Patent Document ID: 20150048242
Application ID: 14469753
Patent Flag: 0

Claim One:
1. Apparatus for estimating phase by processing sensor signals from a set of sensors, the sensor signals collectively conveying a sensed phase for a periodically varying state of an object, the sensed phase including an error component due to non-ideal arrangement or performance of the sensors, comprising: a phase estimation processor operative to (1) apply a first correlation calculation to simultaneously collected samples of the sensor signals to generate first quadrature values for the sensor signals as a set, the first correlation calculation employing variable calculation values, and (2) apply a phase calculation to the first quadrature values to generate an estimated phase indicative of the periodically varying state of the object; and a pre-quadrature calibration circuit operative to (1) apply respective second correlation calculations to respective sequences of samples of the sensor signals individually to generate respective sets of second quadrature values for each of the sensor signals, (2) apply phase and/or magnitude calculations to the sets of second quadrature values to generate the variable calculation values for the first correlation calculation and thereby compensate for the error component and improve accuracy of the estimated phase.