KR101435829B1 - apparatus for receiving a broadcast signal and method thereof - Google Patents

Abstract

The present invention relates to a broadcast signal receiving apparatus and a broadcast signal receiving method. The method includes searching for a channel using a received signal and storing channel numbers including the first channel to generate a channel list, and when a second channel provided with the same service as the stored first channel is searched, Identifying a channel to be received at a weaker one of the channel and the second channel and generating a channel list storing the identified channel with an arbitrary channel number different from the channel number, The method comprising the steps of:

Channel, map, list, signal, intensity, tuner

Description

[0001] The present invention relates to a broadcast signal receiving apparatus and a broadcast signal receiving method,

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

A device capable of receiving a broadcast can generally perform channel scanning. For example, a broadcast signal receiving apparatus such as a set-top box, a digital television, and a mobile communication terminal receiving a broadcast receives a broadcast signal and obtains a channel of the broadcast signal . However, if the intensity of the received broadcast signal is weak, the broadcast signal displayed on the broadcast signal receiving apparatus may be interrupted due to the weak intensity signal. However, the broadcast signal receiving apparatus provides the user with all the channels obtained by scanning the channel through the channel scan, regardless of the strength of the received signal. Accordingly, there is a problem in that a user can select a broadcast received from a channel having a weak signal intensity, and thus view a broadcast having poor reception performance. In addition, when a broadcast signal having a weak signal intensity is selected, the broadcast presentation may be interrupted, and the power setup of the broadcast signal receiving apparatus may be delayed by the channel scan operation. Also, when the user selects a channel having a weak signal strength, there is a problem that the channel switching time may be delayed.

SUMMARY OF THE INVENTION It is an object of the present invention to provide a broadcast signal receiving apparatus and a broadcast signal receiving method that can provide a user with convenience in viewing broadcasts and selecting a channel.

Another object of the present invention is to provide a broadcast signal receiving apparatus and a broadcast signal receiving method capable of allowing a user to select a channel having a high signal strength and reducing a setup time and a channel switching time of the broadcast signal receiving apparatus.

According to an aspect of the present invention, there is provided a method of generating a channel list, the method comprising: searching a channel using a received signal and storing channel numbers including a first channel to generate a channel list; The method comprising the steps of: identifying a channel received at a weak intensity of the first channel and the second channel when a channel is searched; generating a channel list storing the identified channel with an arbitrary channel number different from the channel number; And generating a channel list deleted from the list.

The identifying step may set a flag on the channel received with the weak intensity. The identifying step may assign a logical channel number of a channel received with the weak intensity to a third value.

Whether the first channel and the second channel are channels providing the same service includes a network identifier capable of identifying a network in which a broadcast signal is generated, an identifier capable of identifying a physical channel, It can be determined whether or not the values of the identifiers are the same. Alternatively, whether the first channel and the second channel are channels providing the same service can be determined by determining whether the first channel and the second channel have the same logical channel number.

According to another aspect of the present invention, there is provided a tuner comprising: a tuner for receiving a broadcast signal and searching for a channel of a received broadcast signal; a demodulator for demodulating a signal tuned by the tuner; a demultiplexer for demultiplexing the demodulated signal; A decoding unit for decoding a video or audio signal demultiplexed by the demultiplexing unit, a control unit for outputting a control signal according to a user control command, And when the tuner searches for a second channel that provides the same service as the first channel, the channel received at a weak intensity of the first channel and the second channel is selected as an arbitrary channel number different from the original channel number of the channel And a controller for storing the channel 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 can easily view broadcasting and select a channel. In addition, the user can select a channel having a large signal strength, and the setup time and 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. Generally, a broadcast signal receiving apparatus includes a function of automatically searching for a channel when set up. This automatic channel search is called auto program or auto scan. When a broadcast signal receiving apparatus performs such a function, multiplexed information on a program or a service, for example, a program association table (PAT), a program map table (PMT), a service description table (SDT) PSI / program information (PSI / PSIP) such as service information and virtual channel table (VCT). The parsed information includes channel information for performing a channel search. The broadcast signal receiving apparatus stores the channel information in a memory, and when the user selects a channel, the packet ID of the video / audio stream of the selected channel identifier. The broadcast signal receiving apparatus filters the set packet, decodes a stream received from a desired channel, and outputs a broadcast signal.

However, as illustrated in FIG. 1, the broadcast signal receiving apparatus may receive a broadcast signal from a broadcast transmitter that transmits two or more broadcast signals including different channels. As shown in 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 an adjacent broadcast transmitter.

Here, the meaning of a channel having the same program / service content is that, for a broadcast signal received from an area of another channel, for example, a network identifier (original_network_id) capable of identifying a network in which a broadcast signal is generated, (Transport_stream_id), and an identifier (service_id) capable of identifying a program or a service are the same. That is, the physical frequency band to which the broadcast signal is transmitted may be different, or the logical channel number may be different. However, two or more channels including the same program / service content may be duplicated channels or the same channel. In this case, there is a channel having the same logical channel number among the channels transmitted from different broadcast transmitters, although it is not a channel through which a program / service with redundant contents is transmitted.

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

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

If 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 can receive two or more broadcast signals including the same contents from two or more broadcast transmitters in an adjacent area, and store the channel numbers in the received channel, respectively. The broadcast signal receiving apparatus can assign a channel number to each channel regardless of the signal strength when storing the channels of 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 channels having the same contents. In such a case, the broadcast signal receiving apparatus firstly assigns a channel number corresponding to the first channel to a first channel included in a broadcast signal having a small frequency (here assumed to be a broadcast signal of the first transmitter including the first channel) , A third channel number that is not a channel number corresponding to the second channel may be assigned to a second channel included in a broadcast signal having a high frequency (herein assumed to be a broadcast signal of a second transmitter including the second channel). Thus, even two identical channels can be stored with different channel numbers.

When a broadcasting signal including the same contents is received, the first channel having a small physical frequency is first stored, and the first channel is originally stored as a channel number to be assigned to the first channel. Since the second channel having a large physical frequency is searched at the time of the channel scan, it can not be stored in the same channel number as the first channel, and a different channel number than the first channel number can be assigned and stored.

However, in general, the intensity of the broadcast signal including the first channel is different from the intensity of the broadcast signal of the second channel. In the example of FIG. 1, even if the intensity of the broadcast signal for the first channel among the broadcast signal for the first channel and the broadcast signal for the second channel is small, the first channel number is stored as a channel number that identifies the original channel However, the second channel is stored in the broadcast signal receiving apparatus with a different channel number than the channel number to be assigned to the second channel number even if the intensity of the signal is large. Therefore, even if the first channel and the second channel have the same content, the first channel is stored in the original channel number, so that the user is likely to select the first channel first in the channel list. However, if the user selects a first channel having a weak signal intensity among the first channel and the second channel having the same channel content, the user may not normally receive the program or service such as the screen is disconnected. On the other hand, the second channel having a large signal intensity may not be able to memorize which channel number is stored, which is inconvenient for channel selection.

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

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

It is assumed that the broadcasting station has allocated channel numbers 1 and 2 of the broadcasting signal transmitted to the UHF channel 25, and the channel numbers are assumed to be channel 1 and channel 2, respectively. It is assumed that the intensity of the broadcast signal received at the UHF 25 in the broadcast signal receiving apparatus is 60.

Similarly, it is assumed that channels 3, 4, and 5 are assigned to channel numbers of a broadcast signal transmitted to a UHF channel 30 in a broadcasting station, and channel 3, channel 4, and channel 5 are assigned channel names. It is assumed that the intensity of the broadcast signal received by the broadcast signal receiving apparatus at UHF # 30 is 90.

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

Assume that a broadcast signal is received from another broadcast transmitter other than the above-mentioned broadcast signal, and the channel number of the transmitted UHF band is 50. [ In the example of FIG. 2, the channel transmitted through the channel number 50 in the UHF band is the same channel as the UHF channel 25. Thus, the broadcast signal receiving apparatus can receive UHF channel 25 and UHF channel 50 having the same channel contents in different physical frequency bands.

When the broadcast signal receiving apparatus receives the broadcast signal, it generates a channel map according to the channel number and stores the channel list. 2, the broadcast signal receiving apparatus can store channels included in the UHF channel 25 as channel numbers 1 and 2, and channels included in the UHF channel 25 as channel numbers 3, 4, and 5, respectively, according to a channel search order have.

Since the channel numbers 1 and 2 included in the UHF channel 50 are already stored in the channels included in the UHF channel 25, they can be stored at different channel numbers. In this case, the broadcast signal receiving apparatus can assign a channel number from a specific number or more, for example, from 801 as shown in FIG. Accordingly, the channel numbers 1 and 2 included in the UHF channel 50 can be stored in the broadcasting signal receiving apparatuses with channel numbers 801 and 802, respectively. Alternatively, the broadcasting signal receiving apparatus may store channel numbers that are duplicated by any 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.

Channel search is performed (S10).

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

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

Whether two channels are overlapping channels can be determined from the information parsed from the two signals. For example, when a network identifier (original_network_id) capable of identifying a network in which two broadcast signals are generated, an identifier (transport_stream_id) capable of identifying a physical channel, and an identifier (service_id) It can be judged as a duplicate channel. Or the logical channel number of the two signals may be the same channel.

The weak signal can be identified by, for example, setting flag information for a channel number included in a broadcast signal having a weak intensity, or reallocating and storing a logical channel number for a channel having a weak intensity. For example, you can store a flag value for a weak signal channel, or reset the logical channel number of a weak channel to zero. Therefore, when two service contents have the same channel, the logical channel number of the signal transmitted through the channel of weak intensity is stored as zero.

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

It is possible to delete a channel having a weak intensity for the channel indicated by the identifier in the channel list in step S30. A method has been disclosed in which a flag value is used for a weak intensity channel or a logical number of the channel is reallocated to an arbitrary set value.

For example, the user is prompted to inquire whether or not to delete a broadcast channel of a weak intensity among the overlapping channels according to the scan result, or the broadcast signal receiving device deletes the channel of weak intensity, Can be stored. In this case, channels of weak signals are not displayed in the channel list displayed to the user in the future.

Or assigns a channel number other than the channel number of the broadcast signal to a channel included in the signal of weak intensity. For example, a menu is displayed to allow the user to store broadcast channels of a weak intensity among the overlapping channels according to the scan result in a channel number in which the channel number is not stored according to the scan result, so that the channel number of weak intensity is changed to the third channel number . Alternatively, the broadcast signal receiving apparatus may store a channel list in which a channel having a weak intensity is stored with an arbitrary channel number. An arbitrary channel number may be set to a specific number or more, or a channel number that is not stored as a result of channel scan.

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

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 the physical channels 25, 30, and 50 are sequentially searched as a result of the search. It is also assumed that the physical channels 25 and 50 are the broadcast signals transmitted from the first transmitter and the second transmitter in the adjacent region, respectively, and the broadcast contents included in the two broadcast signals are the same. For example, in a digital video broadcasting (DVB) system, broadcast signals transmitted from the first transmitter and the second transmitter may include channels having the same original_network_id, transport_stream_id, and service_id.

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

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

The signals received by the UHF 50 include broadcast signals set to channel numbers 1 and 2. This channel number may be a signal transmitted from another broadcast transmitter since it is a number already stored by the broadcast signal receiving apparatus. The size of the signal received from UHF 25 is 60, the size of the signal received from UHF 50 is 90, and the size of the signal received by UHF 50 is large , The channel numbers 1 and 2 of the broadcast signal received from the UHF 25 are deleted from the stored channel map and the logical channel number of the broadcast signal received from the UHF 25 is assigned to an arbitrary value other than the original channel number. 1 and 2, which are channel numbers of broadcast signals received from the base station 50, in the channel map.

When a channel having a weak intensity is deleted, the channel number to be deleted may be displayed through a menu and the user may decide whether to delete the channel number. If the user does not delete it, it can be stored as an arbitrary channel number as shown in FIG.

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

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

The broadcast signals are searched and the channels 1 and 2 included in the UHF 25, which is the searched channel, are first stored in the channel map. The channel names of the two channels searched are channel 1 and channel 2, respectively, and the signal size is 60.

When UHF 30 is detected, channel numbers 3, 4, and 5, which are 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. UHF 30 broadcast signal 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 can store a channel having a greater signal intensity among the two channels in a channel map as a channel number assigned to the broadcast signal. A channel with weak signal strength can be stored with a specific channel number or an unused channel number. 5, the channel 1 and channel 2 included in the UHF 25 broadcast signal are respectively stored in the channels 801 and 802, and the logical number of the broadcast signal included in the UHF 25 is arbitrary To the unused channel number. Then, channel 1 and channel 2 included in the signal of UHF 50 are respectively stored as channel numbers included in the original broadcast signal. Accordingly, when the user selects channel 1, the broadcasting signal receiving apparatus displays channel 1 of UHF 50, and when channel 2 is selected, channel 2 of UHF 50 is displayed. When the user selects the channel numbers 801 and 802, the broadcasting signal receiving apparatus displays the UHF 25 broadcasting signal.

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

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

The operation of the broadcast signal receiving apparatus according to an embodiment will be described with reference to FIG.

The tuner 510 receives a broadcast signal and selects and outputs a broadcast signal of a channel according to a control signal of the control unit 560 among the received broadcast signals. The tuner 510 can scan a broadcast channel and search all the channels received by the broadcast signal receiving apparatus from other broadcast transmitters.

The demodulation unit 520 can demodulate and output a signal of a channel tuned by the tuner 510. The demodulation unit 520 demodulates and outputs a broadcast signal of a broadcast channel scanned by the tuner 510.

The demultiplexer 530 demultiplexes the information demodulated by the demultiplexer 520 into information of service information SI or program specific information / program and system information protocol (PSI / PSIP) Each can be demultiplexed. The demultiplexing unit 530 may output the section information included in the channel-scanned broadcast signal to the section information decoding unit 580.

The decoding unit 540 can decode the audio / video streams demultiplexed by the demultiplexing unit 530, respectively. The decoding unit 540 decodes the audio / video stream and outputs the decoded audio / video stream to the display unit 550.

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

The section information decoding unit 580 can decode section information in the form of a section including multiplexing information for a demultiplexed service or program by the demultiplexing unit 530 and temporarily store the decoded information. The section information decoding unit 580 parses the section information according to the broadcast channel tuned when the tuner 510 performs channel scanning, and outputs channel information to the control unit 540. The section information decoding unit 580 may store the parsed section information in the section information storage unit.

The control unit 560 includes an interface unit for receiving a control signal from a user. When the tuner 510 scans the channel from the section information decoding unit 580, the control unit 560 receives channel information on the scanned channels. In accordance with the received channel information, the channel map may be generated using the list information for each channel, and the channel map may be stored in the channel map storage unit. The channel stored in the channel map may be stored at the same value even after the broadcast signal receiving apparatus is powered off.

The controller 560 may control the tuner 510 to tune the selected channel using the channel information of the channel map when the user selects the channel. The broadcast signal included in the tuned channel may be outputted through the demodulation unit 520, the demultiplexing unit 530, the decoding unit 540, and the display unit 550, and the broadcast of the channel selected by the user may be output.

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

On the other hand, when the tuner 510 generates the channel map using the channel information obtained through the channel scan, the controller 560 can determine whether there is a duplicated channel having the same channel content among the channel information. The control unit 560 receives a broadcast signal including a network identifier (original_network_id) capable of identifying the network where the broadcast signal is generated, an identifier (transport_stream_id) capable of identifying a physical channel, and identifiers (service_id) It can be judged as a duplicate channel. Or if the logical channel number of the channel information parsed from the broadcast signal is the same, it can be determined as a duplicate channel.

The tuner 510 can detect the intensity of the received broadcast signal and output the detected intensity of the broadcast to the control unit 560. The control unit 560 generates a channel map according to the broadcast channel output from the tuner 510. When there is an overlapped channel, The channel included in the broadcast signal can be determined. In such a case, the control unit 560 may set an identifier for a channel of weak signal strength. For example, it is possible to display flag information on a channel having weak signal strength among duplicated channels, or to reset the channel's logical number to zero.

When the channel scan of the tuner 510 is terminated, channels having weak signal strength are deleted from the channel map, or a channel map different from the channel number originally set by the broadcasting station is sequentially given to generate a channel map can do. An example of generating an arbitrary channel number may be referred to FIG.

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

(a) is an example in which a menu is displayed to the user as to whether or not to delete a channel having a weak intensity. The user can delete the weak intensity channel from the channel map so that the broadcast signal receiving apparatus does not tune the channel of weak intensity and the broadcast of the weak intensity channel can be prevented from being selected.

(b) shows an example of whether or not to store a channel having a weak intensity to another channel with a different channel number in the channel map. The user may store a weak intensity channel on any default channel displayed in (b), or a user may enter a new channel on a menu-displayed default channel to store the weak intensity channel as a new channel number .

Accordingly, 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 and eliminate inconveniences such as interruption of the display of the broadcast signal. In addition, the channel information can be quickly scanned at the time of power setting of the broadcast signal receiving apparatus, so that the setup time can be shortened and the channel switching time can be shortened.

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

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

3 is a flow chart 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.

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

6 is a diagram illustrating an embodiment of a broadcast signal receiving apparatus with reference to FIG.

7 is a diagram illustrating a processing menu for a weak channel among the channels having the same contents

Claims (9)

Retrieving a channel using the received signal and storing channel numbers including the first channel to generate a channel list; When a second channel provided with the same service as the stored first channel is searched, a flag is set to a channel received at a weak intensity of the first channel and the second channel to identify a channel received at the weak intensity ; And Generating a channel list in which the identified channel is designated by an arbitrary channel number different from the channel number of the identified channel or generating a channel list in which the identified channel is deleted from the generated channel list; And receiving the broadcast signal. The method according to claim 1, Whether the first channel and the second channel are channels providing the same service can be determined by a network identifier capable of identifying a network in which a broadcast signal is generated, an identifier capable of identifying a physical channel, And judges whether the values of the identifiers are the same. The method according to claim 1, And determining whether the first channel and the second channel are the same channel providing the same service if the first channel and the second channel have the same logical channel number. A tuner for receiving a broadcast signal and searching for a channel of the received broadcast signal; A demodulator for demodulating a signal tuned by the tuner; A demultiplexer for demultiplexing the demodulated signal; A section information decoding unit parsing the section information outputted by the demultiplexing unit; A decoding unit for decoding the video or audio signal demultiplexed by the demultiplexing unit; And Wherein the control unit 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 flag is set to a channel received with a strength to identify a channel received with the weak intensity and to a channel number other than the original channel number of the channel received with the weak intensity, A control unit for deleting the channel from the channel list; The broadcast signal receiving apparatus comprising: 5. The method of claim 4, Wherein the control section identifies whether the first channel and the second channel are channels providing the same service using the channel identification information parsed by the section information decoding section. 6. The method of claim 5, Wherein the channel identification information is a network identifier capable of identifying a network in which a broadcast signal is generated, an identifier capable of identifying a physical channel, and an identifier capable of identifying a program or a service. 6. The method of claim 5, Wherein the channel identification information is a logical channel number of the first channel and the second channel. delete delete

Images