| 摘要 |
PURPOSE:To eliminate substantially the calling mistake of the data signal and also to delete a fault disabling the data reading action due to noises, by supplying the noise mixture data at the center of an eye pattern, thereby detecting the level and the polarity of said data mixture data through a CPU. CONSTITUTION:A PLL 5 controls 2-80 call channels, for example, and the received MSK wave is extracted out of the IF stage of a receiver. The high and low frequency noise components contained in the MSK wave are deleted when only the necessary frequency band is extracted by a band pass filter and undergo the waveform shaping through a comparator to be supplied to the input port PB of a CPU 4 as well as a line of an input port P3, for example. Then the noise components undergo the necessary processing within the CPU 4 and are delivered through two lines of a port P7 and a line of a port P8, for example, in the form of the processing data. Then the control signal is applied to the variable divider, etc. of a call channel control PLL. |
