インパルス周波数表示の簡便法

概要

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A device for on-line display of the instantaneous frequency of nerve impulses is reported here. It consists of four units, which are Schmitt trigger circuit, differentiator, trigger circuit and frequencygram unit. The nerve impulses at various intervals trigger the Schmitt trigger circuit, producing rectangular pulses. Then, these pulses are fed to the differentiator, by which a set of positive and negative pulses corresponding to leading and trailing edge in each rectangular pulse, respectively, are generated. The positive pulses are to brighten the oscilloscope trace, and the negative pulses to trigger the frequencygram unit via the trigger circuit. In the frequencygram unit, a capacitor with appropriate resistor in series (time constant; 20-60 msec) is connected to voltage source of three volts and the electronic switch (transistor) with normally open operation is connected across the capacitor. Each negative pulse is fed to the electronic switch so that the capacitor is rapidly discharged, and then is allowed to start charging after the negative pulse. The voltage across the capacitor is displayed as a vertical deflection on the oscilloscope, the trace of which is blacked out except for the duration of the positive pulse. The result is a series of bright spots on the screen, the height of each spot above the base line being inversely proportional to the preceding impulse interval.
社団法人日本動物学会の論文
1970-07-15