| 摘要 |
A radio pager having a frequency correcting function of the present invention includes an arithmetic section for determining, during an interval between the start and the end of a particular signal, a center amplitude based on the maximum and minimum values of the signal, producing a difference between the center amplitude and a reference voltage, and feeding back the resulting center voltage data to a quartz oscillation section or reference oscillation section. As a result, the oscillation frequency of the oscillation section is automatically corrected. This insures an accurate voltage amplitude and therefore accurate decision on a multilevel digital signal.
|
