KR20080037643A - Method for controlling digital broadcasting signal - Google Patents

Abstract

A method of controlling a digital broadcasting signal is provided to reduce the number of tables to be monitored and to improve performance of CPU by adding DCCT and DCCSCT to MGT. A method of controlling a digital broadcasting signal comprises a multiplexer(30) multiplexing version information of VCT(Virtual Channel Table) including video data, audio data, and channel information, version information of DCCSCT(Directed Channel Change Selection Code Table) regarding category codes, a PID(Packet ID) of the DCCSCT, and a MGT(Master Guide Table) capable of including version information of the VCT, and a receiver(70) receiving a transmitted broadcasting signal; a step of monitoring a version of the DCCSCT through the version information of the DCCSCT included in the MGT in the received broadcasting signal; and a step of providing a DCC service to a user using new DCCSCT when the version of the DCCSCT changes. The version information of the DCCSCT is the version number thereof. The broadcasting signal is transmitted through VSB(Vestigial Side Band) transmission technique.

Description

Digital broadcast signal control method {METHOD FOR CONTROLLING DIGITAL BROADCASTING SIGNAL}

The present invention relates to a digital broadcast signal control method, and in particular, DCCT (directed channel change table or less, DCCT) and MCS (direct channel change selection code or less), DCCSCT through MGT (Master Guide Table or less, MGT) By controlling and managing the version of the MGT, that is, the DCGT and DCCSCT in the contents of the MGT to enable the management of the version change of the DCCT and DCCSCT through the MGT, thereby increasing the system efficiency of the digital TV receiver and providing the viewers with the DCC of the broadcasting station. The present invention relates to a digital broadcast signal control method for effectively supporting a service.

First of all, in watching a digital TV, if the user sets some items that he / she wants in advance, he or she can watch a program that satisfies the conditions of the predetermined items without having to find the broadcasting channel. By making this change, it is proposed as an extended standard of PSIP (Program and System Information Protocol, or PSIP), which is an ATSC (Advanced Television Systems Committee or less, ATSC) standard of terrestrial and cable digital TV.

In this DCC document 508, two new tables of DCCT and DCCSCT are defined in addition to the basic tables of PSIP, where DCCT is a table indicating when and under what conditions and from which channel to change automatically. DCCSCT is a table that provides digital TV viewers with a code that can be selected according to their tastes by having Category Selection Codes and corresponding values that can be a condition of channel change.

Then, in a DCC digital TV with a built-in DCC function, the digital TV receiver first receives the DCCSCT and displays the contents thereof to the viewer, and the viewer selects a broadcast selection item indicated by a selection code, such as education, movies, and news. Look at the items and preset what you want.

In this way, the viewer automatically changes to a channel that satisfies a preset item condition to provide a DCC function to the viewer.

For reference, DCCT and DCCSCT, like some tables in PSIP, have a version number field, which means that the selection code for the DCC, the channel, time, and conditions to be changed may change.

Therefore, the digital TV receiver should be prepared to always change the two important tables of channel change, that is, DCCT and DCCSCT to the new version (changed content), and all tables of PSIP that can be changed are managed as sub-tables of MGT. Changes must be reflected in the digital TV function.

However, in the prior art operating as described above, since DCCT and DCCSCT are not defined as subtables of the MGT, in order to update a new version of DCCT and DCCSCT, version control of DCCT and DCCSCT is not possible through MGT. The digital TV receiver always has a problem of degrading the performance of the digital TV system by always monitoring whether the version of DCCT and DCCSCT are changed through a Transport (TP) chip.

Accordingly, the present invention has been made in view of the above problems, and the digital TV receiver includes two tables on channel change, that is, DCCT and DCCSCT in the contents of MGT, namely, management of version change of DCCT and DCCSCT. The purpose of this is to improve the system efficiency of the digital TV receiver by providing version control and to provide a digital broadcast signal control method to effectively support the DCC service of broadcasting stations.

As described in detail above, the present invention reduces the number of tables to be monitored by version management of two important tables related to channel change, namely, DCCT and DCCSCT through MGT, improves the performance of the CPI of the digital TV receiver system, and provides a broadcast station to viewers. It has the effect of correctly receiving DCC services.

In order to achieve the above object, the present invention provides international standardization of ISO (International Organization for Standardization) data including MGT (Master Guide Table) including version information of video, audio and Directed Channel Change Selection Code Table (DCCSCT). An MPEG encoder which encodes according to the MPEG standard of the Organization) / IEC (International Electrotechnical Commission International Electrotechnical Commission) and forms an elementary stream, and an elementary stream (elementary stream or less, elementary stream received from the MPEG encoder). In order to manage data in a unit form, a packet compression unit compresses a packet elementary stream, and an audio, video, and data packet elementary stream (PES: packetized elementary stream or less) received from the packet compression unit. 188 bytes in size for efficient transmission A multiplexer for transmitting to a mux digital TV receiver, a modulator for recompressing, modulating and transmitting a transport packet received from the multiplexer, and amplifying a signal from the modulator and transmitting the signal to the transmitter An RF amplifier, a transmitter for transmitting a signal from the RF amplifier, a receiver for receiving and transmitting a digital broadcast signal from the transmitter, a demodulator for demodulating and transmitting a signal received from the receiver, A demultiplexer that separates video, audio, and data from the demodulator and transmits the video, audio, and data by using a packet identifier, and decompresses the video, audio, and data streams received from the demultiplexer, and digitally broadcasts through the screen and the speaker. To watch It is composed of a packet restoration.

The digital broadcast signal control method according to the present invention for achieving the above object, the VCT (Virtual Channel Table) which is a table containing video data, audio data, channel information, and DCCSCT (Directed) which is a table containing a category code Receiving a broadcast signal transmitted by muxing the version information of a Channel Change Selection Code Table, a PID (Packet ID) of the DCCSCT, and a Master Guide Table (MGT) which may include version information of the VCT; And monitoring the version of the DCCSCT through the version information of the DCCSCT included in the MGT in the received broadcast signal, wherein the version change of the DCCSCT is determined through the version information of the DCCSCT in the MGT.

In accordance with another aspect of the present invention, there is provided a digital broadcast signal control apparatus including a demodulator for demodulating a digital broadcast signal; A demultiplexer that separates the transport stream received from the demodulator into data including MGT (Master Guide Table) including version information of video, audio and Directed Channel Change Selection Code (DCCSCT) using a packet identifier; And a restoration unit for restoring compression of video, audio, and data received from the demultiplexer so that digital broadcasting can be viewed through a screen and a speaker, wherein a version change of the DCCSCT is determined based on version information of the DCCSCT in the MGT. Configure.

A digital broadcast signal control method according to the present invention for achieving the above object comprises the steps of: demodulating a digital broadcast signal; Using the packet identifier to separate the demodulated transport stream into data including video, audio, and a master guide table (MGT) including version information of a directed channel change selection code table (DCCSCT); And restoring compression of the separated video, audio, and data so that digital broadcasting can be viewed through a screen and a speaker. The version change of the DCCSCT is determined based on the version information of the DCCSCT in the MGT. .

Hereinafter, operations and effects of the method for controlling digital broadcast signals according to the present invention will be described in detail with reference to the accompanying drawings.

1 is a block diagram showing a configuration of a version control apparatus of a digital TV through the present invention MGT, as shown in the MPEG encoding unit 10 to encode the video, audio and data according to the MPEG standard to form a basic stream form And a packet compression unit 20 for compressing the data of the elementary stream form received from the MPEG encoding unit into a packet elementary stream, and audio and video received from the packet compression unit 20. And a multiplexer 30 for transmitting a packet of 188 bytes in size to efficiently transmit the data packet elementary stream, and a modulator 40 for compressing, modulating, and transmitting the transmission packet received from the multiplexer 30. And an RF amplifying unit 50 for amplifying a signal from the modulator 40 and transmitting the amplified signal to the transmitting unit. A transmitter 60 for transmitting a signal from the receiver, a receiver 70 for receiving and transmitting a digital broadcast signal from the transmitter 60, and a demodulator for demodulating and transmitting a signal received from the receiver 70 ( 80), a demultiplexer 90 which separates and transmits video, audio, and data using the packet identifier from the transport stream received from the demodulator 80, and the video, audio, and data received from the demultiplexer 90. Composed of a packet decompression unit 100 for restoring the compression of the stream to view the digital broadcast through the screen and the speaker, the operation of the present invention configured as described above is as follows.

First, the broadcasting station encodes video, audio, and data through the MPEG encoder 10 according to ISO / IEC 13818-2, 3, 6, and then converts the video, audio, and data into an elementary stream.

Then, the elementary stream is compressed back into the form of a packet, that is, the packet elementary stream through the packet compression unit 20 for efficient compression and management for each unit of data, and the video, audio, and data packet elementary stream is transmitted for efficient transmission. It is made of transport packets of a byte size and are mixed through the multiplexer 30, respectively.

The contiguous gathering of the transport packets muxed through the multiplexer 30 is called a bit stream, and this bit stream for broadcasting is a VSB (Vestigial Sideband Residual Sideband) channel modulator 40 and RF amplifier 50. Compressed and sent out again).

In this way, the transmitted digital broadcast stream (Bit Stream) is the reverse of the above-described order through the digital TV receiver of each home, that is, each demuxed through the demultiplexer 90 and decoded by the decoder 100 to allow the viewer. Allows you to watch digital broadcasts.

As such, the PSIP tables, which contain information on audio, video packet IDs, and other broadcast information (EPG: broadcast program guide information) for each broadcast channel, are stored in the table through a set of demultiplexers (settings for reception). Can be received.

At this time, the maximum number of tables that can be simultaneously set in the demultiplexer 90 is generally about 29, and the rest is allocated one by one for the audio transmission packet and the video transmission packet.

Once the audio / video information (PID value) of the channel and the program is translated through the video cassette tape (VCT) of the PSIP and set in the demultiplexer 90 to monitor the changed channel and program information even if the program is viewed. For this purpose, each table has a version number, where the version number is a value from 0 to 31 that is cycled through and incremented by 1.

For example, if a professional baseball broadcast is performed on channel 15-1 and the information is transmitted to the VCT and the professional baseball is stopped due to rain and the movie is broadcasted, if the VCT has a version number of 3 for the first time, the channel is changed to a movie. A VCT with information will have a version number of four.

Therefore, if the demultiplexer 90 does not receive the VCT because the VCT is received at one time, the VCT will not know the changed contents.

In addition, since a table having other information besides channel information, that is, STT, EITs, and ETTs, has been translated once through the demultiplexer 90, it is impossible to monitor the version change.

However, if all the tables are set in the demultiplexer to monitor the change of the information, the demultiplexer will exceed the maximum number of table settings and the system overhead will be very large.

In order to solve this problem, since PSIP manages the version_number of all tables by placing an MGT, it is no longer necessary to monitor whether a table has been changed once through the demultiplexer 90, and only represents the MGT. The demultiplexer 90 may monitor the change.

In addition, in order to manage the version of the digital TV receiver, first set the MGT in the demultiplexer in the broadcast receiver, and if the version number of the MGT is changed to receive a new MGT.

Here, since the contents of the MGT include PIDs and version numbers of each table, it is possible to compare which tables have been changed, and when such a changed table is found, only the corresponding table is set in the demultiplexer 90 and received again. .

As described above, DCCT and DCCSCT are defined in the contents of the MGT to manage the versions of DCCT and DCCSCT. 90) Reduced module overload and increased system performance.

2 is an exemplary view showing the operation of the packet multiplexer of the present invention. As shown in FIG. 2, a packet multiplexer is used to transmit a packet from a transmitter, and includes a video, audio and other information in a transport stream through a transmission system Is to transmit to the digital TV receiver.

In addition, the multiplexer transmits not only a plurality of broadcasts but also data for providing an interactive service within a range in which a transmission speed is allowed, that is, transmits various information on the same channel.

FIG. 3 is an exemplary view illustrating an operation of the packet demultiplexer of the present invention. As shown in FIG. 3, the packet demultiplexer transmits video, audio, and other information through a packet identifier (PID) through a transport stream transmitted from a channel of a digital TV. To separate again.

In addition, the demultiplexer classifies the necessary information by the same type, and in this case, the packet identifier contained in the header portion of the packet is used to classify the same type.

For reference, in the analog broadcast method, one broadcast is transmitted in one frequency band, but in the digital broadcast method, multiple broadcasts may be sent in one frequency band.

1 is a block diagram showing the configuration of the version control device of the digital TV through the present invention MGT.

Figure 2 is an exemplary view showing the operation of the packet multiplexer of the present invention.

Figure 3 is an exemplary view showing the operation of the packet demultiplexer of the present invention.

*** Explanation of symbols for main parts of drawing ***

10: MPEG encoding unit 20: packet compression unit

30: multiplexer 40: modulator

50: RF amplifier 60: transmitter

70: receiver 80: demodulator

90: demultiplexer 100: packet recovery unit

Claims (4)

VCT (Virtual Channel Table) which is a table containing video data, audio data and channel information, version information of Directed Channel Change Selection Code Table (DCCSCT) which is a table including category codes, PID (Packet ID) of the DCCSCT, and Receiving a broadcast signal transmitted by muxing a master guide table (MGT) which may include version information of the VCT; And And monitoring the version of the DCCSCT through the version information of the DCCSCT included in the MGT in the received broadcast signal. The method of claim 1, wherein the version information of the DCCSCT, And a version number of the table. The method of claim 1, wherein the broadcast signal, Digital broadcast signal control method characterized in that the transmission according to VSB (Vestigial Side Band) transmission technology. The method of claim 1, And providing a DCC service to a user using a new DCCSCT when the version of the DCCSCT is changed.

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