| 摘要 |
<p>The invention relates to a digital broadcast receiver capable of receiving digitally modulation television (TV) signals comprising: a first frequency converter (40,130,70,160) adapted to convert a received digitally modulated television signal into an intermediate frequency signal being in a transmission band lower than the received digitally modulated TV signal and having a frequency substantially identical to that of standard TV signals; a band-pass filter (80) for selectively pass-through of the intermediate frequency signal from the intermediate frequency converter while eliminating disturbance from its neighboring signals; a phase-lock loop (PLL) circuit (140,170) for controlling an oscillation frequency of a local oscillator (130,160) in said first frequency converter by comparing the oscillation frequency to an oscillation signal of a reference oscillator (150,180); a second frequency converter (100,190) adapted to convert the first intermediate frequency signal passed through said band-pass filter into a second intermediate frequency signal lower in frequency than said first intermediate frequency signal and a digital demodulator (290) adapted to demodulate the second intermediate frequency signal as converted by said second frequency converter. <IMAGE></p> |
