KR20000034379A - Method for updating psip information of digital tv receiver system - Google Patents

Abstract

PURPOSE: A method for updating PSIP(program and system information protocol) information of digital TV receiver system is provided to detect a channel and to update PSIP information frequently for a quick channel change. CONSTITUTION: A method for updating PSIP information of digital TV receiver system includes first thru fifth steps. The receiver system receives a digital broadcasting signal when a receive mode is a multi channel, an A/V signal when the receive mode is A/V, and a PC signal when the receive mode is PC. At the first step, the digital broadcasting signal of a digital broadcasting channel is received when the mode is A/V or PC. At the second step, extracts the PSIP included in the digital broadcasting signal is extracted. At the third step, determine whether the extracted PSIP information is updated or not is judged. At the forth step, the PSIP information stored in a memory(140) after erasing previous PSIP if the extracted PSIP information is updated

Description

How to update PS IP of digital TV receiving system

The present invention relates to a broadcast signal by operating a tuner in an idle state when processing a video signal provided from an external device through an A / V (Audio / Video) input terminal or a PC input terminal. The present invention relates to a method of updating PSIP information of a digital TV receiver for updating loaded Program and System Information Protocol (PSIP) information.

In general, a digital TV receiver receives both a digital broadcast signal and an analog broadcast signal, and is also provided from an external A / V device or a PC through an A / V (Audio. Video) terminal or a PC (personal computer) terminal. It is designed to service the video / audio signal.

Accordingly, the digital TV receiver includes modules for signal processing of digital broadcast signals, analog broadcast signals, external A / V signals, and PC signals, respectively.

The digital broadcast signal largely includes program information and program and system information protocol (PSIP) information. The program information represents, for example, a TV program provided by a broadcaster for the purpose of being broadcast to a subscriber, and includes user information such as video information, audio information, and caption data. In addition, PSIP information includes identification information for demultiplexing video and audio information from a packet stream carried on a carrier channel, brief contents of a TV program, presence or absence of a caption service, a program grade, and a schedule of a TV program. Includes event information table (EIT) information for guiding (schedual).

When a predetermined digital broadcasting channel is selected, the digital TV receiving system is tuned to the corresponding broadcasting channel, and then separates the PSIP information from the packet stream, stores it in the internal memory, and demultiplexes the video and audio information using the stored PSIP information. do. In addition, by using the EIT information, the user performs a service of guiding a user of a simple content of a TV broadcast program, whether or not there is a caption service, a program grade, and a schedule of the TV broadcast program. At this time, the EIT information is inevitably updated at any time due to the characteristics of the information, for example, is updated every three hours. Therefore, the digital TV receiving system updates PSIP information by separating / receiving PSIP information at three-hour intervals, for example.

If such a digital TV reception system is in, for example, an analog broadcast channel reception mode, an A / V reception mode, a PC reception mode, or a power off state, the PSIP information cannot be updated. If the digital broadcast channel is selected while the PSIP information is not updated, the digital TV reception system must separate / receive the PSIP information, store it in memory, and then perform the following operation. Is generated.

Accordingly, the present invention is to solve the above-mentioned problems of the prior art, by detecting the digital broadcast channel during operation in the A / V reception mode, PC reception mode, by separating / receiving and storing the PSIP information from time to time, digital broadcasting It is an object of the present invention to provide a method for updating PSIP information of a digital TV receiving system that enables channel switching to a channel more quickly.

The present invention for achieving the above object, in the digital broadcast channel reception mode, receives a digital broadcast signal loaded on the digital broadcast channel, receives an A / V signal input from the outside in the A / V reception mode, PC reception A method of updating a PSIP information of a digital TV receiving system, comprising receiving a PC signal input from an external device in a mode, wherein the digital broadcast signal includes PSIP information and has a memory for storing the PSIP information. Receiving a digital broadcast signal of the digital broadcast channel when the TV reception system is in an A / V reception mode or a PC reception mode; Separating the PSIP information included in the digital broadcast signal; Determining whether the separated PSIP information is updated information; And if the separated PSIP information is updated information, deleting the PSIP information stored in the memory and newly storing the separated PSIP information in the memory.

1 is a block diagram of a digital TV receiving system for performing the PSIP information updating method according to a preferred embodiment of the present invention.

<Description of the code | symbol about the principal part of drawing>

105: tuner 110: digital broadcast signal decoder

115: IF processing unit 120: chroma demodulation unit

125: first multiplexer 130: second multiplexer

135: system control unit 140: memory

Hereinafter, exemplary embodiments of the present invention will be described in detail with reference to the accompanying drawings.

1 illustrates a digital TV reception system for performing a method of updating PSIP information according to an embodiment of the present invention. In FIG. 1, the digital TV reception system includes a tuner 105, a digital broadcast signal decoder 110, an intermediate frequency (IF) processor 115, a chroma demodulator 120, and a first multiplexer 125. , A second multiplexer 130, a system controller 135, and a memory 140.

Referring to FIG. 1, when the digital broadcast channel reception mode is entered, the system controller 135 transmits a control signal for detecting a default digital broadcast channel or a selected digital broadcast channel to the tuner 105 through a line L1. to provide.

The tuner 105 detects the packet stream carried on the digital broadcast channel based on the control signal on the line L1, and provides the tuner 105 to the digital broadcast signal decoder 110 through the line L2.

The digital broadcast signal decoder 110 includes a channel decoder 112, a PSIP separation unit 114, a demultiplexer 116, and a video MPEG decoder 118.

The channel decoder 112 channel decodes the packet stream on line L2 to correct the error. The error corrected packet stream is provided to the PSIP separator 114 via line L3. The PSIP separation unit 114 detects only the PSIP information from the packet stream on the line L3 and provides it on the line L4, and provides the packet stream including the remaining video and audio information on the line L5.

The system controller 135 receives the PSIP information on the line L4 and stores it in the memory 140, and then provides a control signal for separating the video and audio information to the demultiplexer 116 through the line L6 based on the PSIP information.

On the other hand, the packet stream on line L5 is provided to the demultiplexer 116. Therefore, the demultiplexer 116 divides the input packet stream into audio information and video information based on the control signal on the line L6, outputs the video information to the line L7, and outputs the audio information to the line 8.

Video information on line L7 is provided to video MPEG decoder 118. The video MPEG decoder 118 decompresses the input video information based on a predetermined MPEG decoding technique, converts the received video information into R, G, and B signals, and detects a synchronization signal. The R, G, and B signals and the synchronization signal of the video MPEG decoder 118 are provided on the line L9.

When the digital TV reception system is in the digital broadcast channel reception mode, when a program guide key signal is input to the system control unit 135, the system control unit 135 reads the EIT information stored in the memory 140 on line L10. to provide. EIT information on the line L10 is input to the video MPEG decoder 118. The video MPEG decoder 118 converts the EIT information input through the line L10 into signal processing and analog and provides the same on the line L9.

In the digital broadcast channel reception mode, the system control unit 135 detects the EIT update determination data from the PSIP information on the line L4, determines whether the EIT information has been updated based on the EIT update determination data, and the EIT information has been updated. In this case, the PSIP information stored in the memory 140 is deleted, and the PSIP information on the line L4 is newly stored in the memory 140.

On the other hand, when the digital TV reception system enters the analog broadcast channel reception mode, the system control unit 135 tunes the control signal for detecting the default analog broadcast channel or the selected analog broadcast channel through the line L1. To provide.

The tuner 105 detects the analog broadcast signal carried on the analog broadcast channel based on the control signal on the line L1 and provides it to the IF processor 115 through the line L11.

The IF processor 115 detects the composite video signal from the detected analog broadcast signal on the line L11 and provides it to the chroma demodulator 120 through the line L12. The chroma demodulator 120 is provided with a composite video signal through a line L12, and an A / V signal is input from an A / V input terminal through a line L13. Thus, when the digital TV receiving system is in the analog broadcast channel receiving mode, the system control unit 135 provides a high selection first selection signal through the line L14.

When the first selection signal in the high state is input through the line L14, the chroma demodulator 120 demodulates the composite video signal on the line L12 into R, G, and B signals, detects the synchronization signal, and provides it to the line L15. do.

When the digital TV receiving system is in the A / V receiving mode, the system controller 135 provides the chroma demodulator 120 with the first selection signal in a low state through the line L14. When the first demodulation signal in the low state is input through the line L14, the chroma demodulator 120 demodulates the A / V signal on the line L13 into R, G, and B signals, detects a synchronous signal, and goes to the line L15. to provide.

The R, G, B signals and the synchronization signal on the line L9, and the R, G, B signals and the synchronization signal on the line L15 are provided to the first multiplexer 125. The system controller 135 provides the second multiplexer 125 with a high selection state through the line L16 to the first multiplexer 125 if the digital TV receiving system is in the digital broadcast channel receiving mode, and the digital TV receiving system is in the analog channel receiving mode or A. In the / V mode, the second select signal of the low state is provided to the first multiplexer 125 through the line L16.

Accordingly, the first multiplexer 125 selects the R, G, B signals and the synchronization signal on the line L9 or the R, G, B signals and the synchronization signal on the line L15 based on the second selection signal on the line L16. Provided on line L17.

The second multiplexer 130 receives an R, G, B signal and a synchronization signal through a line L17, and receives an R, G, B signal and a synchronization signal provided from a PC input terminal through a line L18.

The system control unit 135 provides the second multiplexer 130 with a third selection signal in a high state through the line L19 when the digital TV receiving system is a digital broadcast channel reception mode, an analog broadcast channel reception mode, or an A / V reception mode. If the digital TV receiving system is in the PC receiving mode, the third select signal in a low state is provided to the second multiplexer 130 through the line L19.

Accordingly, the second multiplexer 125 selects the R, G, B signals and the synchronization signal on the line L17 or the R, G, B signals and the synchronization signal on the line L18 based on the third selection signal on the line L19. Output on line L20.

As described above, the digital TV reception system provides a selection signal to the chroma demodulator 120, the first multiplexer 125, and the second multiplexer 130 according to each reception mode, thereby providing a digital broadcast channel digital signal. A broadcast signal, an analog broadcast signal of an analog broadcast channel, an external A / V signal, or an external PC signal is selected and outputted on the line L20.

When such a digital TV reception system operates in, for example, an A / V reception mode or a PC reception mode, the tuner 105 and the digital broadcast signal decoder 110 are in an idle state. Therefore, in the preferred embodiment of the present invention, when the digital TV reception system operates in the A / V reception mode or the PC reception mode, the tuner 105 and the digital broadcast signal decoder 110 in the idle state are used. To update the PSIP information.

Referring to FIG. 1, when the digital TV receiving system operates in the A / V receiving mode, for example, the system control unit 135 selects a first selection signal in a low state on a line L14 and a second selection in a low state on a line L16. Signal, providing a third selection signal in a high state on line L19, and if the digital TV receiving system acts, for example, in a PC reception mode, the system control unit 135 provides a third selection signal in a low state on line L19. In addition, the tuner 105 provides a control signal for detecting a default digital broadcast channel or a selected digital broadcast channel through the line L1.

The tuner 105 detects the packet stream carried on the digital broadcasting channel based on the control signal on the line L1, even though the digital TV receiving system operates in the A / V receiving mode or the PC receiving mode, and then digitally through the line L2. The broadcast signal decoder 110 is provided. The packet stream input to the digital broadcast signal decoder 110 is provided to the PSIP separation unit 114 via the channel decoder 112. The PSIP separation unit 114 detects only the PSIP information from the packet stream on the line L3 and provides the system control unit 135 through the line L4.

The system control unit 135 detects whether the EIT information is updated based on the EIT update determination data after detecting the EIT update determination data from the PSIP information on the line L4 even if the digital TV receiving system is in the A / V reception mode or the PC mode. When the EIT information is updated, the PSIP information stored in the memory 140 is deleted, and the PSIP information on the line L4 is newly stored in the memory 140.

As described above, the present invention detects the digital broadcasting channel while the digital TV receiving system is operating in the A / V receiving mode and the PC receiving mode, and updates the PSIP information from time to time, so that the channel switching to the digital broadcasting channel is faster. There is an effect that can be achieved.

Claims (2)

In digital broadcasting channel reception mode, it receives digital broadcasting signal loaded on digital broadcasting channel, receives A / V signal input from outside in A / V reception mode, and receives PC signal input from outside in PC reception mode. In the digital broadcast signal includes PSIP information, PSIP information updating method of a digital TV receiving system having a memory for storing the PSIP information in: Receiving a digital broadcast signal of the digital broadcast channel when the digital TV reception system is in an A / V reception mode or a PC reception mode; Separating the PSIP information included in the digital broadcast signal; Determining whether the separated PSIP information is updated information; If the separated PSIP information is updated information, deleting the PSIP information stored in the memory, and storing the separated PSIP information in the memory. The method of claim 1 wherein the PSIP information update method is: And detecting the update determination data included in the separated PSIP information to determine whether the separated PSIP information is updated information.