KR20110070371A - Apparatus and method for receiving a broadcasting signal - Google Patents

Abstract

PURPOSE: A broadcasting receiving apparatus and method are provided to improve channel receive capability in various broadcasting reception environments. CONSTITUTION: According to the execution of channel search, a broadcasting receiving apparatus receives a broadcasting signal corresponding to a first channel(S101,S103). According to the presence of a broadcasting signal offered through the first channel, the apparatus extracts additional information included in the broadcasting signal(S104,S105). The apparatus composes arbitrary channel information about the first channel(S107). The apparatus registers the channel information of the first channel in a channel map(S109).

Description

Apparatus and method for receiving a broadcasting signal

The present invention relates to a broadcast receiving apparatus, and more particularly, to a broadcast receiving apparatus and method for receiving a broadcast signal to configure information about a broadcast channel.

In general, the broadcast reception device receives a data stream including a broadcast signal, extracts a video and audio data stream corresponding to a channel desired by a user using service information included in the received data stream, and outputs the stream to the display device.

Digital television receivers, for example, have the ability to convert incoming broadcast signals into digital codes to add high-quality screen playback and add features. In digital broadcasting, video and audio streams are compressed and broadcast as digital information, and system information and program information are compressed and broadcast in accordance with the Program and System Information Protocol (PSIP) standard.

On the other hand, during the automatic channel search of the broadcast receiving device, after locking is performed at the front end (Tuner, Demodulator), PAT / PMT / MGT / TVCT / CVCT information included in the PSI / PSIP information. When the information is normally received accordingly, the information about the corresponding channel is constructed using the information and stored in the channel map.

However, although the lock is normally performed at the front end at the time of automatic channel discovery, if the PSI / PSIP information is not normally received, such channel information cannot be configured and thus the corresponding channel is not stored in the channel map.

Accordingly, there is a need for a method for more efficiently constructing a channel map according to a broadcast reception environment.

According to an embodiment of the present invention, when a substantially valid signal exists but PSI / PSIP information does not exist, the broadcast reception device stores the information on a corresponding channel in a channel map so that channel switching to the channel is performed. And methods.

In addition, the embodiment of the present invention provides a broadcast receiving apparatus and method for checking the channels registered in the channel map abnormally at regular intervals to register the channel normally in the channel map or to delete the channel from the channel map. to provide.

The technical problems to be achieved in the proposed embodiment are not limited to the technical problems mentioned above, and other technical problems not mentioned above are clear to those skilled in the art to which the proposed embodiments belong from the following description. Can be understood.

A broadcast receiving method according to an embodiment of the present invention includes the steps of receiving a broadcast signal corresponding to a first channel according to channel search execution; Extracting additional information included in the broadcast signal according to the presence or absence of a broadcast signal provided through the first channel; If the extracted additional information does not exist, configuring arbitrary channel information for the first channel; And registering channel information of the configured first channel in a channel map.

In addition, the broadcast receiving apparatus according to an embodiment of the present invention includes a broadcast signal receiving unit for receiving a broadcast signal; An additional information extracting unit which extracts additional information from the received broadcast signal; A CM (Channel Manager) unit configured to configure channel information by using the extracted additional information and to configure a channel map by registering the configured channel information in a channel map; A storage unit for storing a channel map configured through the CM unit; And a controller configured to control a channel map to be configured based on the additional information, and to control a corresponding channel to be registered in the channel map based on arbitrary channel information with respect to a channel in which the additional information does not exist.

According to an embodiment of the present invention, a channel for which additional information is not normally received due to a broadcast reception environment is stored in a channel map for a predetermined time, and accordingly, a normal channel for the channel at a time when the broadcast reception environment is normally changed. By reconfiguring the information, there is an effect of improving channel reception capability in various broadcast reception environments.

The proposed embodiment will be described.

Hereinafter, specific embodiments of the present invention will be described in detail with reference to the drawings. However, the spirit of the present invention is not limited to the embodiments presented, and other inventions which are further deteriorated by addition, change, deletion, etc. of other components, or other embodiments included within the scope of the present invention can be easily made. I can suggest.

The term used in the present invention was selected as a general term widely used as possible, but in some cases, the term is arbitrarily selected by the applicant, in which case the meaning is described in detail in the description of the invention, the name of a simple term It should be clear that the present invention is to be understood as a meaning of terms.

In other words, in the following description, the word 'comprising' does not exclude the presence of other elements or steps than those listed.

1 is a diagram illustrating a configuration of a broadcast receiving apparatus according to an embodiment of the present invention.

Referring to FIG. 1, the broadcast receiving apparatus includes a tuner 110, a demodulator 120, a demultiplexer 130, a signal processor 140, a display 150, an additional information extractor 160, and a CM. The unit 170 is configured to include a storage unit 180 and a controller 190.

The tuner 110 receives a signal desired by a user, that is, a broadcast signal of a specific channel selected by the user, from among broadcast signals transmitted through a wired / wireless medium. The broadcast signal may be a terrestrial broadcast, satellite broadcast, or cable broadcast signal. The tuner unit 110 may include an RF antenna 112 for detecting a broadcast signal from the air and a tuner 114 for tuning a signal of a desired channel among various broadcast signals and converting the tuned signal to an intermediate frequency. Can be. If the cable broadcast is received, the RF antenna 112 may be replaced by a signal input unit (not shown) of the cable modem.

The tuner 114 provides the demodulator 120 with the signal converted into the intermediate frequency. Then, the demodulator 120 restores a transport stream from the signal converted from the intermediate frequency, and provides the restored transport stream to the demultiplexer 130.

Reference will be made to FIG. 2 to describe the operations occurring in the tuner unit 110 and the demodulator 120 in more detail. FIG. 2 is a diagram illustrating a detailed configuration of the tuner unit and the digital demodulation unit of FIG. 1.

First, the tuner unit 110 may include an RF antenna 112, a tuner 114, a SAW filter 116, and a PLL circuit 118. In addition, various commands of the user may be input to the controller 190 through a remote controller (not shown).

The tuner 114 converts the RF signal (e.g., 50-860 MHz) into an IF (middle frequency) signal (e.g., 44 MHz) and passes it to the SAW filter 116.

The SAW filter 116 removes adjacent channel signals and removes noise signals from the intermediate frequency signal transmitted from the tuner 114, and outputs the result to a phase locked loop (PLL) circuit 118.

The PLL circuit 118 calculates a difference between the signal output from the SAW filter 116 and the signal output from the first VCO (Voltage Controlled Oscillator (not shown)) and repeatedly reduces the voltage of the VCO in the direction of reducing the difference. Adjust it. The state in which the phase difference between the two signals disappeared by the loop repetition process is called locked.

When the controller 190 receives a selection command of a specific channel and a change command to a specific channel (button input, remote control input, etc.) from the user, the controller 190 transmits a signal notifying that the user command is present to the tuner unit 110. The demodulator 120 controls demodulation according to the demodulation scheme for the channel to be switched accordingly.

The demodulator 120 may include an AGC amplifier 122, an A / D converter 124, and a symbol recovery unit 126.

The AGC amplifier 122 compensates the gain of the signal output from the signal receiver 110 and outputs a signal capable of A / D conversion. That is, since the signal passing through the SAW filter 116 is weak, the output of the tuner 110 is compensated for by the signal gain that the A / D converter 124 of the rear stage can normally A / D convert.

The A / D converter 124 converts the signal amplified by the AGC amplifier 122 into a digital signal according to the sampling frequency generated by the second VCO (not shown) and outputs the digital signal to the symbol recovery unit 126.

The symbol recovery unit 126 is used by the A / D converter 124 according to the demodulation scheme (VBS-8, VSB-16, QAM64, QAM256, QAM1024, DPSK, QPSK, etc.) selected by the controller 190. Recover the transmitted symbols from the digitally converted signal. The symbol recovery unit 126 recovers the transmission symbol and outputs the result to the demodulation unit 120. As shown in FIG. 3, the symbol recovery unit 126 may be subdivided into an error interpolator 126a, a carrier recovery unit 126b, a channel equalizer 126c, and a channel decoder 126d. .

The error interpolator 126a receives feedback of timing errors of symbols coming from the baseband signal processing, for example, transmission symbols decoded by the channel decoder 126d. Then, using a resampler (not shown), the interpolation is performed in a direction of reducing an error between the digital signal output from the A / D converter 124 and the received signal and the result is returned to the carrier recovery unit ( 126b).

The carrier recovery unit 126b removes the frequency offset and phase noise of the carrier from the bandpass digital signal, and basebands the bandpass digital signal from which the frequency offset and phase noise have been removed. -band) The digital demodulated signal is output to the channel equalizer 126c.

The channel equalizer 126c removes the inter-symbol interference by the multipath included in the signal recovered by the carrier recovery unit 126b, and then outputs the result to the channel decoder 126d. That is, in a digital transmission system such as HDTV, a bit detection error occurs at a receiving side due to distortion generated by a multi-path channel, interference by an NTSC signal, and distortion by a transmission / reception system. Since signal propagation through a path causes intersymbol interference and is a major cause of bit detection error, the channel equalizer 126c is employed to eliminate the symbol interference.

The channel decoder 126d uses the Reed-Solomon coding scheme and the lattice modulation code scheme to collect congestion noise present on a channel included in a signal from which interference is removed between symbols in the channel equalizer 126c. Excessive scattering noise is removed, and the synchronization signals that were inserted at the time of transmission from the baseband signal are recovered, and the received data, that is, the transmission symbols are recovered using the synchronization signals.

Referring back to FIG. 1, data demodulated by the demodulator 120 and outputted, for example, a transport stream (TS), are input to the demultiplexer 130. Under the control of the controller 190, the demultiplexer 130 parses the provided transport stream into video signals, audio signals, and additional information signals, and provides the separated signals to respective processing blocks.

The signal processor 140 processes the video signal and the audio signal output through the demultiplexer 130, respectively. In this case, the signal processor 140 includes an image processor 142 for processing a video signal and a voice processor 144 for processing an audio signal.

That is, the video signal separated by the demultiplexer 130 is processed through the image processor 142 and output through the display unit 150, and the separated audio signal is connected to the voice processor 144. The signal is processed through the display unit 150 is output. Accordingly, the display unit 150 includes a display unit for displaying an image and a speaker for outputting audio.

In this case, the image processor 142 may be a video decoder that decodes the video signal to restore a video image. Such a video decoder may be implemented according to, for example, a video decompression scheme (MPEG-1, MPEG-2, MPEG-4, etc.) of the Moving Picture Experts Group (MPEG) series.

4 is a diagram illustrating a detailed configuration of the image processor 142. The image processor 142 includes a variable length decoder 142a, a frame reader 142b, an inverse quantizer 142c, an inverse spatial converter 142d, an adder 142e, and a frame memory 142f. ), And a motion compensation unit 142g.

The variable length decoder 142a receives the compressed video signal output from the demultiplexer 130 and performs variable length decoding. Such variable length decoding is a decoding method for lossless coding performed by displaying an array of bits more efficiently.

The frame reading unit 142b reads the texture information and the motion information of the video frame from the bit string that is losslessly restored by the variable length decoding, and the read texture information is decoded to the dequantization unit 142c, and the read motion information is read. The motion compensation unit 142g is provided. The motion information may include a motion vector indicating a motion size from a reference frame of blocks constituting the current frame, a frame number of the reference frame, and the like.

Such frames may be classified into intra frames that can be decoded without reference to other frames (reference frames) and inter frames that can be decoded with reference to other frames. In the MPEG codec, an I frame corresponds to an intra frame, and a P frame and a B frame correspond to an inter frame.

On the other hand, the frame reading unit 142b transmits an 'intra frame notification signal' to the controller 190 when the first intra frame appears after the channel switching. The intra frame notification signal may simply be represented by 1 bit, where 1 may correspond to the intra frame notification signal, and 0 may indicate that it is not.

The inverse quantizer 142c inverse quantizes the texture information transmitted from the variable length decoder 142a and outputs a transform coefficient. The inverse quantization process is a process of finding a quantized coefficient matched with a value represented by a predetermined index in the video encoder stage. A table indicating a matching relationship between the index and the quantization coefficients may be passed from the video encoder stage or may be previously promised between the encoder and the decoder.

The inverse spatial transform unit 142d performs the inverse of the spatial transform method performed by the encoder stage, and inversely transforms the transform coefficients into transform coefficients in the spatial domain. The spatial transform method includes a DCT (Discrete Cosine Transform) transform method and a wavelet transform method.

If the current frame is an intra frame, the original video image is directly restored through the inverse spatial transform unit 142d. Therefore, the original frame is directly output to the display unit 150. However, if the current frame is an inter frame, the motion compensation unit 142g is configured. By adding the motion compensation frame, the original video image is reconstructed and output to the display unit 150.

The motion compensator 142g generates a motion compensated frame by reconstructing a reference frame that is already reconstructed and stored in the frame memory 142f using the provided motion information.

In this case, the display unit 150 for displaying the image may be implemented by various display modules such as a liquid crystal display (LCD), a plasma display panel (PDP), an electro luminescent display (ELD), and a vacuum fluorescent display (VFD).

The additional information extracting unit 160 extracts and decodes service information such as program specific information (PSI) included in the received broadcast signal. That is, the additional information extractor 160 receives and decodes the separated PSI section, the program and service information protocol (PSIP) section, or the DVB SI (service information) section through the demultiplexer 130.

In addition, the additional information extraction unit 160 decodes the received sections to create a database of additional information, and the database of the additional information is stored in the storage unit 180. In addition, the storage unit 180 may store the received video signal and audio signal in addition to the additional information. In this case, a hard disk drive (HDD) or the like capable of storing a large amount of data may be used as the storage unit 180.

The CM (Channel Manager) unit 170 creates a channel map. In addition, the control unit 190 receives a control signal according to a command input from a user, and selects a channel to receive using the channel map. The CM unit 170 receives additional information of a channel from the additional information extractor 160 and sets the demultiplexer 130 to set an audio / video PID (packet identifier) of the selected channel.

In particular, the CM unit 170 receives additional information of a corresponding channel provided through the additional information extracting unit 160 to construct the channel map, and uses the received additional information to receive the additional information about the channel. Configure channel information. In this case, the configured channel information may include a physical CH number, a source ID, a virtual CH number, a virtual short name, a video PID, an audio PID, and the like.

That is, in the case of digital broadcasting, video and audio data are compressed into digital information, and system information and program information are compressed according to the Program and System Information Protocol (PSIP) standard to generate a data stream together with the compressed video and audio data. And may be transmitted to the broadcast reception device.

The PSIP is a standard for terrestrial and cable digital broadcasting that defines program and system information standards. The PSIP parses signals encoded according to the Moving Picture Experts Group (MPEG) standard and provides various information about a program. It is defined to do so.

On the other hand, the data stream received from a digital broadcasting center, for example, a broadcasting station, is a service information (SI), and a service description table (SDT), a program association table (PAT), and a program map table. (PMT, Program Map Table) may be included.

The broadcast information table (SDT) may include broadcast service channels of the media channel currently being broadcast and information on the channels, and by referring to the broadcast information table (SDT), a user searches for a channel and a desired channel. Can be selected.

At this time, the CM unit 170 is a Program Association Table (PAT) / Program Map Table (PMT) / Master Guide Table (MGT) / Terrestrial Virtual Channel Table (TVCT) _ / CVCT (CVCT) included in the additional information Table) is used to configure channel information about the channel.

That is, the broadcast information table SDT may include broadcast service channels of the media channel currently being broadcast and information about the channels. The user may search for a channel by referring to the broadcast information table SDT. You can select the channel you want.

In addition, the program association table (PAT) is a packet ID (PID) of the program map table (PMT) having a broadcast channel ID (ID) currently being broadcast and additional information about the broadcast channel, that is, the broadcast channel's PMT PID may be included.

The program map table PMT may include a packet ID (PID) of each broadcast channel, that is, a video and audio data stream corresponding to the PMT PID.

In this case, the additional information extraction unit 160 may extract a program association table (PAT) and a program map table (PMT) from the additional information.

In addition, the CM unit 170 constructs a channel map having information on channels currently being broadcast using the extracted additional information.

As described above, the configured channel map may include a physical CH number, a source ID, a virtual CH number, a virtual short name, a video PID, an audio PID, and the like for each channel.

That is, when an automatic channel search command is input from the user, the tuner unit 110 receives a broadcast signal corresponding to each channel. In this case, when the received broadcast signal is present, the tuner unit 110 is locked, and accordingly, the additional information extractor 160 extracts additional information from the received broadcast signal and performs a CM unit. (170).

The CM unit 170 configures channel information on the corresponding channel using the extracted additional information, and creates a channel map using the configured channel information. In conclusion, since the additional information is used in constructing a channel map, channels registered in the channel map are channels in which the additional information exists, and channels in which the additional information is not detected are not registered in the channel map. .

However, although a valid broadcast signal exists in a specific channel according to a broadcast signal reception environment, additional information may not be extracted from the broadcast signal. However, since no additional information is extracted from the channel, the channel is not registered in the channel map.

Accordingly, in the present invention, arbitrary channel information is configured for the channel in which the broadcast signal exists, that is, the channel in which the tuner unit 110 is locked, and is temporarily registered in the channel map.

The controller 190 controls the overall operation of the broadcast reception device. In particular, the controller 190 receives a specific key input from the user and controls the operation of the broadcast receiving apparatus according to the input. For example, upon receiving a key input related to channel selection from a user, the channel selection signal according to the input key is transmitted to the CM unit 170.

In addition, during the automatic channel search, the controller 190 allows channel information of a corresponding channel to be registered in the channel map based on arbitrary channel information even for a channel for which additional information is not extracted.

Hereinafter, the channel map configuration process of the CM unit 170 will be described in more detail.

In the automatic channel search, the tuner 110 sequentially receives and outputs a broadcast signal for each channel.

At this time, the CM unit 170 receives the lock result of the tuner unit 110 and determines that the actual broadcast signal (not known whether the validity) exists only for the locked channel, thereby receiving the received broadcast signal. Allow additional information to be extracted from

If additional information is extracted from the broadcast signal, the CM unit 170 configures channel information on the channel by using the extracted additional information, registers the configured channel information in a channel map, You will go through the general process of creating a map.

However, the CM unit 170 configures arbitrary channel information for a channel from which the additional information is not extracted in consideration of a reception environment of a broadcast signal, and thus registers the configured channel information in the channel map.

Here, a channel registered in the channel map among the channels from which the additional information is not extracted is determined according to the lock result of the tuner 110. That is, the CM unit 170 generates arbitrary channel information on the channel where the tuner unit 110 is locked but additional information is not extracted, and registers the channel information in the channel map. In this case, the arbitrary channel information is physical channel information for the corresponding channel. Hereinafter, a channel in which the tuner unit 110 is locked but no additional information is extracted will be described as a 'first channel'.

That is, the CM unit 170 registers the physical channel number information for selecting the first channel in the channel map, so that the channel can be switched to the first channel at a later channel switching.

In addition, the CM unit 170 periodically requests the additional information extraction unit 160 for additional information on the first channel, and uses the additional information transmitted according to the request to complete the channel for the first channel. Organize information.

In this case, the period for requesting the additional information may be arbitrarily set by the user, but the period is preferably a time point at which a channel switching event to the first channel occurs.

That is, the CM unit 170 transmits the additional information request signal for the first channel to the additional information extracting unit 160 every time a channel switching event to the first channel occurs. In this case, the broadcast signal for the first channel may be received based on the randomly generated physical channel number information.

The additional information extracting unit 120 extracts additional information from the broadcast signal of the first channel received through the tuner unit 110 and extracts the additional information to the CM unit 160 according to whether the extracted additional information exists. Deliver additional information or a message informing that the additional information does not exist.

When the additional information about the first channel is transmitted from the additional information extracting unit 120, the CM unit 170 uses the additional information to replace a complete channel information for the first channel. Generate information. That is, the CM unit 170 deletes any channel information on the first channel previously registered in the channel map when the additional information is delivered. The CM unit 170 configures channel information on the first channel by using the transmitted additional information, and registers the configured channel information in the channel map.

In addition, when the channel information is configured, the CM unit 170 uses the configured channel information to input the PID for the first channel to the demultiplexer 130 so as to switch to the first channel. Set it.

On the other hand, the CM unit 170, if a message indicating that the additional information of the first channel does not exist from the additional information extracting unit 160, once the channel switching to the first channel is not made (Skip the first channel), thereby controlling channel switching to the next channel.

In addition, the CM unit 170 determines whether to delete the channel information of the first channel on the channel map according to a preset condition. Here, the condition may be set to any one of the number of channel switching and the elapsed time.

That is, the CM unit 170 increases the number of channel switching of the first channel once when the additional information of the first channel is not transmitted. The channel number of times of switching the first channel, which has been increased once, is checked. If the number of times of switching is out of a predetermined condition, the channel information of the first channel is deleted from the channel map. Here, the deleted channel information is physical channel number information of the randomly generated first channel.

For example, when the set condition is '5 times of channel switching', the CM unit 170 checks the number of channel switching of the increased first channel. If the checked number of channel switching exceeds five times, the channel information of the first channel is deleted from the channel map. In addition, the CM unit 170 stores the increased number of channel switching in the storage unit 180 when the checked number of channel switching does not exceed five times, and then stores channel information of the first channel in the channel map. Keep it on.

In addition, when the set condition is 'one month of elapsed time', the CM unit 170 checks how much time has elapsed since the channel information of the first channel is registered in the channel map. When the checked elapsed time exceeds the set elapsed time, the CM unit 170 deletes the channel information of the first channel from the channel map. In addition, the CM unit 170 maintains the channel information of the first channel if the checked elapsed time does not exceed the set elapsed time.

As described above, according to the broadcast receiving apparatus according to an embodiment of the present invention, a channel for which additional information is not normally received due to a broadcast receiving environment is stored in a channel map for a predetermined time, and thus, at a time when the broadcast receiving environment is normally changed. By reconfiguring normal channel information for the channel, it is possible to improve channel reception capability in various broadcast reception environments.

5 is a flowchart illustrating a step-by-step method of configuring a channel map of a broadcast reception device according to an embodiment of the present invention.

Referring to FIG. 5, the method for constructing a channel map first determines whether an automatic channel search execution command is input (step 101). The automatic channel search execution command may be input through a remote controller or the like, and if there is a key input corresponding to the automatic channel search execution, the controller 190 transmits a key input signal corresponding thereto to the CM unit 170.

When the key input signal corresponding to the automatic channel search is transmitted, the CM unit 170 selects a channel to search (step 102). The selected channel may be the first channel located on the basis of the frequency band or may be the next channel of the previously searched channel.

The tuner 110 receives the broadcast signal of the selected channel through the CM unit 170 and transmits a signal corresponding to the reception result of the broadcast signal to the CM unit 170 (step 103). Here, the transmitted signal is whether the tuner 110 is locked according to the presence or absence of the broadcast signal.

The CM unit 170 analyzes the signal transmitted from the tuner unit 110 and determines whether a broadcast signal exists in the selected channel (step 104). In other words, it is determined whether the tuner 110 is locked.

If the tuner 110 is locked, the CM unit 170 extracts additional information from the received broadcast signal through the additional information extracting unit 160. Accordingly, the additional information extracting unit 160 extracts additional information necessary for constructing a channel map from the received broadcast signal (step 105). Here, the extracted additional information may include PAT / PMT / MGT / TVCT / CVCT.

The additional information extracting unit 160 transmits a signal according to the extraction result of the additional information to the CM unit 170. That is, if the additional information is extracted, the additional information extraction unit 160 transmits the extracted additional information to the CM unit 170. In addition, if the additional information is not extracted, the additional information extraction unit 160 transmits a message indicating that the additional information is not extracted to the CM unit 170.

The CM unit 170 checks whether the additional information has been delivered from the additional information extracting unit 160 or whether a message for not extracting additional information has been delivered (step 106).

If the additional information is transmitted from the additional information extracting unit 160, the CM unit 170 configures channel information on the selected channel using the transferred additional information (step 107). The channel information may include a physical CH number, a source ID, a virtual CH number, a virtual short name, a video PID, an audio PID, and the like. In other words, the extracted additional information includes information necessary for configuring the channel information.

In addition, the CM unit 170 registers the configured channel information in the channel map (step 109).

On the other hand, the CM unit 170 configures arbitrary channel information for the selected channel, if a message indicating that the additional information is not extracted from the additional information extraction unit 160 is transmitted (step 108). In this case, the configured arbitrary channel information includes physical channel number information for tuning the channel. In addition, the physical channel number information may also include frequency band information for the channel.

Subsequently, the CM unit 170 determines whether the search for all channels is completed, and if the search for all channels is completed, terminates, or returns to step 102 and searches for the next channel. Continue to perform (step 110).

6 is a flowchart for explaining a broadcast reception method of the broadcast reception device according to an embodiment of the present invention step by step.

Referring to FIG. 6, the broadcast reception method first determines whether a channel switching event has occurred from a user (step 201). In this case, the channel switching event may be generated by inputting a number key corresponding to a specific channel number, or may be generated by inputting a channel up key or a channel down key.

If the channel switching event occurs, the CM unit 170 checks the channel to be switched by the user (step 202). Confirmation of the switching channel can be confirmed through a channel map. That is, if a channel up key is input in a state where CH6, CH7, CH8, and CH9 are stored in the channel map and are currently receiving CH6, the switching channel will be CH7.

When the switching channel is identified, the CM unit 170 checks channel information on the switching channel on a channel map, and accordingly, whether the channel information is complete channel information (normal channel information) or incomplete channel information (abnormal) Channel information) (step 203). That is, it is determined whether channel information on the channel is configured by additional information or arbitrarily.

If the channel information on the channel is normal channel information, the CM unit 170 reads the channel information of the switching channel existing on the channel map, and uses the read channel information to convert the user to the channel information. Switching to the channel is made (step 204).

In addition, if the channel information on the channel is abnormal channel information, the CM unit 170 reads channel information (arbitrary channel information) of the switching channel existing on the channel map, and accordingly, The request signal is transmitted to the tuner unit 110 and the additional information extraction unit 160 so that the broadcast signal is received to extract additional information (step 205).

The CM unit 170 deletes the channel information of the switching channel registered in the channel map when the additional information on the switching channel is transmitted from the additional information extracting unit 160 according to the request signal (step 206). (Step 207). That is, any channel information about the switching channel configured to register the switching channel to the channel map during the channel search is deleted on the channel map.

The CM unit 170 configures channel information on the switching channel by using the additional information of the switching channel transferred from the additional information extracting unit 160 (step 208).

The CM unit 170 registers the channel information on the configured conversion channel in the channel map (step 209).

In addition, the CM unit 170 switches to the channel to be switched by the user using the channel information registered in the channel map (step 210).

Meanwhile, if the additional information is not transmitted from the additional information extracting unit 160, the CM unit 170 enters step A.

Hereinafter, the step A will be described in more detail.

7 is a flowchart of step A of FIG. 6 according to the first embodiment of the present invention.

Referring to FIG. 7, in step A of FIG. 6, if additional information on the switching channel is not transmitted first, the CM unit 170 increases the number of channel switching of the channel once (step 301).

The CM unit 170 checks the increased number of channel switching, and accordingly, compares the checked number of channel switching with a preset number of channel switching (step 302).

As a result of the comparison, the CM unit 170 determines whether the checked number of channel switching exceeds the set number of channel switching (step 303).

The CM unit 170 deletes the channel information of the channel registered on the channel map if the checked number of channel switching exceeds the set number of channel switching (step 304). That is, the channel information of the arbitrarily configured switching channel is deleted from the channel map (step 304).

The CM unit 170 performs channel switching to the next channel of the switching channel using the channel map (step 307).

On the other hand, the CM unit 170 maintains the channel information of the switching channel registered on the channel map as it is, if the checked number of channel switching does not exceed the set number of channel switching (step 305).

In addition, the CM unit 170 stores the number of channel switching for the switching channel in the storage unit 180 (step 306), and enters the step (307).

8 is a flowchart of step A of FIG. 6 according to the second embodiment of the present invention.

Referring to FIG. 8, in step A of FIG. 6, if additional information of the switching channel is not transmitted first, the CM unit 170 checks the elapsed time from the registration date when the switching channel is registered in the channel map to the present time. (Step 401). That is, the CM unit 170 checks the channel map registration date and the current date of the switching channel and accordingly checks the elapsed date according to the difference between the two periods.

The CM unit 170 determines whether the checked elapsed time has passed a predetermined elapsed time (step 402).

If the checked elapsed time exceeds the set elapsed time, the CM unit 170 deletes channel information of the channel registered on the channel map (step 403). That is, the channel information of the switching channel configured arbitrarily is deleted from the channel map.

In addition, if the checked elapsed time does not exceed the set elapsed time, the CM unit 170 maintains channel information of the switching channel registered on the channel map as it is (step 404).

The CM unit 170 performs channel switching to the next channel of the switching channel by using the channel map (step 405).

As described above, according to the broadcast reception method of the broadcast reception device according to the present invention, a channel map is stored for a predetermined time even for a channel for which additional information is not normally received due to the broadcast reception environment, and accordingly the broadcast reception environment is changed normally. By reconstructing normal channel information on the channel at a time point, the channel reception capability in various broadcast reception environments can be improved.

The above description is merely illustrative of the technical idea of the present invention, and those skilled in the art to which the present invention pertains may make various modifications and variations without departing from the essential characteristics of the present invention. Therefore, the embodiments disclosed in the present invention are not intended to limit the technical idea of the present invention but to describe the present invention, and the scope of the technical idea of the present invention is not limited by these embodiments. The protection scope of the present invention should be interpreted by the following claims, and all technical ideas within the scope equivalent thereto should be construed as being included in the scope of the present invention.

1 is a diagram illustrating a configuration of a broadcast receiving apparatus according to an embodiment of the present invention.

FIG. 2 is a diagram illustrating a detailed configuration of the tuner unit and the digital demodulation unit of FIG. 1. FIG.

3 is a diagram illustrating a detailed configuration of a symbol recovery unit of FIG. 2.

4 is a diagram illustrating a detailed configuration of an image processor of FIG. 1.

5 is a flowchart illustrating a step-by-step method of configuring a channel map of a broadcast reception device according to an embodiment of the present invention.

6 is a flowchart for explaining a broadcast reception method of the broadcast reception device according to an embodiment of the present invention step by step.

7 is a flow chart for step A of FIG. 6 according to the first embodiment of the present invention.

8 is a flow chart for step A of FIG. 6 according to the second embodiment of the present invention.

Claims (19)

Receiving a broadcast signal corresponding to a first channel according to channel search execution; Extracting additional information included in the broadcast signal according to the presence or absence of a broadcast signal provided through the first channel; If the extracted additional information does not exist, configuring arbitrary channel information for the first channel; And, And registering the channel information of the configured first channel in a channel map. The method of claim 1, The arbitrary channel information is a broadcast reception method, characterized in that the physical channel number of the first channel. The method of claim 1, And if the extracted additional information exists, constructing channel information for the first channel based on the additional information and registering the extracted additional information in a channel map. The method of claim 1, And periodically extracting additional information included in the broadcast signal of the first channel using any channel information registered in the channel map. The method of claim 4, wherein The period is a broadcast reception method, characterized in that the time when the channel switching event to the first channel occurs. The method of claim 4, wherein If additional information is extracted from the broadcast signal received based on the arbitrary channel information, using the additional information, configuring the channel information to replace any channel information registered in the channel map, further comprising: The configured channel information is registered in the channel map by substituting the arbitrary channel information. The method of claim 4, wherein And if additional information is not extracted from the broadcast signal received based on the arbitrary channel information, performing channel switching to a next channel. The method of claim 7, wherein And if the additional information is not extracted from the broadcast signal of the first channel during a preset condition, deleting any channel information registered in the channel map. The method of claim 8, The condition is a broadcast receiving method, characterized in that at least one of the number of channel switching and the elapsed registration time. A broadcast signal receiver for receiving a broadcast signal; An additional information extracting unit which extracts additional information from the received broadcast signal; A CM (Channel Manager) unit configured to configure channel information by using the extracted additional information and to configure a channel map by registering the configured channel information in a channel map; A storage unit for storing a channel map configured through the CM unit; And, And a control unit configured to control a channel map based on the additional information, and to control a channel to be registered in the channel map based on arbitrary channel information with respect to a channel in which the additional information does not exist. Broadcast receiving device. The method of claim 10, And the arbitrary channel information is physical channel number information. The method of claim 10, And a channel registered in the channel map on the basis of the arbitrary channel information is a channel locked through the broadcast signal receiving unit. The method of claim 10, And the CM unit requests additional information about a channel registered in the channel map on the basis of the arbitrary channel information at regular intervals. The method of claim 13, The request period is a broadcast receiving device, characterized in that the time when a channel switching event to the channel occurs. 15. The method of claim 14, And the CM unit determines whether to switch to the channel according to whether to transmit the requested additional information when the channel change event to the channel occurs. The method of claim 15, The CM unit, when the requested additional information is transmitted, configures channel information to replace the arbitrary channel information based on the additional information, and performs channel switching according to the configured channel information. The method of claim 15, And the CM unit performs channel switching to the next channel of the channel if the additional information of the channel is not transmitted. The method of claim 15, And when the additional information of the channel is not transmitted, the CM unit deletes any channel information of the channel from a channel map according to a preset condition. The method of claim 18, The condition corresponds to at least one of the number of channel switching and the elapsed registration time.

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