KR100765769B1 - Broadcasting receiver and method for fast searching digital multimedia broadcasting channel - Google Patents

Abstract

The present invention relates to a broadcast receiving apparatus and method for reducing a channel search time by searching a digital multimedia broadcasting channel at high speed. According to an aspect of the present invention, there is provided a broadcast receiving apparatus for fast searching of a digital multimedia broadcasting channel, comprising: a tuner unit configured to output one digital multimedia broadcasting signal among a plurality of digital multimedia broadcasting signals received by tuning one channel among a plurality of channels; A broadcast signal processor configured to process an output digital multimedia broadcasting signal and to interpret information about the number of services included in the digital multimedia broadcasting signal; Count the number of services included in the digital multimedia broadcasting signal, compare the number of services included in the analyzed information with the counted services, and control the tuner unit according to the comparison result to control scanning of the digital multimedia broadcasting signal. It includes a control unit. According to the present invention, a digital multimedia broadcasting channel can be searched at high speed.

Digital multimedia broadcasting, scanning, number of services, FIC, FIG

Description

Broadcasting receiver and method for fast searching digital multimedia broadcasting channel

1 is a block diagram showing the configuration of a broadcast receiving apparatus for fast searching of a digital multimedia broadcasting channel according to an embodiment of the present invention.

2 is a block diagram illustrating a configuration of the broadcast signal processor 130 of FIG. 1 according to an embodiment of the present invention.

3 is a diagram illustrating multiple structures of a DMB service according to an embodiment of the present invention.

4 illustrates the structure of a DMB transmission frame.

5 is a diagram illustrating a configuration of a fast information block (FIB).

6 is a diagram illustrating a list of FIG types according to one embodiment of the present invention;

7 is a diagram illustrating a FIG structure including information on the number of services according to an embodiment of the present invention.

8 is a flowchart illustrating a fast search method of a digital multimedia broadcasting channel according to an embodiment of the present invention.

The present invention relates to a digital multimedia broadcasting receiving apparatus and method, and more particularly, to a broadcast receiving apparatus and method for reducing the channel search time by searching a digital multimedia broadcasting channel at high speed.

Digital Audio Broadcasting (DAB) uses the latest audio encoding method with high compression rate, and provides various additional data services such as weather, traffic, entertainment, and video as well as high quality audio service at CD level. A more advanced form of digital broadcasting in DAB is Digital Multimedia Broadcasting (DMB). DMB provides audio, video and data broadcasting.

When a broadcast receiving device receiving such a digital multimedia broadcast searches for a broadcast channel, since there is no information on how long the broadcast channel should be searched for, the broadcast receiving device usually sets a predetermined time, for example, 3 seconds or 5 seconds. The broadcast channel will be searched for seconds. In this case, even when the broadcast channel search is completed, the channel may be searched repeatedly. In addition, when a broadcast service provider provides a plurality of services through a single broadcast channel, when a service is divided and transmitted, the search operation is stopped even when the broadcast channel search is not completed.

SUMMARY OF THE INVENTION The present invention has been made in an effort to solve the above problems, and provides a broadcast receiving apparatus and method capable of searching a digital multimedia broadcasting channel at a high speed by determining a time point at which a search for a broadcasting channel is completed. There is.

In order to achieve the above technical problem, the broadcast receiving apparatus for the high-speed search of the digital multimedia broadcasting channel according to an aspect of the present invention, the plurality of digital multimedia broadcast signal received by tuning one of the plurality of channels A tuner unit for outputting one digital multimedia broadcasting signal; A broadcast signal processor configured to process an output digital multimedia broadcasting signal and to interpret information about the number of services included in the digital multimedia broadcasting signal; Count the number of services included in the digital multimedia broadcasting signal, compare the number of services included in the analyzed information with the counted services, and control the tuner unit according to the comparison result to control scanning of the digital multimedia broadcasting signal. It includes a control unit.

Preferably, the control unit, if the number of services included in the interpreted information does not match the number of counted services, the tuner to continue scanning until the number of services included in the analyzed information until the number of services included in the interpreted information The control unit controls the tuner unit to stop scanning when the number of services included in the analyzed information and the number of counted services match.

Preferably, the broadcast reception device according to an embodiment of the present invention further includes a memory for storing information on the number of analyzed services, and the control unit includes the number of services included in the stored information and the number of counted services. Compare and control the tuner unit according to the comparison result to control the scanning of the digital multimedia broadcasting signal.

Preferably, if the information on the number of services interpreted from the received digital multimedia broadcasting signal does not match the information stored in the memory, the controller updates the information stored in the memory with information on the number of services interpreted.

According to another aspect of the present invention, a method for searching a digital multimedia broadcasting channel at high speed includes: analyzing information on the number of services included in a received digital multimedia broadcasting signal; Counting the number of services included in the digital multimedia broadcasting signal; Comparing information about the number of analyzed services with the number of counted services; And controlling scanning of the digital multimedia broadcasting signal according to the comparison result.

1 is a block diagram illustrating a configuration of a broadcast receiving apparatus for fast searching of a digital multimedia broadcasting channel according to an embodiment of the present invention. The broadcast reception device according to an embodiment of the present invention includes an antenna 110, a tuner unit 120, a broadcast signal processor 130, a controller 140, and a memory 150.

The tuner unit 120 outputs one digital multimedia broadcasting signal among a plurality of digital multimedia broadcasting signals received by the antenna 110 by tuning one channel among the plurality of channels.

The broadcast signal processing unit 130 receives the digital multimedia broadcasting signal output from the tuner unit 120, demodulates and / or decodes it, outputs it to an output device (not shown), analyzes the received digital multimedia broadcasting signal, and ensemble the ensemble. Interpret information about the number of services included in the

2 is a block diagram illustrating a configuration of the broadcast signal processor 130 of FIG. 1 according to an embodiment of the present invention. 2, the broadcast signal processor 130 includes a channel decoder 131, a demultiplexer 132, a decoder 133, and an FIC parser 134. The channel decoder 131 performs channel decoding according to a predetermined scheme, and the demultiplexer 132 demultiplexes the channel decoded signal to transfer the DMB transmission frame 400 as shown in FIG. 4 to the decoder 133. Output The demultiplexer 132 interprets the FIC 430 from the DMB transmission frame 400 and outputs the FIC 430 to the FIC parser 134.

The FIC parser 134 parses the FIC 430 and provides information about the number of services included in the ensemble to the controller 140. Since the broadcast service provider may include information on the number of services in the FIG structure as shown in FIG. 7 and transmit the information, the FIC parser 134 may interpret the information on the number of services. In addition, the FIC parser 134 may interpret label information for each service by interpreting the FIC.

The decoder 133 decodes the DMB transmission frame 400 and provides the decoded signal to an output device (not shown) such as a speaker. The decoder 133 may comprise a plurality of decoding means. That is, it may include a plurality of audio decoding means, video decoding means and the like.

Referring back to FIG. 1, the controller 140 may count the number of services included in the digital multimedia broadcasting signal. To this end, the controller 140 may store the service-specific label information included in the currently scanned ensemble interpreted by the FIC parser 134 in the memory 150 by increasing the count by one. Accordingly, the controller 140 compares the counted number of services obtained by counting the number of services included in the currently scanned ensemble with the number of services included in the information obtained by analyzing the FIC, and according to the comparison result, the digital multimedia broadcasting. The tuner 120 may be controlled to control scanning of the signal.

If the number of services included in the analyzed information and the number of counted services match, the controller 140 may control the tuner 120 to stop scanning, and the number and count of services included in the analyzed information may be counted. If the number of services does not match, the tuner 120 may be controlled to perform scanning based on the number of services. More specifically, the controller 140 may control the tuner 120 to continue scanning until the counted number of services becomes the number of services included in the analyzed information. For example, when the number of services identified by interpreting an FIC including information on the number of broadcast services is 3 and the number of services counted by processing a broadcast signal is 2, the controller 140 controls the remaining one. The tuner 120 may be controlled to scan more services.

The memory 150 stores information about the number of analyzed services. The memory 150 may be configured in the controller 140. When the number information on the service is not transmitted to the FIC through the current ensemble, the controller 140 may compare the number of services included in the ensemble stored in the memory 150 with the number of services currently counted. In addition, if the information about the number of services interpreted from the received digital multimedia broadcasting signal does not match the information stored in the memory 150, the controller 140 may update the stored information with information about the number of services to be interpreted. have. Accordingly, the broadcast reception device 100 may perform channel search using the updated information.

Meanwhile, the broadcast reception device 100 according to an embodiment of the present invention includes two or more tuner units 120 to provide a user with a broadcast service for one ensemble, and to provide the number of broadcast services for another ensemble. Information can be interpreted and updated. Alternatively, the broadcast reception device 100 may interpret and update information on the number of broadcast services by interpreting a digital multimedia broadcast signal while operating in another operation mode such as video or audio playback.

3 is a diagram illustrating a multiple structure of a DMB service according to an embodiment of the present invention. Referring to FIG. 3, a multiplex structure of a DMB service according to an embodiment of the present invention has an ensemble, a service, and a service component.

Ensemble refers to a plurality of encoded audio streams and a plurality of data each being channel coded and then multiplexed into one bit stream together with system data. It is common for one station to provide one ensemble. A service refers to an output selected by a user, such as a program service or a data service, and a service component refers to elements constituting a service. The DMB service according to the present embodiment may include at least two ensembles including ENSEMBLE # 0 310 and ENSEMBLE # 1 315. ENSEMBLE # 0 310 may provide at least two services including Service # 0 330 and Service # 1 335. Service # 0 330 may again include at least two service elements, including Service Component # 0 350 and Service Component # 1 355.

4 is a diagram illustrating the structure of a DMB transmission frame.

The DMB transmission frame is composed of a synchronization channel (SC) 410, a fast information channel (FIC) 420, and a main service channel (MSC) 430. The synchronization channel (SC) 410 is composed of a null symbol capable of determining a transmission mode, and reference symbols required for OFDM symbol synchronization and carrier frequency synchronization.

The fast information channel (FIC) 420 transmits information necessary for a receiver to process data, for example, information on a service configuration, a multiplexed form, and the like, or transmits data that needs to be transmitted quickly. The channel used. The FIC 420 includes multiplexing configuration information (MCI) including information on the structure of each subchannel, and service information (SI) which is additional information about each service. So checking this channel will tell you which service's data is being sent through the MSC and by which application the service will be used. The fast information block (FIB) constituting the FIC 420 will be described later with reference to FIG. 5. The main service channel (MSC) 430 transmits actual content data provided by the service provider.

5 is a diagram illustrating a configuration of a fast information block (FIB).

The FIC consists of FIBs and each FIB consists of an FIB data field 510 and a CRC field 520. The FIB data field 510 is 30 bytes, which in turn consists of FIGs. If the FIB data field 510 cannot be filled with the FIG data, 256 bits are padded by padding the null data 540 after inserting the end marker 530 so that the receiver knows that the FIG data is no longer present. Create a FIB of size. Each FIG includes a FIG type field 550 indicating the format of data contained in the FIG data field 570 and a length field 560 indicating the length of the FIG data field 570, followed by actual data. Is contained in the FIG data field 570. The syntax of the information or data about the FIG type depends on the application used or the information to be informed.

6 is a diagram illustrating a list of FIG types according to an embodiment of the present invention.

As shown in FIG. 6, when FIG type number is 0, it is used to signal information about a part of MCI and SI, and when FIG type number is 1, label for display and other information defining a label are shown. It is used to signal. If the FIG type number is 2 to 4, it is a reserved area and may be used to signal information about the number of services proposed by the present invention.

If the FIG type number is 5, it is used for FIDC; if the FIG type number is 6, it is used for CA (Conditional Access); if the FIG type number is 7, DSCTy (Data Service Component Type) table Used for additional information about service elements for types not included in. Information about the number of services proposed by the present invention by the broadcast service provider may be provided in a region including FIG type numbers 0, 1, and 5-7.

7 is a diagram illustrating a FIG structure including information on the number of services according to an embodiment of the present invention. According to an embodiment of the present invention, when the type number is 2, as shown in FIG. 7, a field including information on the number of services may be defined and used in the header part of FIG type 2 instead of the length field. Accordingly, the broadcast reception device according to an embodiment of the present invention may know in advance information about the number of services included in the ensemble and transmitted by analyzing the header portion of FIG. Accordingly, the broadcast receiving apparatus may stop scanning when the number of services counted by processing the digital multimedia broadcasting signal matches the number of services included in the information, thereby reducing the broadcast channel search time.

8 is a flowchart illustrating a fast searching method of a digital multimedia broadcasting channel according to an embodiment of the present invention.

In order to perform a fast search method of a digital multimedia broadcasting channel according to an embodiment of the present invention, first, information about the number of services included in a received digital multimedia broadcasting signal is analyzed (S810). Then, the number of services included in the digital multimedia broadcasting signal is counted (S820). The number of services included in the analyzed information is compared with the number of counted services (S830). The scanning of the digital multimedia broadcasting signal is controlled according to the comparison result (S840).

The high speed search method of a digital multimedia broadcasting channel according to the present invention may be implemented as computer readable codes on a computer readable recording medium. Codes and code segments implementing the above program can be easily deduced by computer programmers in the art. Computer-readable recording media include all types of recording devices that store data that can be read by a computer system. Examples of computer-readable recording media include ROM, RAM, CD-ROM, magnetic tape, floppy disk, optical disk, and the like, and may also include those implemented in the form of carrier waves (eg, transmission over the Internet). do. The computer readable recording medium can also be distributed over network coupled computer systems so that the computer readable code is stored and executed in a distributed fashion.

The above description is only one embodiment of the present invention, and those skilled in the art may implement the present invention in a modified form without departing from the essential characteristics of the present invention. Therefore, the scope of the present invention should not be limited to the above-described examples, but should be construed to include various embodiments within the scope equivalent to those described in the claims.

As described above, according to the present invention, a transmitting side for transmitting a broadcast signal provides information on the number of services, and the broadcast receiving device can search for a broadcast channel at high speed by using information about the number of services. An apparatus and method can be provided.

Therefore, the broadcast receiving apparatus according to the present invention can stop scanning when the number of services counted by processing the digital multimedia broadcasting signal matches the information on the number of services included in the FIC, so that the broadcast channel can be searched at high speed. have.

Claims (5)

A broadcast receiving device for fast searching of a digital multimedia broadcasting channel, A tuner unit for outputting one digital multimedia broadcasting signal among a plurality of digital multimedia broadcasting signals received by tuning one channel among a plurality of channels; A broadcast signal processor configured to process the output digital multimedia broadcast signal and to interpret information about the number of services included in the digital multimedia broadcast signal; The number of services included in the digital multimedia broadcasting signal is counted, the number of services included in the interpreted information is compared with the counted services, and the tuner is controlled according to the comparison result to control the digital multimedia broadcasting. And a control unit for controlling scanning of the signal. The method of claim 1, If the number of services included in the analyzed information does not match the number of counted services, the controller continues the scanning until the counted services is the number of services included in the analyzed information. To control the tuner unit, And adjusting the tuner unit to stop scanning when the number of services included in the analyzed information and the counted number of services match. The method of claim 1, Further comprising a memory for storing information on the number of the analyzed service, The controller may compare the number of services included in the stored information with the counted number of services, and control the scanning of the digital multimedia broadcasting signal by controlling the tuner according to the comparison result. Receiving device. The method of claim 3, wherein the control unit, If the information on the number of services interpreted from the digital multimedia broadcasting signal does not match the information stored in the memory, the broadcast receiving device, characterized in that for updating the information stored in the memory with information about the number of services to be interpreted. . In the method of searching for a digital multimedia broadcasting channel at high speed, Interpreting information on the number of services included in the received digital multimedia broadcasting signal; Counting the number of services included in the digital multimedia broadcasting signal; Comparing the number of services included in the interpreted information with the counted number of services; And And controlling the scanning of the digital multimedia broadcast signal according to the comparison result.

Images