Broadcast signal receiving apparatus and method of filtering noise signals
AssigneeSamsung Electronics Co., Ltd.
InventorYoung-jin Lee
Life of this patent
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Abstract
Broadcast signal-receiving apparatus and a method filtering noise signals. The broadcast signal-receiving apparatus includes a tuner to convert an RF signal to a lower frequency signal to output an intermediate frequency (IF) signal, a filter to filter the IF signal to output a digital IF signal, and a controller to control the tuner to shift a frequency of the IF signal to a frequency band to remove the noise signals if the digital IF signal contains noise signals of a predetermined magnitude. Accordingly, the broadcast signal-receiving apparatus can filter the noise signals resulting from analog and digital broadcast signals adjacent to a digital broadcast signal on a channel selected for viewing.
Claims29
A broadcast signal-receiving apparatus to receive and process analog and digital broadcast signals of a radio frequency (RF) signal format, comprising:
- a tuner to convert an RF signal to a lower frequency signal to output an intermediate frequency (IF) signal;
- a filter to filter the IF signal to output a digital IF signal;
- and
- a controller to control the tuner to shift a frequency of the IF signal to a frequency band that is suitable to remove noise signals with the filter when noise signals of a predetermined magnitude are contained in the digital IF signal,
- wherein the controller determines whether there are noise signals by using a bit error rate.
A broadcast receiving apparatus, comprising:
- a tuner to receive an RF signal including one or more channels, and having a mixing unit to mix a frequency of a selected channel with a predetermined adjustable frequency such that the frequency of the selected channel is converted to a predetermined portion of a filter band,
- wherein the mixing unit converts the frequency of the selected channel to the predetermined portion of the filter band by shifting a center frequency of the selected channel to a predetermined IF frequency, determines whether noise from an adjacent channel falls substantially outside the filter band, and re-shifts the center frequency of the selected channel closer to an end portion of the filter band when the noise from the adjacent channel does not fall substantially outside the filter band, and
- wherein the mixing unit determines whether noise falls substantially outside the filter band by using a bit error rate.
A noise signal-filtering method usable in broadcast signal-receiving apparatus to receive and process analog and digital broadcast signal of a radio frequency signal format, the method comprising:
- converting a frequency of an RF signal received on a selected first channel to a lower frequency to output an intermediate frequency (IF) signal if there is an adjacent channel on one side of the first channel;
- filtering the IF signal to output a digital IF signal;
- and
- shifting a frequency of the IF signal to a frequency band suitable to remove noise signals in the filtering operation if the digital IF signal is determined to contain noise signals of a predetermined magnitude,
- wherein it is determined whether there is an adjacent channel by using a bit error rate.
A method of filtering noise from a broadcast signal, the method comprising:
- receiving an RF signal including one or more channels;
- determining whether there is a channel adjacent to a channel selected from the one or more channels by using a bit error rate;
- converting the RF signal to an IF signal of a predetermined frequency;
- displaying a signal received on the selected channel included in the IF signal, when there is no adjacent channel or when there are adjacent channels on each side of the selected channel;
- and
- processing the selected channel to eliminate noise from an adjacent channel by shifting a frequency of the IF signal from the predetermined frequency such that the selected channel corresponds to a boundary of a predetermined filter band and a frequency of the adjacent channel fails outside the boundary of the predetermined filter band, when there is one channel adjacent to the selected channel.
A method of filtering noise in broadcast signals, the method comprising:
- converting a frequency of a received signal containing one or more channels to a predetermined frequency in a filter band;
- determining whether noise from an adjacent channel interferes with a signal of a selected channel that is passed by the filter band by using a bit error rate;
- and
- shifting the converted frequency of the received signal in the filter band when noise from the adjacent channel interferes with the signal of the selected channel.
Dependencies are inferred from the claim text.