KR20180109316A - Input/output verification method in retransmission system and apparatus thereof - Google Patents

Abstract

Disclosed is a device for verifying an input and an output of a retransmission system, which comprises: a reception unit connected to a retransmission system, and receiving an input signal which is one of a terrestrial broadcast input signal and a broadband input signal and a conversion signal which is one of a terrestrial broadcast conversion signal and an internet protocol (IP) packet conversion signal; a transmission layer analysis unit for analyzing a transmission protocol of the input signal and the conversion signal; an input signal processing unit for extracting a media stream and signaling information from the input signal when the input signal is the terrestrial broadcast input signal, and downloading the media stream and the signaling information using address information included in the input signal when the input signal is the broadband input signal; a conversion signal processing unit for extracting the media stream and the signaling information from the conversion signal when the conversion signal is the terrestrial broadcast conversion signal, and extracting the media stream and the signaling information included in an IP packet when the conversion signal is the IP packet conversion signal; a signaling information analysis unit for comparing the signaling information extracted from the input signal with the signaling information extracted from the conversion signal, and analyzing the same; a decoding unit for decoding the media stream extracted from the input signal and the media stream extracted from the conversion signal on the basis of each signaling information; and a reception analysis unit for separately reproducing the decoded media stream, and outputting an analysis result of the signaling information and that of the transmission protocol.

Description

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an apparatus and method for verifying input / output of a retransmission system,

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method and apparatus for verifying an input / output of a retransmission system, and more particularly, to a method and apparatus for verifying an input / output of a retransmission system in which a broadcasting signal based on ATSC 3.0 is received and retransmitted to an existing digital TV broadcasting service Output verification method of a retransmission system for analyzing and verifying the same.

Currently, digital TV broadcasting including terrestrial, satellite, and cable services are provided using MPEG2-TS (MPEG2-Transport Stream) system technology.

The digital broadcasting system compresses and multiplexes the digital broadcasting system and transmits the digital broadcasting system, and provides a broadcasting service using an appropriate modulation method according to the transmission channel environment.

1 shows a transmission structure of a digital broadcasting system currently being serviced.

An audio or video signal is compressed by an encoder to generate an ES (Elementary Stream). A packetized elementary stream (PES) stream including additional information such as a stream ID, synchronization clock information, and a time stamp for deciding a decoding time of the packet is generated for storage and transmission of the ES. Then, one or more programs are multiplexed and transmitted in the MPEG-2 TS transmission scheme.

 MPEG2-TS is a protocol that transmits multiple PESs in one stream at the same time when transmitting video, audio, and data, and can transmit fixed blocks by attaching TS headers to PES pieces. Here, the TS header includes program information constituting the entire stream, time information of the program, control information for controlling the entire system, and the like.

On the other hand, ATSC 3.0 (Advanced Television System Committee 3.0), which discusses next-generation broadcasting service and system technology, includes IP-based terrestrial broadcasting system which has not been considered in the conventional broadcasting system.

ATSC 3.0 is also capable of providing IP-based broadcasting service in a broadcasting network and providing a hybrid network type multimedia service combining a broadcasting network and a communication network. For Hybrid Service, ATSC 3.0 uses MPU (Media Procession Unit, ISO / IEC 23008-1) or DASH (Dynamic Adaptive Streaming over HTTP, ISO / IEC 23009-1) MMTP (MPEG Media Transport Protocol) for MPU transmission, and ROUTE (Real-time Object Delivery over Unidirectional Transport) for DASH transmission are used. And, transmission of the network uses HTTP (Hypertext Transfer Protocol) protocol.

2 shows a broadcasting system transmission structure based on ATSC 3.0. The A / V encoder receives the broadcast contents, encodes the video signal into the HEVC codec, and encodes the audio signal into the MPEG-H or AC4 codec. Then, it outputs a DASH segment or an MPU based on an ISO Base Media File Format (ISOBMFF) file as a file format for transmission. The transmission server receives the broadcasting service information and the media transmission information from the signaling server, multiplexes them, and transmits the multiplexed information to the gateway. The gateway includes the link layer signaling information together with the link layer packet encapsulation for transmission in the physical layer and transmits the link layer signaling information to the broadcast radiator.

Broadband transmission also provides broadband service through a web server using broadcasting signaling information received from a signaling server through media encoded through an A / V encoder.

 As described above, interworking technology between heterogeneous networks during the transition from the current digital broadcasting service infrastructure to a newly proposed next-generation broadcasting service can be a major issue for broadcasting service providing systems having different system structures.

In order to provide the smart media service pursued in the next generation broadcasting network while maintaining the existing transmission method and facilities, it is necessary to perform not only the device for converting the IP-based broadcasting service transmission into the existing MPEG2-TS broadcasting signal, There is also a need for a device to do this.

SUMMARY OF THE INVENTION The present invention provides a method of verifying input / output of a retransmission system that compares and analyzes broadcast signaling information and media streams step by step in the process of receiving a broadcast signal based on ATSC 3.0 and retransmitting the broadcast signal to an existing digital broadcast service.

The technical objects to be achieved by the present disclosure are not limited to the above-mentioned technical subjects, and other technical subjects which are not mentioned are to be clearly understood from the following description to those skilled in the art It will be possible.

According to an aspect of the present disclosure, an input / output verification apparatus of a retransmission system includes an input signal, which is one of a terrestrial broadcast input signal and a broadband input signal, a terrestrial broadcast conversion signal, and an IP (Internet Protocol) A receiving unit for receiving the converted signal, which is one of the converted signals; A transmission layer analyzer for analyzing a transmission protocol of the input signal and the conversion signal; And extracting a media stream and signaling information from the input signal when the input signal is a terrestrial broadcast input signal and outputting a media stream and signaling information using the address information included in the input signal when the input signal is a broadband input signal, An input signal processing unit for downloading information; Extracting a media stream and signaling information from the converted signal when the converted signal is a terrestrial broadcast conversion signal and converting the extracted media stream and signaling information included in the IP packet when the converted signal is an IP packet conversion signal A signal processor; A signaling information analyzer for comparing and analyzing the signaling information extracted from the input signal and the signaling information extracted from the converted signal; A decoder for decoding the media stream extracted from the input signal and the media stream extracted from the converted signal based on respective signaling information, and a decoder for decoding each of the signaling information analysis result and the transmission protocol analysis And a reception analysis unit for outputting the result.

The features briefly summarized above for this disclosure are only exemplary aspects of the detailed description of the disclosure which follow, and are not intended to limit the scope of the disclosure.

According to the present disclosure, it is possible to verify a broadcast service converted for retransmission along with reception verification of a broadcast signal by comparing and analyzing broadcast signaling and streams step by step.

In addition, according to the present disclosure, it is possible to provide a stable broadcast service, and can be usefully used for developing various IP-based broadcast services.

The effects obtainable from the present disclosure are not limited to the effects mentioned above, and other effects not mentioned can be clearly understood by those skilled in the art from the description below will be.

1 is a diagram for explaining a transmission structure of a digital broadcasting system based on the existing MPEG2-TS standard specification.
2 is a diagram illustrating a broadcast system transmission structure based on the existing ATSC 3.0 standard specification.
3 is a block diagram illustrating an apparatus for verifying an input / output of a retransmission system according to an embodiment of the present disclosure.
4 is a block diagram illustrating a retransmission system and an input / output verification apparatus according to an embodiment of the present disclosure.
5 is a block diagram illustrating a retransmission system in accordance with an embodiment of the present disclosure;
6 is a flowchart illustrating a method of verifying an input / output of a retransmission system according to an embodiment of the present disclosure.

Hereinafter, embodiments of the present disclosure will be described in detail with reference to the accompanying drawings, which will be easily understood by those skilled in the art. However, the present disclosure may be embodied in many different forms and is not limited to the embodiments described herein.

In the following description of the embodiments of the present invention, a detailed description of known functions and configurations incorporated herein will be omitted when it may make the subject matter of the present disclosure rather unclear. Parts not related to the description of the present disclosure in the drawings are omitted, and like parts are denoted by similar reference numerals.

In the present disclosure, when an element is referred to as being "connected", "coupled", or "connected" to another element, it is understood that not only a direct connection relationship but also an indirect connection relationship May also be included. Also, when an element is referred to as " comprising "or" having "another element, it is meant to include not only excluding another element but also another element .

In the present disclosure, the terms first, second, etc. are used only for the purpose of distinguishing one element from another, and do not limit the order or importance of elements, etc. unless specifically stated otherwise. Thus, within the scope of this disclosure, a first component in one embodiment may be referred to as a second component in another embodiment, and similarly a second component in one embodiment may be referred to as a first component .

In the present disclosure, the components that are distinguished from each other are intended to clearly illustrate each feature and do not necessarily mean that components are separate. That is, a plurality of components may be integrated into one hardware or software unit, or a single component may be distributed into a plurality of hardware or software units. Thus, unless otherwise noted, such integrated or distributed embodiments are also included within the scope of this disclosure.

In the present disclosure, the components described in the various embodiments are not necessarily essential components, and some may be optional components. Thus, embodiments consisting of a subset of the components described in one embodiment are also included within the scope of the present disclosure. Also, embodiments that include other elements in addition to the elements described in the various embodiments are also included in the scope of the present disclosure.

Hereinafter, embodiments of the present disclosure will be described with reference to the accompanying drawings.

3 is a block diagram illustrating an apparatus for verifying an input / output of a retransmission system according to an embodiment of the present disclosure.

3, the input / output verification apparatus 300 of the retransmission system includes a receiver 310, a transport layer analyzer 320, an input signal processor 330, a converted signal processor 340, a signal information analyzer 350, A decoding unit 360, and a reception analysis unit 370.

The receiving unit 310 is connected to the retransmission system and receives the input signal, which is either the terrestrial broadcast input signal or the broadband input signal, and the converted signal, which is one of the terrestrial broadcast conversion signal and the IP (Internet Protocol) .

Here, the retransmission system may refer to a system that converts a first standard standard based broadcasting signal into a second standard standard based broadcasting signal different from the first standard and retransmits the same. For example, the retransmission system may be a system that converts ATSC 3.0 based Ultra High Definition Television (UHDTV) broadcast signals into existing MPEG2-TS broadcast signals and retransmits them.

The terrestrial broadcast input signal, which is one of the input signals, may be an ATSC 3.0 based terrestrial broadcast signal, and the broadband input signal may be an ATSC 3.0 based broadband network signal.

The terrestrial broadcast conversion signal, which is one of the converted signals, may be an MPEG2-TS based terrestrial broadcast signal, and the IP packet conversion signal may be an IP network signal.

The receiving unit 310 may include an Ethernet interface to receive a broadband input signal and an IP packet conversion signal if the receiving unit 310 is capable of receiving a terrestrial broadcast input signal and a terrestrial broadcast conversion signal, .

Also, the receiving unit 310 may be connected to a local storage device, and may receive a media file from the local storage device. Here, the media file may be a media file stored in MPEG2-TS or a media file stored in ISOBMFF.

The transport layer analyzer 320 may analyze a transmission protocol of the input signal and the converted signal. Specifically, the input signal and the converted signal received by the receiving unit 310 are analyzed in real time, and transmission protocol information including at least one of the transmission frame configuration and the scheduling information can be confirmed at the transport layer level.

When the input signal is a terrestrial broadcast input signal, the input signal processing unit 330 extracts a media stream and signaling information from the input signal, and when the input signal is a broadband input signal, Stream and signaling information. Specifically, when the input signal is an ATSC 3.0 based terrestrial broadcast signal, the input signal processing unit 330 may extract signaling information from a terrestrial broadcast signal and process a ROUTE or MMTP-based media stream for playback.

Meanwhile, when the input signal is a broadband network signal based on ATSC 3.0, the input signal processing unit 330 may download media stream and signaling information using address information provided in a broadband network, that is, a URL (Uniform Resource Locator) . The input signal processing unit 330 may process the downloaded HTTP-based media stream for playback.

The input signal processing unit 330 may de-multiplex and de-packetize the received media stream to generate a reproducible ISOMFF file-based MPU or DASH segment. have.

When the converted signal is a terrestrial broadcast conversion signal, the converted signal processing unit 340 extracts a media stream and signaling information from the converted signal. If the converted signal is an IP packet converted signal, the converted signal processing unit 340 generates a media stream and signaling information Can be extracted. Specifically, when the input signal is an MPEG2-TS based terrestrial broadcast signal, the converted signal processing unit 340 can extract the signaling information from the terrestrial broadcast signal and process the MPEG2-TS based media stream for playback.

Meanwhile, when the converted signal is an IP packet signal, the converted signal processing unit 340 can extract the media stream and signaling information from the IP packet provided in the IP network. The converted signal processing unit 340 may process the extracted HTTP-based media stream for playback.

The converted signal processing unit 340 may process the received media stream to generate a reproducible A / V elementary stream by de-multiplexing and de-packetizing the received media stream.

The signaling information analysis unit 350 can compare and analyze the signaling information provided by the input signal processing unit 330 and the converted signal processing unit 340. The signaling information analyzing unit 350 receives signaling information including LLS (Low Level Signaling) and SLS (Service Layer Signaling) from the input signal processing unit 330 and outputs the signaling information including the PSI Specific Information) and signaling information including a PSIP (Program and System Information Protocol) signal.

Meanwhile, the signaling information analyzer 350 may compare the signaling information extracted from the input signal and the signaling information extracted from the converted signal, and check whether there is an error in the conversion process for retransmission. Specifically, the signaling information analysis unit 350 may analyze the transmission frame configuration information, the scheduling information, and the component information.

The decoding unit 360 may decode the media stream extracted from the input signal and the media stream extracted from the converted signal, based on the respective signaling information. Specifically, the decoding unit 360 can decode the ATSC 3.0 based ISOMFF-based MPU or DASH segment processed by the input signal processing unit 330. [ The decoding unit 360 may decode the A / V elementary stream processed by the converted signal processing unit 340.

Meanwhile, the decoding unit 360 may decode the media file received from the local storage device.

The reception analysis unit 370 reproduces each decoded media stream in the decoding unit 360 and analyzes the signaling information analysis result analyzed by the signaling information analysis unit 350 and the transmission protocol analysis The result can be output. Specifically, the reception analysis unit 370 expresses each reproduction result and analysis result using a GUI (Graphic User Interface) and outputs the result to a display so that the user can check the verification result.

The reception analysis unit 370 can analyze reproduction, bit rate, media synchronization, and conversion transmission delay by reproducing each of the decoded media streams.

The reception analysis unit 370 can further output verification results such as broadcast program information, transmission frame information, and system information.

4 is a block diagram illustrating a retransmission system and an input / output verification apparatus according to an embodiment of the present disclosure.

Referring to FIG. 4, the retransmission system receives an input signal through terrestrial or broadband based on ATSC 3.0, converts it into an MPEG2-TS packet, and converts it into an MPEG2-TS based broadcasting signal. In addition, the retransmission system can convert an input signal through terrestrial or broadband based on ATSC 3.0 into an MPEG2-TS packet and retransmit it to an IP network for cable broadcasting or IPTV. The input / output verification apparatus of the retransmission system according to an embodiment of the present invention can simultaneously receive the input and the output of the retransmission system, and verify whether the retransmission system operates normally.

5 is a block diagram illustrating a terrestrial UHDTV retransmission system according to an embodiment of the present disclosure.

5, the terrestrial UHDTV retransmission system 500 includes an ATSC 3.0 demodulation unit 510, a broadband service input / output processing unit 520, a transmission packet recombination processing unit 530, a media format conversion unit 540, An MPEG re-multiplexing processing unit 560, a modulation and RF processing unit 570, and an IP packet input / output processing unit 580.

The ATSC 3.0 demodulator 510 demodulates the received ATSC 3.0 terrestrial broadcast input signal to output a baseband signal. Then, the ATSC 3.0 demodulator can extract the IP packet from the output baseband signal.

The broadband service input / output processing unit 520 may extract an IP packet from the received ATSC 3.0 broadband input signal.

The transport packet recombination processor 530 extracts the media data from the IP datagram of the IP packet, performs the service transmission session classification and de-packetizing according to the signaling information, and outputs the voice and image data from the media data Can be extracted.

The media transmission format conversion unit 540 may convert the format of voice and image data according to the MPEG2-TS standard. This is because the video and audio signal compression methods are different in the ATSC 3.0 and MPEG2-TS transmission systems.

The signaling information converting unit 550 may extract the signaling information from the IP packet of the baseband signal and convert the signaling information into the signaling information of the MPEG2-TS standard.

The MPEG re-multiplexing processor 560 can re-multiplex the transcoded media data and the converted signaling information according to the MPEG2-TS standard.

The re-multiplexed MPEG2-TS data stream can be output as an MPEG2-TS terrestrial broadcast conversion signal by the modulation and RF processor 570 according to the broadcasting network to be retransmitted, and the IP packet I / Signal.

6 is a flowchart illustrating a method of verifying an input / output of a retransmission system according to an embodiment of the present disclosure.

Referring to FIG. 6, the input / output verification apparatus is connected to the retransmission system and can receive the input signal, which is either the terrestrial broadcast input signal or the broadband input signal, and the converted signal, which is one of the terrestrial broadcast conversion signal and the IP packet conversion signal (S610).

The input / output verification apparatus can analyze the transmission protocol of the input signal and the converted signal (S620).

If the input signal is a terrestrial broadcast input signal, the input / output verification apparatus may extract the media stream and signaling information from the input signal (S630-1).

If the input signal is a broadband input signal, the input / output verification apparatus may download the media stream and the signaling information using the address information included in the input signal (S630-2).

When the converted signal is a terrestrial broadcast conversion signal, the input / output verification apparatus can extract the media stream and signaling information from the converted signal (S640-1).

On the other hand, if the converted signal is an IP packet conversion signal, the input / output verification apparatus can extract the media stream and the signaling information included in the IP packet (S640-2).

Then, the input / output verification apparatus can compare and analyze the signaling information extracted from the input signal and the signaling information extracted from the converted signal (S650).

The input / output verification apparatus can decode the media stream extracted from the input signal and the media stream extracted from the converted signal, based on the respective signaling information (S660).

Then, the input / output verification apparatus reproduces each of the decoded media streams, and outputs a signaling information analysis result and a transmission protocol analysis result (S670).

The above-described input / output verification method is assumed to be performed by the input / output verification device of FIG. 3, but is not limited thereto.

 3 to 6, the input / output verification method and apparatus of the retransmission system according to the embodiment of the present disclosure have been described.

The input / output verification method and apparatus of the retransmission system of the present disclosure can verify the converted broadcast service for retransmission along with the reception verification of the broadcast signal by comparing and analyzing the broadcast signaling and the stream step by step.

In addition, the input / output verification method and apparatus of the retransmission system of the present disclosure can provide a stable broadcast service, and can be usefully used for the development of various IP-based broadcast services.

On the other hand, according to one aspect of the present disclosure, software or a computer-readable medium having executable instructions for performing the input / output verification method of the retransmission system may be provided. Wherein the executable instructions comprise the steps of receiving an input signal that is one of a terrestrial broadcast input signal and a broadband input signal, a transform signal that is one of a terrestrial broadcast conversion signal and an IP (Internet Protocol) packet conversion signal, Analyzing a signal and a transmission protocol of the converted signal; And extracting a media stream and signaling information from the input signal when the input signal is a terrestrial broadcast input signal and outputting a media stream and signaling information using the address information included in the input signal when the input signal is a broadband input signal, Downloading information; Extracting a media stream and signaling information from the converted signal when the converted signal is a terrestrial broadcast conversion signal and extracting a media stream and signaling information included in the IP packet when the converted signal is an IP packet conversion signal ; Comparing the signaling information extracted from the input signal with the signaling information extracted from the converted signal; Decoding the media stream extracted from the input signal and the media stream extracted from the converted signal based on respective signaling information; And reproducing each of the decoded media streams, and outputting the signaling information analysis result and the transmission protocol analysis result.

Although the exemplary methods of this disclosure are represented by a series of acts for clarity of explanation, they are not intended to limit the order in which the steps are performed, and if necessary, each step may be performed simultaneously or in a different order. In order to implement the method according to the present disclosure, the illustrative steps may additionally include other steps, include the remaining steps except for some steps, or may include additional steps other than some steps.

The various embodiments of the disclosure are not intended to be all-inclusive and are intended to illustrate representative aspects of the disclosure, and the features described in the various embodiments may be applied independently or in a combination of two or more.

In addition, various embodiments of the present disclosure may be implemented by hardware, firmware, software, or a combination thereof. In the case of hardware implementation, one or more application specific integrated circuits (ASICs), digital signal processors (DSPs), digital signal processing devices (DSPDs), programmable logic devices (PLDs), field programmable gate arrays A general processor, a controller, a microcontroller, a microprocessor, and the like.

The scope of the present disclosure is to be accorded the broadest interpretation as understanding of the principles of the invention, as well as software or machine-executable instructions (e.g., operating system, applications, firmware, Instructions, and the like are stored and are non-transitory computer-readable medium executable on the device or computer.

Claims (1)

An apparatus for verifying an input / output of a retransmission system,
A receiving unit connected to the retransmission system and receiving a converted signal, which is any one of an input signal, which is one of a terrestrial broadcast input signal and a broadband input signal, a terrestrial broadcast conversion signal, and an IP (Internet Protocol) packet conversion signal;
A transmission layer analyzer for analyzing a transmission protocol of the input signal and the conversion signal;
And extracting a media stream and signaling information from the input signal when the input signal is a terrestrial broadcast input signal and outputting a media stream and signaling information using the address information included in the input signal when the input signal is a broadband input signal, An input signal processing unit for downloading information;
Extracting a media stream and signaling information from the converted signal when the converted signal is a terrestrial broadcast conversion signal and converting the extracted media stream and signaling information included in the IP packet when the converted signal is an IP packet conversion signal A signal processor;
A signaling information analyzer for comparing and analyzing the signaling information extracted from the input signal and the signaling information extracted from the converted signal;
A decoding unit decoding a media stream extracted from the input signal and a media stream extracted from the converted signal based on respective signaling information; And
And a reception analyzer for reproducing each of the decoded media streams and outputting the signaling information analysis result and the transmission protocol analysis result.

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