| 摘要 |
<p>A device for the measurement of the number of cycles or half-cycles of a tone by counting the cycles during a reference time which is proportional to the cycle time of the tone to be measured, comprising a store for the cycle times, a comparator, a subtraction device in which a constant value is subtracted from the counted number of tone cycles, decoders, displaying devices for the oscillation error and the polarity sign, a retriggerable mono-flop for the oscillation existence signal, a flip-flop for a wait signal, a mono-flop for a read signal and logic elements for enabling the oscillation counter and the reference pulse counter.</p> |
