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Why does the frequency fluctuate periodicaly in the chart?

Posted 6 years ago by mribi

The main periodic fluctuation of the frequency in the chart is mainly caused by the excentricity of the record. The cycle time for this type of fluctuation is 1.8s for 33.3 RPM and 1.33s for 45 RPM. This type of fluctuation could be filtered using a sharp notch filter, which on the other hand would cause loosing ‘real’ fluctuation in the filtered band too.

Posted in: Common

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