| 摘要 |
PURPOSE: To decide a phase angle difference with high precision and decide a frequency difference and a frequency accurately and continuously at arbitrary timings without depending upon sampling timings. CONSTITUTION: The product calculation of the values of sampling data 2 is performed in a process 1. The outputs of the calculation process 1 are inputted to n-step digital filters 2, 3,... to reduce the gain near a second harmonics and perform the suppression of errors. |
