KR20120069795A - Method and apparatus of transmitting additional data in digial cable broadcasting system - Google Patents

Abstract

Provided are a method and an apparatus for transmitting additional data in a digital cable broadcasting system. The apparatus for transmitting additional data includes a plurality of additional encoders each encoding a plurality of additional data, a plurality of additional multiplexers respectively connected to the plurality of additional encoders, and multiplexing the encoded plurality of additional data, respectively; And an integrated modulator coupled to the plurality of additional multiplexers for integrating and modulating the multiplexed additional data. By integrating additional data and transmitting through one channel, efficient channel management is possible, and various multimedia broadcasting services can be provided by supporting backward compatibility with a conventional broadcasting system.

Description

Method and device for additional data transmission in digital cable broadcasting system {METHOD AND APPARATUS OF TRANSMITTING ADDITIONAL DATA IN DIGIAL CABLE BROADCASTING SYSTEM}

The present invention relates to digital cable broadcasting, and more particularly, to a method and apparatus for transmitting additional data in a digital cable broadcasting system.

As the digital broadcasting service develops, it is necessary to additionally transmit various data as well as video and audio. That is, additional data may be defined and transmitted to provide a supplementary service in addition to the basic service. It is an application service that uses additional data and defines 3D video service that defines left video as basic service and 3D video service that defines right video or depth data as additional service. Definition (HD) -level video quality may be provided as an additional service, a UHD service, a data service connected with a video service, an EPG (Electronic Program Guide), and the like.

On the other hand, in providing additional services additionally must have backward compatibility with the existing cable broadcasting system (backward compatibility). That is, the new cable broadcasting system providing the additional service and the existing cable broadcasting system should be compatible with each other. When additional data and basic data are integrated and transmitted on one channel, the additional data and the basic data are not compatible with the existing broadcasting system that does not support the additional data. That is, it does not satisfy backward compatibility.

Therefore, the channel through which additional data is transmitted needs to be physically independent from the channel through which basic data is transmitted. In this regard, a method for efficiently transmitting additional data while satisfying backward compatibility is required.

An object of the present invention is to provide an additional data transmission method and apparatus in a digital cable broadcasting system.

In one aspect, an additional data transmission apparatus is provided in a digital cable broadcasting system. The data transmission apparatus includes a plurality of additional encoders each encoding a plurality of additional data, a plurality of additional multiplexers respectively connected to the plurality of additional encoders, and multiplexing the encoded plurality of additional data, respectively; And an integrated modulator coupled to a plurality of additional multiplexers for integrating and modulating the multiplexed additional data.

The additional data transmission apparatus may further include a PSI / PSIP generator connected to each of the plurality of additional multiplexers and generating PSI (Program and System Information) / PSIP (PSI Protocol).

The additional data transmission device may further include an RF unit which is connected to the integrated modulator and transmits the integrated plurality of additional data. The integrated plurality of additional data may be transmitted on one physical channel.

Each of the additional encoders may be a high resolution encoder of a coding scheme to which scalability is applied.

In another aspect, an additional data transmission method is provided in a digital cable broadcasting system. The additional data transmission method includes encoding a plurality of additional data, multiplexing the encoded plurality of additional data, and combining and modulating the multiplexed plurality of additional data.

The additional data transmission method may further include transmitting the integrated plurality of additional data. The integrated plurality of additional data may be transmitted on one physical channel.

The plurality of additional data may be encoded by an encoding method applying scalability.

In another aspect, a method of receiving additional data in a digital cable broadcasting system is provided. The additional data receiving method includes receiving supplementary information (SI), selecting a specific additional service based on the received integrated SI information, and a channel range for the selected additional service from the received integrated SI information Obtaining information, receiving a transport stream (TS) stream for the selected additional service, and recovering additional data from the received TS stream.

The integrated SI information includes information on a program number, program information, carrier frequency, program identifier (PID) parameter, bandwidth, modulation parameter, and channel coding rate for each additional service. It may include at least one of. The TS stream may be received based on information such as bandwidth, modulation parameter and channel coding rate of the integrated SI information, and the additional data may be restored based on PID parameters of the selected additional service.

By integrating additional data and transmitting through one channel, efficient channel management is possible, and various multimedia broadcasting services can be provided by supporting backward compatibility with a conventional broadcasting system.

1 is an example of a channel configuration of a basic service and an additional service according to the proposed additional data transmission method.
2 is an example of a transmitter according to the proposed additional data transmission method.
3 is an embodiment of a proposed additional data transmission method.
4 is an embodiment of a proposed method of receiving additional data.
5 is an embodiment of the proposed basic data receiving method.

DETAILED DESCRIPTION Hereinafter, exemplary embodiments of the present invention will be described in detail with reference to the accompanying drawings so that those skilled in the art may easily implement the present invention. The present invention may, however, be embodied in many different forms and should not be construed as limited to the embodiments set forth herein. In the drawings, parts irrelevant to the description are omitted in order to clearly describe the present invention, and like reference numerals designate like parts throughout the specification. In addition, even if the detailed description is omitted, descriptions of parts easily understood by those skilled in the art are omitted.

Throughout the specification and claims, when a portion is said to "include" a component, it means that it can further include other components, except to the contrary, unless otherwise stated.

Hereinafter, a transmission and reception apparatus and method for providing a more diverse multimedia service than a conventional digital cable broadcasting by providing additional data service while maintaining backward compatibility with a conventional digital cable broadcasting system in a digital cable broadcasting system. do.

1 is an example of a channel configuration of a basic service and an additional service according to the proposed additional data transmission method.

Referring to FIG. 1, a basic service may be provided through a plurality of channels. 2D High Definition (HD) video service is provided through channels 1 through 3 (CH1 through CH3). Although FIG. 1 exemplifies a 2D HD video service as a basic service, the present invention is not limited thereto and various basic services may be provided through various channels. All of the supplementary services for the channels 1 to 3 are integrated and provided in the channel N (CH N). The 3D additional service is provided with respect to the basic service provided in channel 1, and thus 3D additional data may be additionally transmitted. The Ultra High Definition (UHD) supplementary service is provided with respect to the basic service provided in channel 2, and thus, the UHD supplementary data may be additionally transmitted. In addition, an EPG supplementary service is provided with respect to the basic service provided in channel 3, and thus, EPG supplementary data may be additionally transmitted. The 3D additional data, UHD additional data and EPG additional data are all transmitted on channel N. Accordingly, various multimedia broadcasting services can be provided.

2 is an example of a transmitter according to the proposed additional data transmission method.

Referring to FIG. 2, a transmitter providing a proposed method of transmitting additional data may be divided into a basic service part supporting conventional digital cable broadcasting and an additional service part providing various multimedia services through additional data. The structure of the basic service part may have the same structure as that described in the standard document of digital cable broadcasting technology such as Digital Video Broadcasting-Cable (DVB-C) and Data Over Cable Service Interface Specification (DOCSIS). The structure of the additional service part is a structure in which a plurality of additional data to be added are integrated and transmitted on one physical channel. In the following description, the description of the structure of the basic service part is omitted, and only the structure of the additional service part will be described.

The additional service portion includes N additional encoders 110-1, 110-2, ..., 110-N, N additional multiplexers 120-1, 120-2, ..., 120-N, and integrated modulator 130. It includes. The plurality of additional data or additional sources 100-1, 100-2,..., 100 -N are input to N additional encoders 110-1, 110-2,..., 110 -N, respectively. That is, additional source 1 (100-1) is additional encoder 1 (110-1), additional source 2 (100-1) is additional encoder 1 (110-2), additional source N (100-N) is additional encoder N Each input of (110-N). The additional encoder performs media compression on the additional data. Various types of encoders may be applied according to the type of additional data. For example, when the additional service is a 3D video service, the additional data may be a binocular right image or a depth information type depth data. In this case, when the resolution of the existing digital cable broadcasting is increased, an encoder for a high resolution of a coding method applying scalability may be applied. In addition, since backward compatibility with the existing digital cable broadcasting system is maintained according to the proposed invention, the additional encoder may be an encoder to which an encoding technique capable of performing high-efficiency compression may be applied without being limited by the existing standard.

N additional data 100-1, 100-2,..., 100 -N encoded through the N additional encoders 110-1, 110-2,. 120-1, 120-2, ..., 120-N). In this case, multiplexing may be performed based on N PSI (Program and System Information) / PSIP (PSI Protocol) generators 130-1, 130-2, ..., 130-N. N additional data (100-1, 100-2, ..., 100-N) having passed through N additional multiplexers (120-1, 120-2, ..., 120-N) is one by the integrated modulator 150. It is integrated into a stream of and is transmitted by an RF (Radio Frequency) unit.

3 is an embodiment of a proposed additional data transmission method. In step S200, the transmitter encodes a plurality of additional data. In step S210, the transmitter multiplexes the encoded plurality of additional data. In step S220, the transmitter integrates and modulates the multiplexed additional data and transmits the same through the RF unit.

Hereinafter, a method and an apparatus for receiving additional data will be described.

4 is an embodiment of a proposed method of receiving additional data.

In step S300, the receiver receives integrated supplementary information (SI). The integrated SI information may be received through an RF unit, an integrated SI unit demodulator, and an integrated SI unit decoder. The integrated SI information includes information such as program number, program information, carrier frequency, program identifier (PID) parameter, bandwidth, modulation parameter, and channel coding rate for each additional service. It may include.

In step S310, the receiver selects an additional service desired by the user based on the integrated SI information received in step S300. In step S320, the receiver obtains channel range information on the additional service selected by the user in step S310 from the integrated SI information.

In step S330, the receiver receives a transport stream (TS) stream for the additional service stream for the additional service selected by the user. The TS stream may be received through an RF unit, a selective demodulator, and a channel decoder. In addition, information such as bandwidth, modulation parameter and channel coding rate of the integrated SI information may be used to receive the TS stream.

In step S340, the receiver obtains an elementary stream (ES) stream of the additional service associated with the received TS stream based on the PID parameter of the selected additional service, and restores the additional data through a decoder. The PID parameter can be obtained from the integrated SI information. In addition, the ES of the additional service associated with the TS stream may be obtained through a demultiplexer.

5 is an embodiment of the proposed basic data receiving method.

In step S400, the receiver receives the integrated SI information. In step S410, the receiver performs RF tuning based on carrier frequency information of the selected basic service of the received integrated SI information. In step S420, the receiver acquires basic data through the RF unit, the demodulator, the demultiplexer, and the decoder based on the PID information of the selected basic service.

4 and 5, the received basic data and additional data may be integrated and provided to the user. Integration of the basic data and the additional data may be performed based on service integration control information of the integrated SI information. For example, in the case of a 3D video service, the service integration control information may be information related to a 3D merger.

By using the proposed additional data transmission method, a plurality of additional data for an additional service may be integrated and transmitted into one physical channel. Accordingly, backward compatibility of providing additional services can be maintained while maintaining existing digital cable broadcasting, and an efficient transmission and compression scheme can be applied without restriction on broadcast standards. In addition, efficient channel management can be achieved by transmitting additional data through one channel.

The present invention may be implemented in hardware, software, or a combination thereof. (DSP), a programmable logic device (PLD), a field programmable gate array (FPGA), a processor, a controller, a microprocessor, and the like, which are designed to perform the above- , Other electronic units, or a combination thereof. In the software implementation, the module may be implemented as a module that performs the above-described function. The software may be stored in a memory unit and executed by a processor. The memory unit or processor may employ various means well known to those skilled in the art.

In the above-described exemplary system, the methods are described on the basis of a flowchart as a series of steps or blocks, but the present invention is not limited to the order of the steps, and some steps may occur in different orders or simultaneously . In addition, those skilled in the art will appreciate that the steps shown in the flowcharts are not exclusive and that other steps may be included or one or more steps in the flowcharts may be deleted without affecting the scope of the present invention.

The above-described embodiments include examples of various aspects. While it is not possible to describe every possible combination for expressing various aspects, one of ordinary skill in the art will recognize that other combinations are possible. Accordingly, it is intended that the invention include all alternatives, modifications and variations that fall within the scope of the following claims.

Claims (13)

In the additional data transmission apparatus in a digital cable broadcasting system,
A plurality of additional encoders each encoding a plurality of additional data;
A plurality of additional multiplexers, each connected to the plurality of additional encoders, each of multiplexing the encoded plurality of additional data; And
And an integrated modulator connected to the plurality of additional multiplexers and configured to integrate and modulate the multiplexed additional data. The method of claim 1,
And a PSI / PSIP generator connected to the plurality of additional multiplexers, respectively, for generating PSI (Program and System Information) / PSIP (PSI Protocol). The method of claim 1,
And a radio frequency (RF) unit connected to the integrated modulator and transmitting the integrated plurality of additional data. The method of claim 3, wherein
And the integrated plurality of additional data is transmitted through one physical channel. The method of claim 1,
Wherein each of the additional encoders is a high resolution encoder of a coding scheme to which scalability is applied. In the digital cable broadcasting system, in the additional data transmission method,
Encoding a plurality of additional data;
Multiplexing the encoded plurality of additional data; And
Integrating and modulating the multiplexed plurality of additional data. The method according to claim 6,
Transmitting the integrated plurality of additional data. The method of claim 7, wherein
The integrated plurality of additional data is transmitted on one physical channel. The method according to claim 6,
And the plurality of additional data are encoded by an encoding method applying scalability. In the method for receiving additional data in a digital cable broadcasting system,
Receiving integrated Supplementary Information (SI) information;
Selecting a specific additional service based on the received integrated SI information;
Obtaining channel range information for the selected additional service from the received integrated SI information;
Receiving a TS stream for the selected supplementary service; And
And recovering additional data from the received TS stream. 11. The method of claim 10,
The integrated SI information includes information on a program number, program information, carrier frequency, program identifier (PID) parameter, bandwidth, modulation parameter, and channel coding rate for each additional service. Additional data receiving method comprising at least one of. The method of claim 11,
And the TS stream is received based on information such as bandwidth, modulation parameter, channel coding rate, and the like of the integrated SI information. The method of claim 11,
The additional data receiving method, characterized in that the additional data is restored based on the PID parameter of the selected additional service.

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