| 摘要 |
<p>PURPOSE:To automatize the operation by respectively setting an oscillation central frequency to the frequency corresponding to a MUSE signal. CONSTITUTION:When a MUSE signal of a base band is inputted from a tuner 3, a lock deciding circuit 67 decides whether or not a first voltage control oscillator VCO 63 to be presently used based on a voltage signal in accordance with the phase dislocation quantity of the output of a phase error detecting circuit 61 is locked. When it is not locked, a selecting circuit 65 is switched so as to use one more second VCO 64 which is not used presently. Thus, based on the frequency signal from the output of a new VCO 64, a new clock signal is generated, the action such as A-D conversion is executed and the VCO 64 becomes a lock condition.</p> |
