| 摘要 |
Numbers representing time periods are stored in a plurality of shift registers, each register being associated with a digit of the stored number. Each shift register has a plurality of stages, equal in number to the number of time periods which are served by the counter. The number derived from the output of the shift register is recirculated to the input through an adder, the number count being thereby increased to correspond to elapsed time. The number count is increased, however, only during every nth recirculation to reduce the magnitude of the number which defines an elapsed time period thereby reducing the number of shift registers required.
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