Patent ID: 6909470

Claim:
A digital broadcast receiver capable of receiving digitally modulated television signals in which plurality of channels are multiplexed, said receiver comprising: a receiver unit which receives a data-compressed and digitally modulated television signal, the bandwidth of said television signal being equal to that of NTSC system; a first frequency converter which converts a received digitally modulated television signal into a first intermediate frequency signal having a frequency lower than that of the received television signal, said first intermediate frequency signal having a frequency used in demodulating a signal in NTSC system; a band-pass filter coupled to the first frequency converter, which selectively passes through the first intermediate frequency signal; a phase-lock loop (PLL) circuit coupled to the first frequency converter, which controls an oscillation frequency of a local oscillator in said first frequency converter; a second frequency converter coupled to the band-pass filter, which converts 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; a digital demodulator coupled to the second frequency converter, which demodulates the second intermediate frequency signal which is converted by said second frequency converter; a data decompressed which expands the demodulated signal, wherein the second intermediate frequency signal has a frequency which is almost coincident with a symbol rate of the digitally modulated television signal.