| 摘要 |
<p>PURPOSE: To minimize influence by noise and to form an integrated circuit by generating a signal having the same frequency as a receiving radio frequency (RF signal), mixing the signal with the received RF signal and outputting a baseband signal. CONSTITUTION: A broadcasting signal receiving device is provided with a PLL 130 for varying a specific frequency of a signal and outputting it, a receiving circuit 100 for respectively turning it with broadcasting RF signal of a specific channel which is mutually different according to the output signal of the PLL, and an output circuit 200 for mixing the output signal Vo (t) of a frequency oscillating part 230 for generating a signal having the same frequency and phase as the frequency and phase of that output signal Vc (t) with the output signal Vc (t) of the receiving circuit (211) and directly outputting a baseband signal. Thus, the problem of image frequency which is apt to be caused in a conventional technique is eliminated. A special demodulator is not necessitated.</p> |
