| http://www.w3.org/ns/prov#value | - Frequency-to-voltage converter 56 emits a signal such as is shown in FIG. 6B. Again, the pulses are triggered upon every positive zero crossing of the signal of FIG. 6A. Thus, low pass filter 60 integrates the pulses of FIG. 6B to create the stepped pulses of FIG. 6C. These pulses of varying amplitude are the derived voltages proportional to the frequency content of the signal of FIG. 6A. This rev
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