| 摘要 |
<p>A detecting circuit (5), a control circuit (9) and a memory circuit (10) are supplied with power, while a high frequency amplifying circuit (4) and a baseband demodulating circuit (8) are not supplied with power. Based on a power conversion table prepared and stored in the memory circuit (10), the control circuit (9) detects, from an RSSI signal detected by the detecting circuit (5), a reception power at an antenna (1). The control circuit (9) determines whether the reception power at the antenna terminal is greater than a threshold value (e.g., -80dBm). If so, the control circuit (9) judges that the broadcast signal is receivable. If so, supplying power for the high frequency amplifying circuit (4) and baseband demodulating circuit (8) is initiated to enter a normal broadcast signal reception operation.</p> |
