Disclosed are pyrazole compounds of general formula, wherein R, R1, Rc, Rd, Re, Rf, X, Y, Z, A and B are as defined in the application. The active piezoelectric element causes the resonator to vibrate and detects the frequency of the vibration. This estimate undergoes a high-pass filtering process of a zero phase error characteristic by the filter unit to remove the vibration component of low frequency band and to thereby obtain a synchronous vibration learned value with high precision.