KR20060055959A - A system time table data structure - Google Patents

A system time table data structure Download PDF

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KR20060055959A
KR20060055959A KR1020040095166A KR20040095166A KR20060055959A KR 20060055959 A KR20060055959 A KR 20060055959A KR 1020040095166 A KR1020040095166 A KR 1020040095166A KR 20040095166 A KR20040095166 A KR 20040095166A KR 20060055959 A KR20060055959 A KR 20060055959A
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time
time zone
data structure
time table
system time
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KR1020040095166A
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Korean (ko)
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김성덕
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주식회사 대우일렉트로닉스
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    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
    • H04N21/00—Selective content distribution, e.g. interactive television or video on demand [VOD]
    • H04N21/40—Client devices specifically adapted for the reception of or interaction with content, e.g. set-top-box [STB]; Operations thereof
    • H04N21/43—Processing of content or additional data, e.g. demultiplexing additional data from a digital video stream; Elementary client operations, e.g. monitoring of home network or synchronising decoder's clock; Client middleware
    • H04N21/434—Disassembling of a multiplex stream, e.g. demultiplexing audio and video streams, extraction of additional data from a video stream; Remultiplexing of multiplex streams; Extraction or processing of SI; Disassembling of packetised elementary stream
    • H04N21/4346—Disassembling of a multiplex stream, e.g. demultiplexing audio and video streams, extraction of additional data from a video stream; Remultiplexing of multiplex streams; Extraction or processing of SI; Disassembling of packetised elementary stream involving stuffing data, e.g. packets or bytes
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
    • H04N21/00—Selective content distribution, e.g. interactive television or video on demand [VOD]
    • H04N21/40—Client devices specifically adapted for the reception of or interaction with content, e.g. set-top-box [STB]; Operations thereof
    • H04N21/43—Processing of content or additional data, e.g. demultiplexing additional data from a digital video stream; Elementary client operations, e.g. monitoring of home network or synchronising decoder's clock; Client middleware
    • H04N21/435—Processing of additional data, e.g. decrypting of additional data, reconstructing software from modules extracted from the transport stream
    • H04N21/4351—Processing of additional data, e.g. decrypting of additional data, reconstructing software from modules extracted from the transport stream involving reassembling additional data, e.g. rebuilding an executable program from recovered modules

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  • Engineering & Computer Science (AREA)
  • Multimedia (AREA)
  • Signal Processing (AREA)
  • Electric Clocks (AREA)

Abstract

본 발명은 사용자가 별도로 타임존(Timezone)을 설정할 필요없도록 시스템 시간 테이블에 타임존 필드를 추가하여 자동으로 정확한 시간이 설정되도록 한 시스템 시간 테이블 데이타 구조에 관한 것으로서, 시스템 시간 테이블 내부에 지역에 따라 시간대를 설정하는 타임존 필드를 구비하여 사용자의 지역에 따라서 상기 타임존을 통해 자동으로 현재 시간이 설정되도록 한 것을 특징으로 한다.The present invention relates to a system time table data structure in which a time zone is added to a system time table so that a correct time is automatically set so that a user does not need to set a time zone separately. And a time zone field for setting a time zone so that the current time is automatically set through the time zone according to the user's region.

PSIP, STT, 타임존 필드, 현재 시간PSIP, STT, Time Zone Field, Current Time

Description

시스템 시간 테이블 데이타 구조{A system time table data structure}A system time table data structure

도 1 은 일반적인 시스템 시간 테이블 데이타 구조를 나타낸 도면.1 illustrates a typical system time table data structure.

도 2 는 본 발명에 따른 시스템 시간 테이블 데이타 구조를 나타낸 도면.2 illustrates a system time table data structure in accordance with the present invention.

도 3 은 본 발명에 따른 시스템 시간 테이블을 통한 현재 시간 설정과정을 나타낸 순서도.
3 is a flowchart illustrating a current time setting process through a system time table according to the present invention.

본 발명은 PSIP(Program and System Information Protocol)의 시스템 시간 테이블(System Time Table;STT)에 관한 것으로서, 더욱 상세하게는 사용자가 별도로 타임존(Timezone)을 설정할 필요없도록 시스템 시간 테이블에 타임존 필드를 추가하여 자동으로 정확한 시간이 설정되도록 한 시스템 시간 테이블 데이타 구조에 관한 것이다.The present invention relates to a System Time Table (STT) of a Program and System Information Protocol (PSIP). More particularly, the present invention relates to a time zone field in a system time table so that a user does not need to set a time zone. In addition, it relates to a system timetable data structure that allows the correct time to be set automatically.

일반적으로 전자 프로그램 가이드(Electronic Program Guide;EPG)와 시스템 정보(System Information;SI)를 하나로 정의 해 놓은 것이 PSIP이다.In general, PSIP defines an electronic program guide (EPG) and system information (SI) as one.

이 PSIP는 지상파 및 케이블 디지털 방송을 위한 ATSC(Advanced Television System Committee)의 규격으로서, MPEG-2(Moving Picture Experts Group)의 방법으로 엔코딩된 메시지들을 파싱(Parsing)하여 프로그램에 관한 다양한 정보를 제공하기 위해 정의해 놓은 것이다.This PSIP is an ATSC (Advanced Television System Committee) standard for terrestrial and cable digital broadcasting. It parses messages encoded by the method of Moving Picture Experts Group (MPEG-2) to provide various information about the program. It is defined for.

즉, 상기한 PSIP는 MPEG-2 비디오와 AC-3 오디오 포맷으로 만들어진 A/V 데이터를 송수신하고, 각 방송국의 채널들에 대한 정보 및 채널의 각 프로그램에 대한 정보 등을 전송할 수 있도록 여러 테이블들로 구성되어 있다. That is, the PSIP transmits and receives A / V data made in MPEG-2 video and AC-3 audio format, and transmits information about channels of each broadcasting station and information about each program of channels. Consists of

그리고, 이 PSIP는 채널을 선택하여 워하는 방송의 A/V 서비스를 하는 주 기능과 방송 프로그램에 대한 EPG 즉, 방송 안내 서비스를 하는 부가 기능을 지원할 수 있다. The PSIP may support a main function of A / V service of a broadcast by selecting a channel and an additional function of EPG, that is, a broadcast guide service for a broadcast program.

이때, 채널 선택을 위한 채널 정보와 A/V의 수신을 위한 패킷 인식 번호(PID) 등의 정보는 가상 채널 테이블(Virtual Channel Table), 각 채널의 방송 프로그램들의 EPG 정보들은 EIT를 통하여 각각 전송되어진다. In this case, information such as channel information for channel selection and packet identification number (PID) for receiving A / V may be transmitted through a virtual channel table, and EPG information of broadcast programs of each channel may be transmitted through an EIT. Lose.

이밖에도 PSIP에는 시간 정보를 위한 STT, 프로그램 등급을 위한 지역 및 심의 기관 등에 대한 정보를 전송하기 위한 RRT(Rating Region Table), 채널 및 방송 프로그램에 대한 부가 설명을 위한 ETT(Extended Text Table), 그리고 이와 같은 각 테이블들의 버전 및 PID 관리를 위한 MGT(Master Guide Table) 등이 있다.In addition, the PSIP includes an STT for time information, a RRT (Rating Region Table) for transmitting information about regions and review institutions for program grades, an Extended Text Table (ETT) for additional description of channels and broadcast programs, and the like. There are MGT (Master Guide Table) for version and PID management of each table.

이들 테이블들은 섹션이라 불리는 데이터 구조에 의해 전송된다. 즉, 상기한 테이블들은 모두 섹션이라는 기본 단위를 가지며 하나 이상의 섹션들이 조합되어 하나의 테이블을 구성하게 된다.These tables are transmitted by data structures called sections. That is, the above tables all have a basic unit called a section, and one or more sections are combined to form one table.

이때, 상기 테이블들 중 EIT는 가상 채널의 이벤트에 관한 정보들(제목, 시 작 시간 등)을 가진다. 여기서, 하나의 이벤트는 대부분의 경우 하나의 전형적인 텔레비젼 프로그램이다. 그리고, EIT-K의 형식으로 최대 128개의 EIT를 전송할 수 있다. At this time, the EIT of the tables has information (title, start time, etc.) about the event of the virtual channel. Here, one event is in most cases one typical television program. And, up to 128 EITs can be transmitted in the form of EIT-K.

즉, PSIP는 최소 4개, 최대 128개의 EIT를 가지며, 각 EIT는 특정 시간 대역을 가진 이벤트 정보를 제공한다.That is, the PSIP has a minimum of four and a maximum of 128 EITs, and each EIT provides event information having a specific time band.

도 1 은 일반적인 시스템 시간 테이블 데이타 구조를 나타낸 도면으로서, 일반적인 시스템 시간 테이블의 비트스트림 신택스(Syntax)를 나타내고 있다. FIG. 1 is a diagram illustrating a general system time table data structure and shows a bitstream syntax of a general system time table.

도시된 바와 같이, table_id는 테이블 식별자를 나타내고, section length는 section length 필드 뒤를 이어 나타나게 될 섹션의 나머지 길이를 나타내며, version_number는 시스템 시간 테이블의 버전 값을 나타낸다. 또한, protocol version은 현재의 프로토콜 번전을 표시하는 것으로서, 초기의 버전은 0을 사용하고 프로토콜이 변경되면 0이 아닌 다른 값을 사용한다. CRC_32는 오류정정용 32비트 CRC 값이다.As shown, table_id represents a table identifier, section length represents a remaining length of a section to appear after a section length field, and version_number represents a version value of a system time table. In addition, the protocol version indicates the current protocol version, and the initial version uses 0. If the protocol is changed, a value other than 0 is used. CRC_32 is a 32-bit CRC value for error correction.

특히, system_time은 1980년 1월6일 12am으로부터 현재 시각까지 경과된 GPS초를 나타낸 32-bit unsigned integer이다. system_time은 이 값을 포함하는 STT section의 마지막 바이트가 수신측에 도착하는 시각을 기준으로 ±4초 범위의 오차 한계를 갖는다.In particular, system_time is a 32-bit unsigned integer representing the GPS seconds elapsed from 12am on January 6, 1980 to the current time. system_time has an error limit of ± 4 seconds based on the time when the last byte of the STT section containing this value arrives at the receiver.

또한, GPS_UTC_offset은 GPS 와 UTC 표준 시간 사이의 차이를 초 단위로 나타낸 8-bit unsigned integer이다. GPS time을 UTC 로 변환하기 위해서는 GPS time에서 GPS_UTC_offset을 빼야 한다. International Bureau of Weights and Measures에서 현재의 offset에 에러가 클 경우 추가적인 leap second 가 더해지거나 빼지며, GPS_UTC_offset에 이 변화가 반영된다.Also, GPS_UTC_offset is an 8-bit unsigned integer representing the difference in seconds between GPS and UTC standard time. To convert GPS time to UTC, you must subtract GPS_UTC_offset from GPS time. In the International Bureau of Weights and Measures, if the error is large at the current offset, an additional leap second is added or subtracted and this change is reflected in GPS_UTC_offset.

daylight_savings는 일광절약시간(summer time) 제어 바이트를 나타낸다. daylight_savings represents a summer time control byte.

이러한 PSIP의 STT 테이블을 통한 시간 설정과정은 다음과 같다.The time setting process through the STT table of the PSIP is as follows.

최초, 현재시간 설정한 상태에서 디지털 TV의 튜너를 튜닝시킨 후, 시스템 시간 테이블에서 시간 데이타를 추출한 후, 유효 시간이 설정된다. First, after tuning the tuner of the digital TV with the current time set, after extracting the time data from the system time table, the effective time is set.

여기서, 시스템 시간 테이블에서 시간 데이타를 추출하는 과정은 system_time을 구하고, system_time에서 GPS_UTC_offset값을 뺀 후, 이때 사용자가 타임존을 입력한다. 이 타임존이 입력되면, 이 타임존을 통해 얻은 시간에 daylight saving 처리하여 시간 포맷으로 변경한다.Here, the process of extracting time data from the system time table obtains system_time, subtracts the GPS_UTC_offset value from system_time, and then inputs the time zone by the user. When this time zone is entered, daylight saving is applied to the time obtained through this time zone to change to the time format.

하지만, 상기한 system_time에서 GPS_UTC_offset값이 정확하지 않으므로 상기한 바와 같이, 사용자가 타임존을 일일이 선택하여야 하였다. However, since the GPS_UTC_offset value is not accurate in the system_time, as described above, the user has to select the time zone one by one.

즉, PSIP 의 시스템 시간 테이블은 상기한 바에 따라서 현재 시간을 자동으로 설정할 수 있지만, 이 시간은 정확한 시간이 아니다. 따라서, 사용자는 이렇게 얻은 시간에 타임존을 따로 설정해야 하는 번거로움이 있었다.
That is, the system time table of the PSIP can automatically set the current time as described above, but this time is not an accurate time. Therefore, the user has had to set a separate time zone at this time.

본 발명은 전술한 문제점을 해결하기 위해 안출된 것으로서, 사용자가 별도로 타임존을 설정할 필요없도록 시스템 시간 테이블에 타임존 필드를 추가하여 자동으로 정확한 시간이 설정되도록 시스템 시간 테이블 데이타 구조에 관한 것이다.
The present invention has been made to solve the above-described problem, and relates to a system time table data structure in which a correct time is automatically set by adding a time zone field to the system time table so that a user does not need to set a time zone separately.

전술한 목적을 달성하기 위해 안출된 본 발명의 구성은 다음과 같다. 본 발명은 PSIP 중 현재 시간과 날짜를 설정하는 시스템 시간 테이블(STT)의 데이타 구조에 있어서, 시스템 시간 테이블 내부에 지역에 따라 시간대를 설정하는 타임존 필드를 구비하여 사용자의 지역에 따라서 상기 타임존을 통해 자동으로 현재 시간이 설정되도록 한 것을 특징으로 한다.The configuration of the present invention devised to achieve the above object is as follows. The present invention provides a data structure of a system time table (STT) for setting a current time and date in a PSIP, and includes a time zone field for setting a time zone according to a region in a system time table. It is characterized in that the current time is automatically set through.

여기서, 상기한 타임존 필드는 1바이트 또는 2바이트가 할당되는 것을 특징으로 한다.
Here, the time zone field is characterized in that one byte or two bytes are allocated.

이하에서는 본 발명의 바람직한 실시예를 첨부된 도면을 참조하여 상세하게 설명한다.Hereinafter, with reference to the accompanying drawings, preferred embodiments of the present invention will be described in detail.

도 2 는 본 발명에 따른 시스템 시간 테이블 데이타 구조를 나타낸 도면이고, 도 3 은 본 발명에 따른 시스템 시간 테이블을 통한 현재 시간 설정과정을 나타낸 순서도이다.2 is a diagram illustrating a system time table data structure according to the present invention, and FIG. 3 is a flowchart illustrating a current time setting process through a system time table according to the present invention.

도시된 바와 같이, 본 발명에 따른 시스템 시간 테이블 데이타 구조는 일반적인 시스템 시간 테이블과 유사하나 내부에 타임존 필드를 별도로 구비하였다.As shown, the system time table data structure according to the present invention is similar to a general system time table, but has a time zone field separately therein.

즉, GPS_UTC_offset 아래에 1바이트 또는 2바이트가 할달된 타임존 필드가 구비되므로, 별도로 사용자가 타임존을 설정할 필요없이 자동으로 타임존이 설정되므로 정확한 현재 시간이 설정될 수 있다. That is, since a time zone field in which one byte or two bytes are allocated under GPS_UTC_offset is provided, the time zone is automatically set without the user needing to set a time zone, and thus an accurate current time can be set.                     

이는 도 3 에 도시된 바와 같이, 최초 system_time이 설정(S10)되고, system_time에서 GPS_UTC_offset을 뺀 후(S20), 이 값에서 타임존을 설정을 자동으로 수행(S30)하도록 하고, 여기에 daylight saving 처리(S40)하여 time format으로 변경(S50)된다.3, the initial system_time is set (S10), the GPS_UTC_offset is subtracted from the system_time (S20), and the time zone is automatically set from this value (S30), and daylight saving processing is performed here. In operation S40, the display apparatus changes to the time format in operation S50.

즉, 사용자가 타임존을 일일이 설정하여야 하는 종래의 문제점을 해결하도록 시스템 시간 테이블 내부에 타임존 필드를 구비하고 이 타임존에 따라 현재 시간이 자동으로 설정되도록 한다.That is, in order to solve the conventional problem of the user having to set the time zone manually, a time zone field is provided in the system time table, and the current time is automatically set according to the time zone.

이는 다수개의 공중파가 겹치는 지역에서 유선사업체를 통해 실행하는 경우에 더욱 유리하다.This is even more advantageous when implemented through wired operators in areas where multiple airwaves overlap.

본 발명은 전술한 실시예에 국한되지 않고 본 발명의 기술사상이 허용하는 범위 내에서 다양하게 변형하여 실시할 수 있다.
The present invention is not limited to the above-described embodiments and can be carried out in various modifications within the scope of the technical idea of the present invention.

이와 같이 구성되는 본 발명에 따르면, 시스템 시간 테이블에 타임존 필드를 추가하여 자동으로 시간이 설정되도록 하여 사용자가 별도로 타임존을 번거롭게 설정할 필요없이 정확한 시간을 설정할 수 있다.According to the present invention configured as described above, the time is automatically set by adding a time zone field to the system time table so that the user can set an accurate time without having to set a separate time zone.

Claims (2)

PSIP 중 현재 시간과 날짜를 설정하는 시스템 시간 테이블(STT)의 데이타 구조에 있어서, In the data structure of the system time table (STT) that sets the current time and date of the PSIP, 상기 시스템 시간 테이블 내부에 지역에 따라 시간대를 설정하는 타임존 필드를 구비하여 사용자의 지역에 따라서 상기 타임존을 통해 자동으로 현재 시간이 설정되도록 한 것을 특징으로 하는 시스템 시간 테이블 데이타 구조.And a time zone field for setting a time zone according to a region in the system time table, so that a current time is automatically set through the time zone according to a user's region. 제 1 항에 있어서, 상기 타임존 필드는 1바이트 또는 2바이트가 할당되는 것을 특징으로 하는 시스템 시간 테이블 데이타 구조.2. The system time table data structure according to claim 1, wherein the time zone field is allocated one byte or two bytes.
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