Present a method for frequency measurement based on digital signal processor（ DSP） for measuring frequency of rotor blades in fiber turbine flow meter. On the basis of brief analysis on working principle of the fiber flow meter

design hardware circuitry platform of measurement system software; describe design method of high precision data acquisition by using general purpose timer of event manager and DSP implementation; analyze high stability

real-time FIR filtering algorithm and DSP implementation; discuss implementation of improving FFT algorithm by using the interpolation method to achieve high-precision frequency measurement; generate pulse width modulation（ PWM） wave using compare operation of general purpose timer and achieve TTL electric level output.