenient and correct placement of the stethoscope chestpiece requires skill. According to the invention blood pressure measurement is facilitated by having the air chamber enclosed in a pre-formed shell-like structure being flexible around the limb and stiff along the limb and by using a linear array of microphones to detect the blood flow noises, the best signal from one of the microphones being automatically selected. Furthermore, the invention provides a facility for correcting the reading in dependence of the amount of wrap of the limb.

Abstract: Traditional cuffs for measuring blood pressure use an air chamber enclosed in a non-stretchable fabric to occlude an artery in a limb when supplied with pressurised air. A stethoscope used on the limb is used to monitor blood flow. Application of the cuff is inconvenient and correct placement of the stethoscope chestpiece requires skill. According to the invention blood pressure measurement is facilitated by having the air chamber enclosed in a pre-formed shell-like structure being flexible around the limb and stiff along the limb and by using a linear array of microphones to detect the blood flow noises, the best signal from one of the microphones being automatically selected. Furthermore, the invention provides a facility for correcting the reading in dependence of the amount of wrap of the limb.