KR100753516B1 - Method for channel managing of terrestrial DMB, and terrestrial DMB receiver - Google Patents

Abstract

The present invention relates to a channel management method of a mobile broadcast and a mobile broadcast transmitter / receiver for the same. In particular, the transmitting side of the present invention assigns and transmits a unique channel number for each service, and allows the receiving side to manage channel information with the channel number. This not only enables quick channel switching but also channel switching by entering only the channel number. In addition, since channel switching is performed according to a channel number designating a broadcasting station, a user can directly switch to a desired broadcasting station by inputting only a specific number.

Virtual channel number, DMB, service

Description

Channel management method for terrestrial digital multimedia broadcasting and terrestrial digital multimedia broadcasting receiver {Method for channel managing of terrestrial DMB, and terrestrial DMB receiver}

1 illustrates a structure of a general mobile broadcast channel

2 is a view showing a part of the MCI structure of the FIC in the transmission frame of a typical mobile broadcast channel

3 is a diagram illustrating an example of a conventional mobile broadcast channel information screen.

4 (a) to 4 (c) show an example of virtual channel number allocation according to the present invention.

5 illustrates an example of a mobile broadcast channel information screen according to the present invention.

6 is an operation flowchart showing an embodiment of a channel management method for mobile broadcast according to the present invention.

7 is a block diagram showing an embodiment of a mobile broadcast receiver according to the present invention;

Explanation of symbols for main parts of the drawings

701: tuner 702: demodulator

703: DAB Decoder 704: Memory

705: first audio decoder 706: RS decoder

707: Demux 708: second audio decoder

709: Video Decoder 710: OD Decoder

711: BIFS Decoder

The present invention relates to a channel management method for terrestrial digital multimedia broadcasting and a terrestrial digital multimedia broadcasting receiver.

Recently, as digital audio devices with excellent sound quality such as CD and DVD have been rapidly spread and popularized, the demand for listeners for digital broadcasts requiring high quality sound is increasing day by day, and thus the limitation of sound quality that existing FM broadcast can provide To overcome this, Digital Audio Broadcasting (DAB) is being implemented in Europe, Canada and the United States. The DAB system uses a technology completely different from the current AM or FM broadcast to show not only high quality sound quality but also excellent reception performance on the go, and has a characteristic of transmitting digital data such as video and text at high speed. have. Recently, various multimedia services including video rather than audio broadcasting are emphasized and referred to as digital multimedia broadcasting (DMB). That is, the DMB is a digital multimedia broadcasting that provides sound quality of a CD level and data or video service, and provides excellent fixed and mobile reception quality.

In the DMB broadcast, at least one ensemble may be serviced in one physical channel frequency range.

FIG. 1 illustrates an example in which three ensembles of blocks A, B, and C are serviced in a frequency range corresponding to one channel of analog TV (eg, channel 12).

At this time, each ensemble is composed of at least one service, and each service is composed of at least one service component.

The service corresponds to one channel of TV or radio. The service element means video, audio, traffic information, or broadcast service information constituting a broadcast. The service element may be a sub channel of the main service channel (MSC) and a fast information data channel (FIDC).

In addition, there is multiplex configuration information (MCI) as information indicating what services are multiplexed in the ensemble, and what service elements constitute each service and where the service elements are located.

That is, the DMB transmission frame is composed of a synchronization channel (Fynchronization Channel), a fast information channel (FIC), and a main service channel (MSC).

The synchronization channel has a predetermined shape so that the DMB receiver recognizes the beginning of the frame, and is assigned a null symbol and a phase reference symbol (PRS).

The FIC is composed of a plurality of fast information blocks (FIBs), and is used for transmitting various information for receiving a broadcast service. In addition, the MSC is composed of one or more Common Interleaved Frames (CIFs), and is used for transmitting broadcast services such as video, audio, and data.

In other words, the FIC contains information indicating the structure of data carried in the CIF in the MSC, and each CIF contains actual data such as video data and audio data. The number of FIBs loaded on the FIC and the number of CIFs loaded on the MSC vary according to the transmission mode. For example, in transmission mode I, the FIC consists of 12 FIBs and the MSC consists of 4 CIFs. Therefore, the DMB receiver can provide video and audio services to the user by decoding the data in units of CIF.

As described above, an MCI indicating a structure between an ensemble, a service, and a service element is transmitted through an FIC, which consists of a plurality of FIBs.

Each FIB is composed of a plurality of FIG (Fast Information Group), and each FIG is divided into a FIG header and a FIG data field. In this case, the length of FIG is variable, but may not exceed 30 bytes including a header.

Table 1 below shows the types of information carried according to the FIG type.

TABLE 1

FIG type number FIG type FIG application       0   000 MCI and part of SI       One   001 Labels, etc. (part of the SI)       2   010 Reserved       3   011 Reserved       4   100 Reserved       5   101 FIC Data Channel (FIDC)       6   110 Conditional Access (CA)       7   111 In house (expert for Length 31)

In Table 1, the MCI indicating the structure of the ensemble, each service, and service element information is type 0, other SI (Service Information) is type 1, FIDC is type 5, and CA (Conditional Access) information is type 6 It is distinguished by.

That is, the MCI indicating the structure of the ensemble, each service structure, and information related to the service element is carried in type 0 of FIG in the FIC.

FIG. 2 is a diagram illustrating a structure of FIG type 0 / extension 2 of the MCI information.

2 shows information about N services, each service having a Service Id (SId), a Conditional Access Id (CAId), a number of service elements, and k service element descriptions. service component description).

In this case, the number of bits of the service identifier SId depends on whether the current service is a program service (eg, radio) or a data service (eg, TV, data).

For example, in the case of a program service, SId is 16 bits, and is composed of a 4-bit Country Id and a 12-bit Service Reference. In the case of data service, SId is 32 bits and is composed of 8 bits of ECC (Extended Country Code), 4 bits of Country Id, and 20 bits of Service Reference.

On the other hand, the current method of distinguishing each service (unique) is to use a service label (Service Label).

3 shows an example of managing a channel according to the ensemble and a service label. Among these, FIG. 3A shows corresponding channel information shown in banner form when a specific DMB channel is selected. Only an ensemble label of SBS and a service label of SBS DMB are shown without a channel number. Therefore, when changing the DMB channel, it is possible to know whether the TV mode or the radio mode, but the number that uniquely identifies the channel is unknown.

3B shows an example in which a channel list is displayed. Similarly, only an ensemble label and a service label are shown without a channel number.

In this case, the viewer can identify the broadcasting station and the service only through the label, but not through the channel number.

In this way, each DMB broadcasting channel is divided into an ensemble label and a service label without a unique channel number, and thus channel switching by numeric input cannot be performed as in analog TV or digital TV.

In particular, converting all analog TV frequencies to DMB channel frequencies results in dozens of DMB broadcasts. However, channel switching becomes inconvenient because there is no unique number for each service. In addition, in order to move to a desired channel using only the channel up / down buttons, the user has to perform a lot of key manipulations and inconveniences of waiting for a long time occurs.

In addition, in order to solve this problem, even if a preset number is assigned at the time of automatic channel setting, the preset number is changed according to a channel received at the time of automatic channel setting, and thus identity cannot be given to a specific channel. In addition, since the DMB is intended for mobile reception, there are many shaded areas, and thus, the channel received at the time of automatic setting may differ depending on the area.

That is, the preset number may be used as a number for easily changing the channel to the city / listener, but may not be used as a unique number for identifying a broadcasting station and a service.

The present invention is to solve the above problems, an object of the present invention is to assign a unique virtual channel number to each service of the DMB broadcast, a mobile type that can uniquely identify each DMB broadcast by the virtual channel number A channel management method of a broadcast and a mobile broadcast transmitter / receiver are provided.

delete

delete

delete

delete

delete

delete

delete

delete

delete

delete

delete

delete

A terrestrial digital multimedia broadcasting receiver of the present invention for achieving the above object comprises: a tuner for processing a baseband signal by performing a frequency of an ensemble including a service reference field assigned with a unique channel number of a terrestrial digital multimedia broadcasting service; A demodulator for demodulating the terrestrial digital multimedia broadcasting signal; A decoder for decoding a service reference field including channel information based on a synchronization channel in a transport frame of the demodulated broadcast signal; A control unit for generating a channel list by extracting a virtual channel number assigned to a service identifier field (SId) of each service field of the multiplex arrangement information (MCI) in a transmission frame from the decoded service reference field; A memory for storing the generated channel list and channel information; And a display unit for displaying channel information including the channel number.
In addition, the present invention provides a channel management method for terrestrial digital multimedia broadcasting comprising the steps of: receiving a terrestrial digital multimedia broadcasting signal including a service reference field assigned with a channel number for uniquely identifying the service for each program service; Decoding the service reference field from the received broadcast signal; Extracting, from the decoded service reference field, a channel number assigned to a service identifier (SId) field of each service field of FIG type 0 / extension 2 in FIG. Generating a label and a channel list of a corresponding program service based on the extracted channel number; And displaying channel information including the channel number and the corresponding program service.
The service reference field may be transmitted by assigning a unique channel number of the service to multiplexing arrangement information (MCI) in a transmission frame of a terrestrial digital multimedia broadcasting.
The unique channel number of the service is indicated and transmitted in the service identifier (SId) field of each service field of FIG type 0 / extension 2 in the multiplex configuration information (MCI).
The service reference field may be transmitted by indicating a unique channel number of the service in a service identifier field SId.
The service reference field may indicate a major channel number in the upper N bits and a minor channel number in the lower M bits and transmit the same.
The channel list is classified and stored and displayed by channel number.
Other objects, features and advantages of the present invention will become apparent from the detailed description of the embodiments with reference to the accompanying drawings.
Hereinafter, with reference to the accompanying drawings, preferred embodiments of the present invention that can specifically realize the above object will be described. At this time, the configuration and operation of the present invention shown in the drawings and described by it will be described as at least one embodiment, by which the technical spirit of the present invention and its core configuration and operation is not limited.

The DMB transmitter of the present invention allocates and transmits a unique channel number for each service, and the DMB receiver manages channel information as the channel number.

In the present invention, the unique channel number of each service is allocated to MCI and transmitted according to an embodiment.

According to an embodiment of the present invention, a virtual channel number is indicated and transmitted on a service identifier (SId) in each service information of FIG type 0 / extension 2 (FIG type 0 for extension 2).

The present invention will be described as an embodiment of displaying and transmitting a virtual channel number for identifying a DMB channel in a service reference among the service identifiers (SIds).

Referring to the service identifier (SId) field of FIG type 0 / extension 2, the service reference in the SId field of the program service is 12 bits as shown in FIG. 4A, and the service reference in the SId field of the data service is shown in FIG. 20 bits as shown in (b).

In the present invention, as shown in FIG. 4C, both the program service and the data service use only 12 bits of the service reference to indicate the virtual channel number. That is, the virtual channel number serves as an identifier for uniquely identifying the service.

According to an embodiment of the present invention, a major channel number is displayed in the upper 7 bits of the 12 bits and a minor channel number is displayed in the lower 5 bits.

In this case, the major channel number is composed of up to 128 (2 ⁷ ) and the minor channel number is composed of up to 32 (2 ⁵ ). Since analog broadcasting currently uses the frequency range 2 to 69 for airwaves and 1 to 125 for wired lines, the analog broadcasting frequency range can be specified using major channel number 7 bits. Therefore, broadcasting stations can maintain and use the channel numbers used in analog broadcasting. And because it can have up to 32 minor channel numbers, it can have 32 subchannel numbers.

For example, in case of MBC broadcasting, analog broadcasting 11 can be used as a major channel number, and since it can have 32 sub channel numbers, it is 11-0 for TV, 11-1, 11-2 for radio, etc. Can be assigned and used.

Here, the bit allocation of the major channel number and the minor channel number is one embodiment, and this may not be limited to the example described above because it may vary by a designer.

The upper 8 bits of the service reference in the service identifier (SId) field of the data service may allocate another value for identifying the data service, or may allocate a dummy bit such as 0.

5 shows an example of managing a channel according to a virtual channel number and a label according to the present invention. 5A shows the channel information shown in the form of a banner when a specific DMB channel is selected. An ensemble label of SBS and a service label of SBS DMB are shown together with a channel number of 6-0. Therefore, when changing the DMB channel, not only the TV mode or the radio mode can be known, but also the channel number for uniquely identifying the channel.

5B shows an example in which a channel list is displayed, likewise an ensemble label and a service label along with the channel number are shown on the channel list.

In this case, the viewer can identify not only the broadcasting station and the service through the label but also the channel number.

As described above, the present invention distinguishes each DMB channel by an ensemble label and a service label along with a unique channel number, so that channel switching can be performed by numerical input as in analog TV or digital TV.

FIG. 6 is an operation flowchart showing an embodiment of a method for serving a DMB broadcast using a virtual channel number according to the present invention, wherein the DMB transmitter allocates and transmits a virtual channel number to each service field of FIG. Assume

FIG. 7 is a block diagram illustrating an embodiment of a DMB receiver that receives a DMB service to which a virtual channel number is allocated and extracts and manages a virtual channel number.

7, the DMB tuner 701, the demodulator 702, the DAB decoder 703, the memory 704, the first audio decoder 705, the Reed Solomon (RS) decoder 706, and the MPEG2 demux ( 707, a second audio decoder 708, a video decoder 709, an object descriptor (OD) decoder 710, and a BIFS (Binary Format for Scenes) decoder 711. The RS decoder 706, the MPEG2 demux 707, the second audio decoder 708, the video decoder 709, the OD decoder 710, and the BIFS decoder 711 may also be referred to as a DMB decoder.

An example of managing channel information using a virtual channel number will be described with reference to FIGS. 6 and 7.

That is, the tuner 701 tunes the frequency corresponding to the ensemble including the DMB service selected by the user, lowers the baseband to the baseband, and outputs the demodulator 702. The demodulator 702 performs an inverse modulation scheme, that is, OFDM demodulation, and outputs a transmission frame composed of a synchronization channel, an FIC, and an MSC to the DAB decoder 703 (step 601).

The DAB decoder 703 decodes the FIC and the MSC with reference to the synchronization channel in the demodulated transmission frame. If the FIC is decoded, channel information, that is, an ensemble label, a service label, and a virtual channel number assigned to the service can be extracted, and a channel list is generated from the extracted channel information and stored in the memory 704.

If the MSC is decoded, the actual data can be extracted. If the extracted data is an audio signal, it is output to the first decoder 705, and if it is a data stream, it is output to the RS decoder 706 in the DMB decoder.

Next, a process of extracting channel information by decoding the FIC will be described in detail.

That is, FIG type 0 / extension 0 is parsed to extract an ensemble identifier, and FIG type 0 / extension 2 is parsed to identify a service identifier (SId) and a sub channel identifier (sub channel). Id), extract the service element type, and also extract the virtual channel number assigned to the service reference field in the service identifier (SId) (step 602). That is, the major channel number is extracted from the upper 7 bits of the service reference field, and the minor channel number is extracted from the lower 5 bits.

Then, the FIG type 1 / extension 0 is parsed to extract the ensemble label, and the FIG type 1 / extension 1 is parsed to extract the program service label. Furthermore, FIG type 1 / extension 5 is parsed to extract the data service label, FIG type 1 / extension 4 is parsed to extract the service element label (step 603).

A channel list (that is, a channel map) is generated using the channel information extracted in steps 602 and 603 and stored in the memory 704.

In one embodiment, the channel list is sorted according to a major channel number and a minor channel number, and an ensemble label and a service label are matched with each other and stored.

In this way, channel information including a channel number, an ensemble label, and a service label is displayed in the form of a banner as shown in FIG. 5A. In addition, when a channel list is requested for channel searching, a channel list including a channel number, an ensemble label, and a service label is displayed as shown in FIG. 5B. In this case, the channel can be switched to by inputting only the channel number.

Meanwhile, the first audio decoder 705 decodes and outputs the compressed and encoded audio signal using a masking pattern adapted universal sub-band integrated coding and multiplexing (MUSCAM) scheme.

The RS decoder 706 performs additional error correction on the data stream and outputs it to the MPEG2 demux 707.

The MPEG2 demux 707 performs transport stream depacketizing, packetized element stream (PES) depacketizing, and sync layer (SL) depacketizing on an error corrected data stream. After separating the audio, video, OD, BIFS and output to each decoder (708 ~ 711).

Each of the decoders 708 to 711 decodes audio, video, OD, and BIFS and outputs the same algorithm. As an example, the second audio decoder 708 decodes the audio signal with the BSAC decoding algorithm, and the video decoder 709 decodes the video signal with the H.264 decoding algorithm.

On the other hand, the terms used in the present invention (terminology) are terms defined in consideration of the functions in the present invention may vary according to the intention or practice of those skilled in the art, the definitions are the overall contents of the present invention It should be based on.

The present invention is not limited to the above-described embodiments, and as can be seen in the appended claims, modifications can be made by those skilled in the art to which the invention pertains, and such modifications are within the scope of the present invention.

The channel management method of the mobile broadcast and the effects of the mobile broadcast transmitter / receiver according to the present invention described above are as follows.

First, by assigning a virtual channel number to each service, each service of a broadcasting station has a unique identification number. This allows for quick channel switching. In particular, you can switch the channel by entering only the channel number of the remote control.

Second, since channel switching is performed according to a virtual channel number designating a broadcasting station, it is possible to switch to a desired broadcasting station only by inputting a specific number.

Third, since it is not a preset, the viewer / listener does not need to remember the preset number, and does not need to newly store the channel number for DMB by using the same number used in the analog frequency.

Those skilled in the art will appreciate that various changes and modifications can be made without departing from the spirit of the present invention.

Therefore, the technical scope of the present invention should not be limited to the contents described in the embodiments, but should be defined by the claims.

Claims (15)

Receiving a terrestrial digital multimedia broadcasting signal including a service reference field assigned with a channel number for uniquely identifying the service for each program service; Decoding the service reference field from the received broadcast signal; Extracting, from the decoded service reference field, a channel number assigned to a service identifier (SId) field of each service field of FIG type 0 / extension 2 in FIG. Generating a label and a channel list of a corresponding program service based on the extracted channel number; And displaying channel information including the channel number and the corresponding program service. delete delete delete delete delete delete delete delete A tuner for processing a baseband signal using a frequency of an ensemble including a service reference field assigned with a unique channel number of a terrestrial digital multimedia broadcasting service; A demodulator for demodulating the terrestrial digital multimedia broadcasting signal; A decoder for decoding a service reference field including channel information based on a synchronization channel in a transport frame of the demodulated broadcast signal; A control unit for generating a channel list by extracting a virtual channel number assigned to a service identifier field (SId) of each service field of the multiplex arrangement information (MCI) in a transmission frame from the decoded service reference field; A memory for storing the generated channel list and channel information; And And a display unit for displaying channel information including the channel number. delete delete delete delete delete

Images