Patent ID: 8638225
Filing Date: 2014-01-28
Classification: G07C

Abstract:
1. A circuit device configured to monitor a sensor device, the sensor device being configured to measure a predetermined physical parameter and provide a sensor output signal corresponding to the predetermined physical parameter, the circuit device comprising: a sampling circuit configured to sample the sensor output signal at a predetermined sampling rate to thereby obtain a predetermined number (N) of sensor output signal samples, N being an integer value; an analog multiplication circuit coupled to the sampling circuit, the multiplication circuit being selectably reconfigurable to generate any one of a plurality of predetermined digital sequences, each predetermined digital sequence of the plurality of predetermined digital sequences including a sequence of N coefficients, the multiplication circuit being configured to multiply each sensor output signal sample by a corresponding coefficient in a selected predetermined digital sequence to thereby generate a sequence of N multiplication products; and an analog integrator circuit coupled to the analog multiplication circuit, the analog integrator circuit being configured to add the N multiplication products to generate an analog signal power estimation value, the analog signal power estimation value corresponding to a degree of correlation between the sensor output signal and the selected predetermined digital sequence.