Abstract:
A pointing and control device for a computer system includes: a body (9) that can be manoeuvred by a user; and an inertial sensor (12), fixed to the body (9), for supplying first signals (S AX ', S AY ', S AZ ') correlated to the orientation of the body (9) with respect to a gravitational field ( G ) acting on the inertial sensor (12). The device moreover includes: a magnetometer (11), fixed to the body (9) for supplying second signals (S MX ', S MY ', S MZ ') correlated to the orientation of the body (9) with respect to the Earth's magnetic field ( M ) acting on the magnetometer (11); and processing modules (17, 18; 317) for determining an orientation (A, X', Y', Z') of the body (9) in an absolute reference system (X, Y, Z; G , P, N), fixed with respect to the Earth's magnetic field ( M ) and gravitational field ( G ), on the basis of the first signals (S AX ', S AY , S AZ ') and second signals (S MX ', S MY ', S MZ ').
Abstract:
A noise compensating device in a discrete time control system, for a R/W system for hard disks, including: a control loop (21-24) generating a first timing signal (T 1 ), a signal indicative of a quantity to be controlled (S POS ), and a control signal (S CONTR ), which have a first frequency (F 1 ) ; and an open loop control line (27) which generates a compensation signal (S COMP ) synchronous with the control signal (S CONTR ) and includes a sensor (17). The sensor includes a sensing element (30), generating an analog signal (V M ), an acquisition stage (31), connected to the sensing element (30) and generating a disturbance measure signal (S ACC ) correlated to the analog signal (V M ) and synchronous with the control signal (S CONTR ), and a synchronization stage (32). The synchronization stage (32) includes a frequency generator (42) having an input receiving the first timing signal (T 1 ) and a first and a second output (42b, 42c) connected to the acquisition stage (31) and generating, respectively, a second timing signal (T 2 ) and a third timing signal (T 3 ).
Abstract:
A pointing and control device for a computer system includes: a body (9) that can be manoeuvred by a user; and an inertial sensor (12), fixed to the body (9), for supplying first signals (S AX ', S AY ', S AZ ') correlated to the orientation of the body (9) with respect to a gravitational field ( G ) acting on the inertial sensor (12). The device moreover includes: a magnetometer (11), fixed to the body (9) for supplying second signals (S MX ', S HY ', S HZ ') correlated to the orientation of the body (9) with respect to the Earth's magnetic field ( M ) acting on the magnetometer (11); and processing modules (17, 18; 317) for determining an orientation (A, X', Y', Z') of the body (9) in an absolute reference system (X, Y, Z; G , P, N), fixed with respect to the Earth's magnetic field ( M ) and gravitational field ( G ), on the basis of the first signals (S AX ', S AY , S AZ ') and second signals (S MX ', S MY ', S MZ ').
Abstract:
A user controlled device (1) movable into a plurality of positions of a three-dimensional space and sending control signals correlated to the detected positions to an electrical appliance (25), in particular a mouse (1) for a computer system, wherein a MEMS acceleration sensor (20) detects 3D movements of the user controlled device. A microcontroller (22) processes the output signals of the MEMS acceleration sensor to generate the control signals, such as screen pointer position signals and "clicking" functions.