| 摘要 |
<p>The call timing method compares the summation of pulses in a store with those summated by a counter and upon agreement, forwards a charging pulse to the appropriate accounting equipment. The counter is then restored to zero and starts the next time period summation. Time period, i.e charge rate, changes for different periods of the day and different times of the year are accommodated by the equipment. The equipment comprises a counter (Z in UZ1) to feed timing pulses from a master clock (ZE) to a comparator (Vg) so that the output can be controlled by the store (Sp1) containing the information relating to date and time of day changes for different charging periods. There is also a back up store and counter (Sp2,UZ2). An address signal is sent out from the above control store (Sp1,UZ1) into a switching circuit (Ta1...Tan) which contains as many switches as are tariff changes in the charging structure. The output switched stage (Ta1...Tan) then accesses the correct tariff charging pulse periodicity section from the store (Sp3) containing all the required periodicities.</p> |
