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US RE37,326 E1Granted
HDTV receiver
AssigneeLG Electronics Inc.
InventorDae Jin Kim
Life of this patent
Estimating the term…
Abstract
An HDTV receiver is disclosed including a tuning portion for selecting one of a plurality of RF signals received, and converting a selected RF signal into an intermediate frequency signal; a demodulator/FPLL for demodulating the intermediate frequency signal output from the tuning portion into a baseband signal in which the frequency and phase are locked, and outputting an AFC signal; a first local oscillator for forming a frequency signal which can be varied from a reference frequency to a specific frequency, and outputting the thus-formed frequency signal to the demodulator/FPLL; and a VSB filter for VSB-filtering the baseband signal output from the demodulator/FPLL.
Claims51
An HDTV receiver comprising:
- a tuning portion for selecting one of a plurality of RF signals received, and converting a selected RF signal into an intermediate frequency signal;
- a demodulator/FPLL for demodulating said intermediate frequency signal output from said tuning portion into a baseband signal in which the frequency and phase are locked, and outputting an AFC signal;
- a first local oscillator receiving said AFC signal and forming a frequency signal which can be varied from a reference frequency to a specific frequency, and outputting the thus-formed frequency signal to said demodulator/FPLL;
- and
- a VSB filter for VSB-filtering said baseband signal output from said demodulator/FPLL.
2 more elements
A digital television receiver comprising:
- a tuning portion, including
- a fixed local oscillator providing a fixed frequency signal, and
- a tuner receiving a channel tuning signal and the fixed frequency signal and in response thereto selecting one of a plurality of RF signals received, and converting a selected RF signal into an intermediate frequency signal;
- a demodulator/FPLL for demodulating said intermediate frequency signal output from said tuning portion into a baseband signal in which the frequency and phase are locked, and outputting an AFC signal;
- and
- a variable local oscillator receiving said AFC signal and forming a frequency signal which can be varied from a reference frequency to a specific frequency, and outputting the thus-formed frequency signal to the demodulator/FPLL.
3 more elements
A VSB receiving system for a digital television comprising:
- a tuning portion including a tuner for selecting one of a plurality of signals received, and converting a selected signal into an intermediate frequency signal, the tuning portion including a fixed local oscillator providing a first fixed frequency signal to the tuner;
- a demodulator including an FPLL for demodulating said intermediate frequency signal output from said tuning portion into a baseband signal, the demodulator outputting an AFC signal;
- and
- a variable local oscillator receiving the AFC signal and providing a frequency signal that can be varied from a reference frequency to a specific frequency and outputting a second frequency signal to the demodulator.
1 more element
A VSB receiving system for a digital television comprising:
- a tuner selecting one of a plurality of signals received, and converting a selected signal into an intermediate frequency signal;
- a fixed local oscillator providing a first fixed frequency signal to the tuner;
- a filter receiving the intermediate frequency signal and performing a band pass filtering to produce a filtered signal;
- an amplifier amplifying the filtered signal;
- a demodulator including an FPLL for demodulating said filtered signal output from the amplifier and outputting an AFC signal;
- and
- a variable local oscillator receiving the AFC signal and providing a frequency signal that can be varied from a reference frequency to a specific frequency and outputting a second frequency signal to the demodulator,
- wherein the demodulator outputs a baseband signal.
5 more elements
A method of processing a transmitted digital television signal at a VSB receiving system for a digital television, the method comprising the steps of:
- selecting one of a plurality of signals received, and converting a selected signal into an intermediate frequency signal in response to a first fixed frequency signal generated from a fixed local oscillator;
- generating an AFC signal in response to the intermediate frequency signal;
- generating a second frequency signal that can be varied from a reference frequency to a specific frequency in response to the AFC signal;
- and
- demodulating the intermediate frequency signal and generating a baseband signal from the intermediate frequency signal in response to the step of generating the second frequency signal.
2 more elements
A method for processing a transmitted digital television signal at a VSB receiving system for a digital television, the method comprising the steps of:
- selecting through a tuner one of a plurality of signals received, and converting a selected signal into an intermediate frequency signal;
- generating through a first fixed local oscillator a first fixed frequency signal to the tuner;
- band pass filtering the intermediate frequency signal to produce a filtered signal;
- amplifying the filtered signal;
- demodulating the filtered signal output from the amplifier and generating an AFC signal;
- generating a frequency signal that can be varied from a reference frequency to a specific frequency and outputting a second frequency signal to the demodulator;
- and
- generating a baseband signal in response to the step of generating the frequency signal that can be varied.
5 more elements
A VSB receiving system for a digital television, comprising:
- a tuning portion including a tuner for selecting one of a plurality of signals received, and converting a selected signal into an intermediate frequency signal, the tuning portion including a local oscillator providing a fixed frequency signal to the tuner, and further including an intermediate frequency filter for filtering said intermediate frequency signal to produce a filtered intermediate frequency signal;
- a demodulator including an FPLL for demodulating said filtered intermediate frequency signal output from said tuning portion into a baseband signal, the demodulator outputting an AFC signal;
- and
- a variable local oscillator receiving the AFC signal and providing a second frequency signal that can be varied from a reference frequency to a specific frequency to the demodulator.
1 more element
A VSB receiving system for a digital television, comprising:
- a tuner selecting one of a plurality of signals received, and converting a selected signal into an intermediate frequency signal;
- a local oscillator providing a fixed frequency signal to the tuner;
- a SAW filter receiving the intermediate frequency signal and performing a band pass filtering to produce a filtered signal;
- an amplifier amplifying the filtered signal;
- a demodulator including an FPLL for demodulating said filtered signal output from the amplifier and outputting an AFC signal;
- and
- a variable local oscillator receiving the AFC signal and providing a frequency signal that can be varied from a reference frequency to a specific frequency and outputting a second frequency signal to the demodulator,
- wherein the demodulator outputs a baseband signal.
5 more elements
A method for processing a transmitted digital television signal at a VSB receiving system for a digital television, the method comprising the steps of:
- selecting one of a plurality of signals received, and converting a selected signal into an intermediate frequency signal in response to a fixed frequency signal generated from a local oscillator, the selecting step including band pass filtering the intermediate frequency signal;
- generating an AFC signal in response to the intermediate frequency signal;
- generating a frequency signal that can be varied from a reference frequency to a specific frequency in response to the AFC signal and generating a second frequency signal;
- and
- demodulating the intermediate frequency signal and generating a baseband signal from the intermediate frequency signal in response to the step of generating the frequency signal.
2 more elements
A method for processing a transmitted digital television signal at a VSB receiving system for a digital television, the method comprising the steps of:
- selecting through a tuner one of a plurality of signals received, and converting a selected signal into an intermediate frequency signal;
- generating through a first local oscillator a fixed frequency signal to the tuner;
- saw filtering the intermediate frequency signal to produce a filtered signal;
- amplifying the filtered signal;
- demodulating the filtered signal output from the amplifier and generating an AFC signal;
- generating a second frequency signal that can be varied from a reference frequency to a specific frequency and outputting the second frequency signal to the demodulator;
- and
- generating a baseband signal in response to the step of generating the frequency signal that can be varied.
5 more elements
A VSB receiving system for a digital television, comprising:
- a tuning portion including a tuner for selecting one of a plurality of signals received, and converting a selected signal into an intermediate frequency signal, the tuning portion including a local oscillator providing a first frequency signal to the tuner;
- a first bandpass filter coupled to the tuner for receiving the intermediate frequency signal and outputting a bandpass filtered signal;
- a second filter coupled to the first bandpass filter, the second filter including a VSB signal matching filter.
A VSB receiving system for a digital television receiver comprising:
- a tuning portion including a tuner for selecting one of a plurality of signals received, and converting a selected signal into an intermediate frequency signal, the tuning portion including a local oscillator providing a first frequency signal to the tuner;
- a first bandpass filter coupled to the tuner for receiving the intermediate frequency signal and outputting a bandpass filtered signal;
- a demodulator coupled to the first bandpass filter and producing a baseband signal from the bandpass filtered signal;
- and
- a second bandpass filter coupled to the demodulator, the second bandpass filter including a VSB signal matching filter.
2 more elements
A VSB receiving system for a digital television comprising:
- a tuning portion including a tuner for selecting one of a plurality of signals received, and converting a selected signal into an intermediate frequency signal;
- a filter having a guard band value (α), receiving the intermediate frequency from the tuner and performing a bandpass filtering to produce a filtered intermediate frequency signal;
- a demodulator including an FPLL for demodulating said filtered intermediate frequency signal output from said filter into a baseband signal, the demodulator outputting an AFC signal;
- and
- a variable local oscillator receiving the AFC signal and generating a frequency signal that can be varied from a reference frequency to a specific frequency corresponding to the guard band value (α) and outputting said frequency signal to the demodulator.
2 more elements
A VSB receiving system for a digital television comprising:
- a tuner selecting one of a plurality of signals received, and converting a selected signal into an intermediate frequency signal;
- a filter having guard band value (α), receiving the intermediate frequency signal and performing a band pass filtering to produce a filtered intermediate frequency signal;
- an amplifier amplifying the filtered intermediate frequency signal;
- a demodulator including an FPLL for demodulating the filtered intermediate frequency signal output from the amplifier and outputting an AFC signal;
- and
- a variable local oscillator receiving the AFC signal and generating a frequency signal that can be varied from a reference frequency to a specific frequency corresponding to the guard band value (α) and outputting said frequency signal to the demodulator.
3 more elements
A method for processing a transmitted digital television signal in a VSB receiving system for a digital television, the method comprising:
- selecting one of a plurality of signals received, and converting a selected signal into an intermediate frequency signal;
- band pass filtering the intermediate frequency signal with a filter having a guard band value (α) and producing a filtered intermediate frequency signal;
- generating an AFC signal in response to the filtered intermediate frequency signal;
- generating a frequency signal that can be varied from a reference frequency to a specific frequency corresponding to the guard band value (α) in response to the AFC signal;
- and
- demodulating the filtered intermediate frequency signal and generating a baseband signal from the filtered intermediate frequency signal in response to the step of generating the frequency signal.
3 more elements
A method for processing a transmitted digital television signal in a VSB receiving system for a digital television, the method comprising:
- selecting through a tuner one of a plurality of signals received, and converting a selected signal into an intermediate frequency signal;
- band pass filtering the intermediate frequency signal with a filter having guard band value (α), and producing a filtered intermediate frequency signal;
- amplifying the filtered intermediate frequency signal;
- demodulating the filtered intermediate frequency signal output from the amplifier and generating an AFC signal;
- generating a frequency signal that can be varied from a reference frequency to a specific frequency corresponding to the guard band value (α) and outputting said frequency signal to the demodulator;
- and
- generating a baseband signal in response to the step of generating the frequency signal that can be varied.
4 more elements
A VSB receiving system for a digital television receiver comprising:
- a tuning portion including a tuner for selecting one of a plurality of signals received, and converting a selected signal into an intermediate frequency signal,
- a first band pass filter having a guard band value (α) coupled to the tuner for receiving the intermediate frequency signal and outputting a bandpass filtered signal;
- a demodulator coupled to the first band pass filter and producing a baseband signal from the bandpass filtered signal and;
- a variable local oscillator receiving the AFC signal and generating a frequency signal that can be varied from a reference frequency to a specific frequency corresponding to guard band value (α) and outputting said frequency signal to the demodulator and;
- a second band pass filter coupled to the demodulator, the second band pass filter including a signal matching filter.
2 more elements
Dependencies are inferred from the claim text.