| 摘要 |
PURPOSE:To extract stably an SC signal and to attain demodulation by incorporating a loop to a service channel (SC) signal into one and increasing the loop gain of a PLL. CONSTITUTION:The orthogonal center tap of the Ich and Qch of a transversal filer is, e.g., eliminated to incorporate the loop to the SC signal into one and the SC signal is extracted from the PLL loop. Further, the PLL loop gain is increased to compensate the function by the loop of the orthogonal tap so as to avoid hindrance to the demodulation. In addition to the elimination above, the loop gain including, e.g., the orthogonal center tap is decreased or the frequency characteristic of the loop is set so as not to be overlapped with the frequency band of the SC signal.
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