| 摘要 |
PURPOSE:To set a circuit scale to be small and to correctly detect a pilot signal and its C/N. CONSTITUTION:A pilot signal detection part 31 receives the pilot signal, A phase comparator 31c compares the pilot signal with a control signal so as to generate a phase error signal. A voltage control oscillator 31d controls the phase of the control signal based on the phase error signal. When a phase error shown by the phase error signal is zero, a phase synchronism comparator 31f outputs a pilot signal detection signal. Furthermore, the phase error signal is given to a noise detection art 32 and the ratio of the signal to noise corresponding to the phase error signal is detected. Since detection is executed by using the phase error signal and the pilot signal and C/N are substantially detected by one system, the circuit scale can be miniaturized. Furthermore, mutual interference between a frequency error and noise can be removed and the pilot signal and C/N can be detected. |
