KR100326288B1 - Tuning Frequency Detection Method for Digital Broadcast Receiver - Google Patents

Abstract

The present invention relates to a tuning frequency detection method for receiving digital broadcasting, and more particularly, to a tuning frequency detection method of a digital terrestrial television (hereinafter referred to as "DTTV") capable of multiple network reception. The present invention provides a mode determination step of determining whether a cold boot mode is initially supplied with power, or a warm boot mode where power is supplied after a cold boot is executed. Scan the UHF band and configure the frequency list that contains the channel frequency information (ID) of the receivable UHF band and the information (ID) of the transport stream (TS). Storing the list separately; receiving a channel selection signal from a user; determining whether there is a matching UHF ID in the frequency list through a transport stream ID to which the program selected according to the channel selection signal belongs; If there is a matching UHF ID, tune to the corresponding UHF channel, and if there is no matching UHF ID, tune in sequence using Service Information (SI). Is achieved. Therefore, the present invention has the effect of quickly finding the corresponding tuning frequency of the program by simultaneously using the channel frequency list configured in the cold boot mode to which power is first applied and the service information (SI) of the transport stream.

Description

Tuning Frequency Detection Method for Digital Broadcast Receiver

The present invention relates to a tuning frequency detection method for receiving digital broadcasting, and more particularly, to a tuning frequency detection method of a digital terrestrial television (hereinafter referred to as "DTTV") capable of multiple network reception.

Digital video broadcasting (DVB) refers to a digital broadcasting standard developed jointly by European countries, and digital television receives TV broadcasts transmitted digitally. In general, digital broadcasting of satellite DVB-S systems is commercially available in many countries. In the case of digital broadcasting (DVB-S) using a satellite, a transponder allocates an intermediate frequency (IF) of a specific band and multiplexes one transport stream (TS). Send it. Multiple transponders can be grouped into specific "networks". Digital information (DVB) service information (SI) provides information about the internal components necessary to form a specific "network." Transmit with audio and video data according to the standard.

However, terrestrial digital broadcasting is composed of a plurality of networks, and a network that can be received is determined by the strength of radio waves. Terrestrial digital broadcasting (DVB-T) signal transmission uses the ultra high frequency (UHF) band used in the conventional analog broadcasting. Unlike the DVB-S, the DVB-T adopts a multiple frequency network (MFN) method in which each multiplexer for the entire network is branched and broadcast in multiple UHF bands. Therefore, in the unidirectional tuning using the service information (DVB-SI) of digital broadcasting, tuning frequency information, which cannot be actually received due to regional characteristics, may be loaded together in the service information (DVB-SI). Also, among the signals sent from the various UHF bands, there may occur a case where tuning to a frequency where the signal strength is likely to be low.

Accordingly, an object of the present invention is to use a frequency list configured in the boot mode of a terrestrial digital TV broadcasting (DVB-T) set and service information (SI) carried in a transport stream (TS) at the same time to speed up the tuning frequency of a program. The present invention provides a tuning frequency detection method for a digital broadcast receiver that can be found.

1 is a view showing a tuning frequency detection device to which the present invention is applied,

2 is a view for explaining a tuning frequency detection method according to an embodiment of the present invention.

※ Explanation of codes for main parts of drawing

11: Tuner part 12: EEPROM

13: demultiplexer and control unit 14: system memory

15: MPEG A / V Decoder

A feature of the present invention for achieving the above object is a method for searching for a tuning frequency for receiving a digital broadcast signal, (1) whether the cold boot (cold boot) mode is first powered on, Mode determination step of determining whether or not the warm boot (warm boot) mode is applied, (2) If the cold boot mode, the channel frequency information (ID) for the UHF band that can be received while scanning the entire microwave (UHF) band And a frequency list including information (ID) of the transport stream (TS), and separately storing the instrumented frequency list in the warm boot mode (3) receiving a channel selection signal from a user Step (4) Determining whether there is a matching UHF ID in the frequency list through the transport stream ID to which the program selected according to the channel selection signal belongs, and (5) If there is a matching UHF ID, the tuning frequency search method includes tuning to a corresponding UHF channel, and if there is no matching UHF ID, sequentially tuning using a network information table (NIT) of system information (SI). .

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

1 is a view for explaining a tuning frequency detection device to which the present invention is applied.

The tuner unit 11 scans the entire UHF band by an application programming interface (API) which is a software module. The demultiplexer and the control unit 13 store in the EEPROM 12 a frequency list of the receivable UHF bands among the entire UHF bands scanned by the tuner unit 11. The system memory 14 receives and stores a frequency list stored in the EEPROM 12. In addition, the demultiplexer and the control unit 13 separate the received digital signal into video data, audio data and other data. The MPEG A / V decoder 15 decodes and outputs separated video, audio and other data.

2 is a view for explaining a tuning frequency detection method according to a preferred embodiment of the present invention.

The demultiplexer and the control unit 13 are a warm boot which is executed when the user purchases a set and is in a cold boot mode to which the power is initially applied, or when the user moves or changes the network environment to reconfigure the channel list. It is determined based on a flag of the EEPROM 12 (step 210). In the cold boot mode, no data is recorded in the EEPROM 12. Therefore, the demultiplexer and the control unit 13 determine the mode of the current DTTV set as the colt boot mode based on the flag of the EEPROM 12 informing this. On the other hand, when there is data recorded in the EEPROM 12, a flag different from that in the colt boot mode occurs, and the demultiplexer and the control unit 13 determine the mode of the current DTTV set as the warm boot mode based on this.

First, the tuning method when it is determined to be in cold boot mode will be explained. The tuner unit 11 performs an automatic channel search (ACS) by using an application programming interface (API), which is a software module, to scan the entire UHF band. The demultiplexer and the control unit 13 include channel frequency information ID for all UHF bands that are receivable in the tuner unit 11 and information ID for a transport stream TS currently being received. Construct a frequency list. The user selects a program to be received using a user interface, for example, the OSD of the program guide (EPG) shown on the screen in the case of digital broadcasting (step 230). The demultiplexer and the controller 13 determine whether there is a UHF ID corresponding to a program selected by the user from the frequency list stored in the EEPROM 12 (step 240). That is, it is determined whether there is a UHF ID corresponding to the program selected by the user through the transforce stream ID to which the program selected by the user belongs. If there is a matching UHF ID, tune the channel (step 250). However, if there is no matching UHF ID, it is determined that a change has occurred in the network configuration and tuning is performed using the data field of the frequency list of the network information table (NIT) of the DVB-SI (step 260).

In the warm boot mode, that is, the demultiplexer and the control unit 13 read the frequency list configured in the cold boot mode described above from the EEPROM 12 and store it in the system memory 14 (step 270). This is to increase the access speed in the software module of the user interface when the decoder is running. When the program selection signal is input through the user interface using the program guide (EPG) (step 280), the multiplexer and the control unit 13 searches for the frequency list stored in the system memory 14 (step 290). Thereafter, the method for tuning the channel selected by the user is the same as the operation after step 240 described above.

As described above, the present invention has the effect of quickly finding the corresponding tuning frequency of the program by simultaneously using the channel frequency list configured in the cold boot mode to which power is first applied and the service information (SI) of the transport stream.

Claims (2)

In the method for searching a tuning frequency for receiving a digital broadcast signal, (1) a mode determining step of determining whether a cold boot mode is initially applied to a power or a warm boot mode to which power is supplied after a cold boot is executed; (2) In the cold boot mode, a frequency list including channel frequency information (ID) for the receivable UHF band and information (ID) for the transport stream (TS) is scanned while scanning the entire microwave (UHF) band. Configuring and separately storing the instrumented frequency list in the warm boot mode; (3) receiving a channel selection signal from a user; (4) determining whether there is a matching UHF ID in the frequency list through a transport stream ID to which a program selected according to the channel selection signal belongs; And (5) a tuning frequency search method comprising tuning to a corresponding UHF channel if there is a matching UHF ID, and sequentially tuning using service information (SI) if there is no matching UHF ID. [2] The method of claim 1, wherein the step (2) stores separately the frequency list configured in the cold boot mode to increase the access speed in the user interface module in the warm boot mode.