A Direct-Reading Frequency Meter Suitable for High Speed Recording

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Abstract
A modified two‐tube thyratron inverter is employed to deliver an invariant current pulse to an indicating instrument each time the polarity of the input signal reverses. The average current in the indicator is strictly proportional to the frequency of the input signal below 7000 cycles and approximately so for higher frequencies. The current may be varied to permit a standard current instrument to be used as a direct‐reading frequency indicator. The readings of the instrument are independent of the amplitude or wave form of the input signal over a wide range. When the frequency of the input signal is not constant either an accurate indication of the average frequency can be obtained or the output circuit of the instrument can be modified to permit the frequency to be recorded as a function of time. The problem of recording the frequency variations occurring in speech or singing is discussed and other applications of the instrument are suggested.

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