Patent ID: 7162397
Filing Date: 2007-01-09
Classification: G01L

Abstract:
1. A signal processing system for angle demodulating a ripple signal obtained from an alternator output signal, the system comprising: an analog-to-digital converter configured to sample the ripple signal to generate a diode ripple data stream; a bandpass filter configured to receive the diode ripple data stream and further configured to filter the diode ripple data stream to generate a complex diode tone; an angle demodulator configured to generate a phase demodulated signal by receiving the complex diode tone and demodulating the complex diode tone; a slew rate limiter configured to receive the diode ripple data stream and to apply a slew rate limit to identify an impulse in the diode ripple data stream, the slew rate limiter further configured to reduce the impulse magnitude before the bandpass filter processes the diode ripple data stream; and a spectrum analyzer operatively coupled to the band pass filter and configured to determine a center frequency for the band pass filter.