| 摘要 |
An electrical apparatus for determining the fundamental frequency of a musical note wherein the apparatus comprises a plurality of means for generating and responding to pulse type signals. More particularly, first and second means responsive to an electrical representation of the musical note are provided for generating first and second pulse trains whose pulses corresponding to the maxima and minima, respectively, of the electrical representation. The aforesaid first pulse train is applied to a first input of a first logic circuit means whose second input is fed a further pulse train from the output of a second logic circuit means.
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