| 摘要 |
PURPOSE: To filter an input signal by allowing the input signal to pass through a filter having adjustable pass band center frequency, and adjusting the pass band center frequency in respond to a frequency control signal generated by demodulating the input signal. CONSTITUTION: An input signal from a crystal angular speed sensor or the like is inputted through an A/D converter 141 and an adaptive Co canceler 144 to a tracking filter 143. A synchronizing filter 163 in the filter 143 is provided with adjustable pass band frequencies, and an output signal V3 filter- processed in response to the input signal is generated. A discriminator 164 generates base band center frequency control signals β1 and a pass band width control signal α1 in response to a synchronizing reference signal IREF and a rectangular reference signal QREF generated by a Hilbert converter from the signal V3 , and controls the pass band center frequency and pass band width of the filter 163. |
