KR20090080320A - apparatus for receiving a broadcast signal and method thereof - Google Patents

Abstract

A broadcasting signal reception apparatus and a broadcasting signal reception method are provided to enable a user to select a channel having big signal intensity and reduce setup time and channel conversion time. A channel is searched by using a received signal(S10). A channel list is generated by storing channel numbers including a first channel(S20). If a second channel in which the same service as the stored first channel is provided is searched, a channel having weak intensity among the first and second channels is identified(S30). The channel having weak intensity among the channels is deleted from a channel map or reallocated to an arbitrary channel number(S40).

Description

Apparatus for receiving a broadcast signal and method

The present invention relates to a broadcast signal receiving apparatus and a broadcast signal receiving method.

An apparatus capable of receiving a broadcast may generally perform a channel scan. For example, a broadcast signal receiving apparatus such as a set-top box, digital television, or mobile communication terminal that receives a broadcast receives a broadcast signal and obtains a channel of the broadcast signal. Can be. However, when the strength of the received broadcast signal is weak, the broadcast signal displayed on the broadcast signal receiving apparatus may be interrupted due to the weak signal. However, the broadcast signal receiving apparatus provides the user with all the channels obtained through the channel scan regardless of the received signal strength through the channel scan. Therefore, a user may select a broadcast received from a channel having a weak signal strength, and thus, a user may watch a broadcast having poor reception performance. In addition, when a broadcast signal having a weak signal strength is selected, not only broadcast display may be stopped but also power setup of the broadcast signal receiving apparatus may be delayed due to a channel scan operation. In addition, when the user selects a channel having a weak signal strength, there is a problem that the time of channel switching may be delayed.

SUMMARY OF THE INVENTION The present invention has been made in an effort to provide a broadcast signal receiving apparatus and a broadcast signal receiving method capable of providing a user with convenience in viewing a broadcast and selecting a channel.

Another problem to be solved by the present invention is to provide a broadcast signal receiving apparatus and a broadcast signal receiving method that enable a user to select a channel having a large signal strength and reduce a setup time or a channel switching time of the broadcast signal receiving apparatus.

In order to solve the above problems, the present invention is to search for a channel using the received signal and to generate a channel list by storing channel numbers including the first channel, the second service is provided with the same service as the stored first channel Identifying a channel received with a weak intensity among the first channel and the second channel when a channel is found, and generating a channel list storing the identified channel as an arbitrary channel number different from the channel number, or It provides a broadcast signal receiving method comprising the step of generating a channel list deleted from the list.

The identifying may set a flag on the channel received at the weak intensity. The identifying may assign a logical channel number of a channel received at the weak strength as a third value.

Whether the first channel and the second channel are channels that provide the same service may include a network identifier for identifying a network where a broadcast signal is generated, an identifier for identifying a physical channel, and a program or service. It may be determined whether the values of the identifiers are the same. Alternatively, whether the first channel and the second channel are the channels providing the same service may be determined by whether the logical channel numbers of the first channel and the second channel are the same.

In another aspect, the present invention provides a tuner for receiving a broadcast signal, searching for a channel of the received broadcast signal, a demodulator for demodulating a signal searched and tuned by the tuner, and a demultiplexer for demultiplexing a demodulated signal. A section information decoder for parsing section information output by the demultiplexer, a decoder for decoding the video or audio signal demultiplexed by the demultiplexer, and a control signal according to a user control command, and a channel searched by the tuner Store a list and if the tuner searches for a second channel that provides the same service as the first channel, the channel received at a weaker strength of the first channel and the second channel may be different from the original channel number of the channel. It provides a broadcast signal receiving apparatus including a control unit for storing as a channel or deleting the channel from the channel list. .

According to the disclosed broadcast signal receiving apparatus and broadcast signal receiving method, a user may be convenient in watching a broadcast and selecting a channel. In addition, the user can select a channel having a large signal strength, and the setup time or the channel switching time of the broadcast signal receiving apparatus can be reduced.

Hereinafter, embodiments of the present invention will be described with reference to the accompanying drawings.

1 is a diagram illustrating an example in which a broadcast signal receiving apparatus receives a signal. In general, the broadcast signal receiving apparatus includes a function of automatically searching for a channel when it is set up. This automatic channel search is called auto program or auto scan. When the broadcast signal receiving apparatus performs such a function, multiplexed information on a program or service among received broadcast signals, for example, a program association table (PAT), a program map table (PMT), a service description table (SDT), and a NIT ( It parses program information of PSI / PSIP (program specific information / program and system information protocol) such as service information (network information table) and the like (virtual channel table). The parsed information includes channel information capable of performing a channel search. The broadcast signal receiving apparatus stores the channel information in a memory and, when the user selects a channel, a packet ID (packet) of the video / audio stream of the selected channel. identifier). The broadcast signal receiving apparatus outputs a broadcast signal by filtering a set packet to decode a stream received from a desired channel.

However, as illustrated in FIG. 1, the apparatus for receiving broadcast signals may receive broadcast signals from broadcast transmitters that transmit two or more broadcast signals including different channels. As shown in the example of FIG. 1, when a broadcast signal receiving apparatus is adjacent to two broadcast transmitters, two or more channels having the same program / service content may be searched for in a broadcast signal received from a neighboring broadcast transmitter.

In this case, the channel having the same program / service content may mean, for example, a network identifier (original_network_id) for identifying a network in which the broadcast signal is generated and a physical channel, for a broadcast signal received from an area of another channel. A channel having the same identifier (transport_stream_id) and an identifier for identifying a program or a service (service_id) may be determined as a duplicate channel. That is, two or more channels including the same program / service content may be a duplicated channel or the same channel, although the physical frequency band to which the broadcast signal is transmitted is different or the logical channel number is different. In this case, the channel / duplicated program / service is not transmitted, but a channel having the same logical channel number among channels transmitted from different broadcast transmitters may exist.

Alternatively, even if original_network_id, transport_stream_id, and service_id are different, two or more channels having the same logical channel number obtained from the broadcast signal may be determined as a duplicate channel or the same channel. In this case, although the channel / duplicated program / service is not transmitted, a channel having the same original_network_id, transport_stream_id, and service_id values among channels transmitted from different broadcast transmitters may exist.

When the duplicate logical channel is stored in the broadcast signal receiving apparatus, two or more identical channel numbers may exist in the channel list searched and stored by the broadcast signal receiving apparatus. In this case, the stored memory of the broadcast signal receiving apparatus increases, which may slow down the setup time or channel switching speed when the broadcast signal receiving apparatus is initially set up.

As such, when two or more channels including the same program / service are searched from two or more adjacent transmitters, the performance of the broadcast signal receiving apparatus may be degraded.

The broadcast signal receiving apparatus may receive two or more broadcast signals including the same contents from two or more broadcast transmitters in adjacent regions, respectively, and store channel numbers in the received channels. The broadcast signal receiving apparatus may assign a channel number to each channel regardless of signal strength when storing channels having the same content among the received broadcast signals.

For example, it is assumed that the first channel among the channels included in the broadcast signal received from the first transmitter and the second channel among the channels included in the broadcast signal received from the second transmitter are the same channel. In such a case, the broadcast signal receiving apparatus first assigns a channel number corresponding to the original first channel to a first channel included in a broadcast signal having a low frequency (assuming a broadcast signal of a first transmitter including a first channel). In addition, a third channel number, not a channel number corresponding to the second channel, may be assigned to a second channel included in a broadcast signal having a large frequency (here, assumed to be a broadcast signal of a second transmitter including a second channel). Thus, even two identical channels may be stored under different channel numbers.

When the broadcast signal including the channel is received with the same contents, the first channel having the small physical frequency is stored first, but the first channel is stored as a channel number to be originally assigned to the first channel. Since the second channel having a large physical frequency is searched later during a channel scan, the second channel may not be stored as the same channel number as the first channel, and may be stored by assigning a channel number different from the original channel number.

However, in general, the signal strength of the broadcast signal including the first channel and the broadcast signal of the second channel is different. If the strength of the broadcast signal for the first channel among the broadcast signal for the first channel and the broadcast signal for the second channel in the example of FIG. 1 is small, the first channel number is stored as a channel number for identifying the original channel. However, the second channel is stored in the broadcast signal receiving apparatus with a channel number different from the channel number to be originally assigned to the second channel number even if the signal strength is large. Therefore, even if the first channel and the second channel have the same content, the user is likely to first select the first channel in the channel list because the first channel is stored with the original channel number. However, if the user selects a first channel having a weak signal strength among the first channel and the second channel having the same channel content, the screen may be interrupted and the program or service may not be normally received. On the other hand, the second channel having a large signal strength may not remember which channel number is stored, which is inconvenient for channel selection.

2 shows an example of a channel map showing the example described above. Referring to FIG. 2, when a broadcast of a duplicate channel is transmitted from an adjacent broadcast transmitter in the example of FIG. 1, the broadcast signal receiving apparatus manages a channel list as follows.

2 shows an example in which a transmitter transmits a broadcast signal in an ultra high frequency (UHF) band. As a result of searching for a channel by the broadcast signal receiving apparatus, it is assumed that channels 25, 30, and 50 are searched according to a frequency band in which a broadcast signal is transmitted among UHF bands.

It is assumed that a broadcast station allocates 1 and 2 as channel numbers of broadcast signals transmitted to UHF channel 25, and names of the channel numbers are channel 1 and channel 2, respectively. In addition, it is assumed that the strength of the broadcast signal received by UHF No. 25 by the broadcast signal receiving apparatus is 60.

Similarly, it is assumed that channel numbers 3, 4, and 5 are allocated to channel numbers of broadcast signals transmitted from the broadcast station to UHF channel 30, respectively, and the names of the assigned channel numbers are channel 3, channel 4, and channel 5. In addition, it is assumed that the strength of the broadcast signal received by the broadcast signal receiving apparatus at UHF 30 is 90.

The broadcast signal receiving apparatus may receive a signal from an adjacent broadcast transmitter.

If a broadcast signal is received from another broadcast transmitter in addition to the above-described broadcast signal, it is assumed that the channel number of the transmitted UHF band is 50. In the example of FIG. 2, the channel transmitted with the channel number of the UHF band at 50 is the same channel as the UHF channel 25 above. As such, the broadcast signal receiving apparatus may receive UHF channel 25 and UHF channel 50 having the same channel content in different physical frequency bands.

When the broadcast signal receiving apparatus receives the broadcast signal, the broadcast signal reception apparatus generates a channel map according to the channel number and stores the channel list. In the example of FIG. 2, the apparatus for receiving broadcast signals may store channels included in UHF channel 25 as channel numbers 1 and 2 and channels included in UHF channel 25 as channel numbers 3, 4 and 5, respectively, in the channel search order. have.

The channel numbers 1 and 2 included in the UHF channel 50 may be stored as different channel numbers because the channel numbers 1 and 2 are already stored in the channel included in the UHF channel 25. In this case, the broadcast signal receiving apparatus may assign a channel number greater than or equal to a specific number, for example, starting with No. 801 as shown in FIG. 2. Accordingly, channel numbers 1 and 2 included in the UHF channel 50 may be stored in the broadcast signal receiving apparatus as channel numbers 801 and 802, respectively. Alternatively, the broadcast signal receiving apparatus may store a channel number overlapping with an arbitrary unset channel number (channel numbers 6 and 7 according to the example of FIG. 2).

3 is a flowchart illustrating an embodiment of a broadcast signal receiving method. An embodiment of a broadcast signal receiving method will be described with reference to FIG. 3.

Channel search is performed (S10).

Channel information including the channel number of the searched channel as a result of the channel search is stored (S20). When the channel information is stored, a channel map is formed according to the performed channel scan result.

When a channel having the same channel number as the stored channel number is found as a result of sequentially searching the channels, that is, when two or more overlapping channels are found, the channel included in the weak strength broadcast signal among the duplicated channels is identified (S30). .

Whether two channels are duplicated can be determined from information parsed from the two signals. For example, the network identifier (original_network_id) for identifying a network where two broadcast signals are generated, the identifier for identifying a physical channel (transport_stream_id), and the identifier for identifying a program or service (service_id) are all the same. It may be determined as a duplicate channel. Alternatively, logical channel numbers of two signals may be the same channel.

The method of identifying the weak signal may, for example, set and display flag information on a channel number included in a weak strength broadcast signal, or reassign and store a logical channel number for a weak strength channel. For example, a flag value may be stored for a channel of a weak signal, or the logical channel number of a weak channel may be reset to zero. Therefore, if two channels of the same service content exist, the logical channel number of the signal transmitted through the channel of weak strength is stored as zero.

When the channel scan is completed, the weak strength of the duplicated channels is deleted from the channel map or reassigned to an arbitrary channel number (S40).

In step S30, a channel of weak strength with respect to the channel indicated by the identifier may be deleted from the channel list. A method of using a flag value for a weak intensity channel or reassigning a logical number of the channel to an arbitrarily set value is disclosed.

For example, a menu is displayed to ask a user whether to delete a weak strength broadcast channel among overlapping channels according to a scan result, and the channel signal is deleted by the broadcast signal receiving apparatus deleting the weak strength channel. Can be stored. In this case, a weak signal channel is not displayed in the channel list that is later displayed to the user.

Alternatively, an arbitrary channel number other than the channel number of the broadcast signal is allocated to a channel included in the signal of weak strength. For example, a menu is displayed for a user to save a broadcast channel of weak strength among the overlapping channels according to the scan result as a channel number without storing the channel number according to the scan result, so that the channel number of the weak intensity is converted to the third channel number. You can save it. Alternatively, the broadcast signal reception apparatus may store a channel list in which a weak strength channel is stored as an arbitrary channel number. The arbitrary channel number may be set to a specific number or more, or may be a channel number not stored as a result of the channel scan.

FIG. 4 is a diagram illustrating an embodiment of generating a channel map according to the broadcast signal reception method illustrated in FIG. 3.

First, it is assumed that the broadcast signal receiving apparatus sequentially searches for broadcast signals in the UHF frequency band according to the frequency band, and as a result of the search, the physical channels 25, 30, and 50 are sequentially searched. In addition, it is assumed that the physical channels 25 and 50 are broadcast signals transmitted from the first transmitter and the second transmitter in adjacent regions, respectively, and the broadcast contents included in the two broadcast signals are the same. For example, in a digital video broadcasting (DVB) system, a broadcast signal transmitted from a first transmitter and a second transmitter may include the same channel as original_network_id, transport_stream_id, and service_id, respectively.

4 is a channel map stored by a broadcast signal receiving apparatus and stores channel information of a broadcast signal transmitted to UHF 25. The original channel numbers of the two channels transmitted to UHF 25 are 1 and 2, respectively, and the channel names are channel1 and channel2, respectively, and the signal strength is 60. The broadcast signal receiving apparatus may store two channels transmitted to UHF 25 as channel numbers 1 and 2 according to channel numbers obtained from the broadcast signal.

Next, the channel numbers 3, 4, and 5 obtained from the received signal for the retrieved UHF 30 are stored in the channel map. In the example of FIG. 4, the channel names for channels 3, 4, and 5 are channel 3, channel 4, and channel 5, respectively, and the signal strength is 90.

The received signal from the searched UHF 50 includes broadcast signals set to channel numbers 1 and 2. This channel number may be a signal transmitted from another broadcast transmitter because the channel number is already stored by the broadcast signal receiving apparatus. Therefore, the size of the broadcast signal transmitting channels 1 and 2 is compared. The size of the signal received from UHF 25 is 60 and the size of the signal received from UHF 50 is 90. In this case, the channel numbers 1 and 2 of the broadcast signal received from UHF 25 are deleted from the stored channel map, and the logical channel number of the broadcast signal received from UHF 25 is assigned to an arbitrary value instead of the original channel number. Channel numbers 1 and 2 of the broadcast signal received from 50 may be stored in the channel map.

If you delete a weak intensity channel, you can display the channel number to be deleted through the menu and decide whether to delete it according to the user's selection. If not deleted by the user, it may be stored as an arbitrary channel number as shown in FIG. 5.

Accordingly, when a user inputs a channel or searches for and selects a channel from a channel list, the broadcast signal receiving apparatus displays broadcasts according to broadcast channel 1 or broadcast channel 2 transmitted from UHF 50 having a large signal size.

FIG. 5 is a diagram illustrating another embodiment of generating a channel map according to the broadcast signal reception method illustrated in FIG. 3. The assumption that the broadcast signal receiving apparatus searches for a broadcast signal and stores the found channel as a channel map is the same as in FIG. 4.

After searching for a broadcast signal, channels 1 and 2 included in the found channel UHF 25 are first stored in a channel map. The channel names of the searched two channels are channel1 and channel2, respectively, and the signal size is 60.

When UHF 30 is found, channel numbers 3, 4, and 5 transmitted to UHF 30 are stored in the channel map. Channel names of channel numbers 3, 4, and 5 are stored as channel 3, channel 4, and channel 5, respectively, and the broadcast signal of UHF 30 is 90.

Since the channel content of the UFH 50 is the same as the channel of the UHF 25, the broadcast signal receiving apparatus may store, in the channel map, a channel having the greater signal strength as the channel number assigned to the broadcast signal. In addition, a channel having a weak signal strength may be stored as a specific channel number or any channel number not used. In the example of FIG. 5, since the strength of the signal of the UHF 25 is small, the channel 1 and the channel 2 included in the broadcast signal of the UHF 25 are stored in the channel 801 and the channel 802, respectively, and the logical number of the broadcast signal included in the UHF 25 is arbitrary. Assign to an unused channel number. Channels 1 and 2 included in the UHF 50 signal are stored as channel numbers included in the original broadcast signal. Therefore, when the user selects channel 1, the broadcast signal receiving apparatus expresses channel 1 of UHF 50, and when channel 2 is selected, expresses channel 2 of UHF 50. When the user selects channel numbers 801 and 802, the broadcast signal receiving apparatus expresses a broadcast signal of UHF 25.

In FIG. 5, when a channel having a weak intensity is stored as an arbitrary channel number, channel numbers not stored as a result of the current scan may be sequentially stored as, for example, channel numbers 6 and 7. Alternatively, when a channel of weak strength is stored, an arbitrary channel number to be stored can be expressed through a menu to the user and stored as a channel number set by the user.

6 is a diagram illustrating an example of a broadcast signal receiving apparatus. An embodiment of the broadcast signal receiving apparatus illustrated in FIG. 6 includes a tuner 510, a demodulator 520, a demultiplexer 530, a decoder 540, a display 550, a controller 560, and a memory. A unit 570, and a section information decoding unit 580.

Referring to FIG. 6, an operation of an embodiment of a broadcast signal receiving apparatus will be described.

The tuner 510 receives a broadcast signal and selects and outputs a broadcast signal of a channel according to the control signal of the controller 560 from the received broadcast signal. The tuner 510 may scan a broadcast channel and search for all channels received by the broadcast signal receiving apparatus from another broadcast transmitter.

The demodulator 520 may demodulate and output a signal of a channel tuned by the tuner 510. The demodulator 520 demodulates and outputs a broadcast signal of a broadcast channel scanned by the tuner 510.

The demultiplexer 530 may provide information about the section information (service information (SI) or program specific information / program and system information protocol (PSI / PSIP)) and the audio / video stream among the signals demodulated by the demodulator 520. Each can be demultiplexed. The demultiplexer 530 may output section information included in the channel-scanned broadcast signal to the section information decoder 580.

The decoder 540 may decode the audio / video streams demultiplexed by the demultiplexer 530, respectively. The decoder 540 decodes the audio / video stream and outputs it to the display unit 550.

The display unit 550 receives and expresses an audio / video signal decoded by the decoder 540. The display unit 550 includes a graphic interface (OSD) for displaying a graphic signal displayed on a display screen.

The section information decoder 580 may decode section information in a section form including multiplexed information about a service or a program demultiplexed by the demultiplexer 530, and temporarily store the decoded information. When the tuner 510 performs a channel scan, the section information decoder 580 may parse section information according to the tuned broadcast channel and output channel information to the controller 540. The section information decoder 580 may store the parsed section information in the section information storage unit.

The controller 560 includes an interface unit that receives a control signal from a user. When the tuner 510 performs a channel scan from the section information decoder 580, the controller 560 receives channel information about the scanned channels. The channel map may be generated using the list information of each channel according to the received channel information, and stored in the channel map storage. The channel stored in the channel map may be stored at the same value even after the broadcast signal receiver is powered off.

When the user selects a channel, the controller 560 may control the tuner 510 to tune the selected channel using channel information of the channel map. The broadcast signal included in the tuned channel is output through the demodulator 520, the demultiplexer 530, the decoder 540, and the display unit 550, so that the broadcast of the channel selected by the user may be output.

In addition, the controller 560 may store other control information such as information on an application and information requested by a user in the memory unit 570.

Meanwhile, when the tuner 510 generates the channel map using the channel information obtained through the channel scan, the controller 560 may determine whether there is a duplicate channel having the same channel content among the channel information. The control unit 560 is the same as the network identifier (original_network_id) for identifying the network where the broadcast signal is generated, the identifier (transport_stream_id) for identifying the physical channel, and the identifier (service_id) for identifying the program or service are all the same. It may be determined as a duplicate channel. Alternatively, when the logical channel number is the same among the channel information parsed from the broadcast signal, it may be determined as a duplicate channel.

The tuner 510 may detect the strength of the received broadcast signal and may output the detected broadcast strength to the controller 560. If there is a duplicate channel while generating a channel map according to the broadcast channel output by the tuner 510, the controller 560 may have a weaker intensity among the overlapped channels according to the strength of the broadcast signal output by the tuner 510. The channel included in the broadcast signal may be determined. In such a case, the controller 560 may place an identifier for a channel of weak signal strength. For example, a flag of weak signal strength among the overlapped channels may be displayed as flag information or the logical number of the channel may be reset to zero.

When the channel scan of the tuner 510 is completed, channels having weak signal strength are deleted from the channel map, or a channel map is generated by sequentially assigning random channel numbers different from the channel numbers set by the original broadcasting station. can do. An example of generating an arbitrary channel number may refer to FIG. 5.

FIG. 7 illustrates an example of displaying a menu on a weak channel among channels provided with the same program / service as a result of a channel scan.

In the example of (a), a menu is displayed to the user to indicate whether to delete a channel of weak strength. The user may delete the weak strength channel from the channel map so that the broadcast signal receiving apparatus does not tune the weak strength channel, and the broadcast of the weak strength channel may not be selected.

The example of (b) shows whether or not a weak intensity channel is stored as another channel with a different channel number in the channel map. The user can save the weak intensity channel as an arbitrary default channel expressed in (b) or save the weak intensity channel as a new channel number by entering a new channel in the default channel displayed on the menu. Can be.

Thus, the user can easily select a channel having a strong signal strength rather than a channel having a weak signal strength through the generated channel map. Therefore, the user can select a weak signal to eliminate the inconvenience that the display of the broadcast signal is stopped. In addition, channel information may be quickly scanned during power setup of the broadcast signal receiving apparatus, thereby reducing setup time and reducing channel switching time.

1 is a diagram illustrating an example in which a broadcast signal receiving apparatus receives a signal;

2 is a diagram illustrating an example of a channel map showing the example described above.

3 is a flowchart illustrating an embodiment of a broadcast signal receiving method.

4 is a diagram illustrating an embodiment of generating a channel map according to the broadcast signal receiving method illustrated in FIG. 3.

FIG. 5 is a diagram illustrating another embodiment of generating a channel map according to the broadcast signal reception method illustrated in FIG. 3.

6 illustrates an embodiment of a broadcast signal receiving apparatus with reference to FIG. 6

7 illustrates a processing menu for a weak channel among channels of the same content.

Claims (9)

Searching for a channel using the received signal and generating a channel list by storing channel numbers including the first channel; Identifying a channel received with a weak strength among the first channel and the second channel when a second channel provided with the same service as the stored first channel is found; And And generating a channel list storing the identified channel as an arbitrary channel number different from the channel number, or generating a channel list deleted from the stored list. The method of claim 1, The identifying may include setting a flag on a channel received at the weak strength. The method of claim 1, The identifying may include assigning a logical channel number of a channel received at the weak strength as a third value. The method of claim 1, Whether the first channel and the second channel are the channels providing the same service may include a network identifier for identifying a network where a broadcast signal is generated, an identifier for identifying a physical channel, and a program or service. The broadcast signal receiving method for determining whether the value of the identifier is the same. The method of claim 1, And determining whether the first channel and the second channel are channels that provide the same service based on whether the logical channel numbers of the first channel and the second channel are the same. A tuner for receiving a broadcast signal and searching for a channel of the received broadcast signal; A demodulator for demodulating a signal searched and tuned by the tuner; A demultiplexer for demultiplexing a signal demodulated by the demodulator; A section information decoder which parses section information output by the demultiplexer; A decoder which decodes the video or audio signal which is demultiplexed by the demultiplexer; And Outputs a control signal according to a user control command, stores a channel list searched by the tuner, and when the tuner searches for a second channel providing the same service as the first channel, a weak one of the first channel and the second channel And a control unit for storing the received channel as an arbitrary channel different from the original channel number of the channel or deleting the channel from the channel list. The method of claim 6, And the control unit identifies whether the first channel and the second channel are channels that provide the same service by using channel identification information parsed by the section information decoder. The method of claim 7, wherein And the channel identification information is a network identifier for identifying a network where a broadcast signal is generated, an identifier for identifying a physical channel, and an identifier for identifying a program or service. And the channel identification information is a logical channel number of the first channel and the second channel.

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