KR20030079548A - Method for changing channel of Digital TV - Google Patents

Abstract

PURPOSE: A method for converting channels of a digital TV is provided to input a channel selecting signal in a state that minor channel information belonging to a selected major channel in converting channels of the digital TV. CONSTITUTION: If a major channel selecting signal is inputted, it is judged whether the major channel selecting signal is a channel up/down signal(S101-S102). If so, the corresponding major channel is tuned(S105). If a major channel number is directly inputted, the corresponding major channel is tuned in a moment that an operator is continuously inputted after the major channel number(S103-S104). A PSIP(Program Service Information Protocol) table is parsed for extracting minor channel information belonging to the corresponding major channel(S106-S107). It is judged whether the number of minor channels is more than two(S108). Otherwise, video of one minor channel belonging to the corresponding major channel is displayed(S109). If so, numbers of all minor channels belonging to the selected major channels are displayed on a picture(S110). If the minor channel number is selected, video of the corresponding channel is displayed(S111-S112).

Description

Channel conversion method of digital TV {Method for changing channel of Digital TV}

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to digital TV (DTV), and more particularly, to a channel conversion method of digital TVs for facilitating channel conversion of digital TVs with major-minor channel information.

In general, North American digital TV broadcasting has established the digital broadcasting service standard through the Advanced Television Service Committee (ATSC), which is the US Digital Broadcasting Standards Committee. It provides channel number, video / audio stream information and program details.

Here, the PSIP is input as a stream having a PID (Packet ID) of 0x1FFB among digital streams, and the stream is analyzed as follows.

That is, MGT (System Time Table) that configures system time information, RRT (Rating Region Table) that configures regional grades information, and MGT (PID information) of PID information of EIT (Event Information Table) that configures detailed information of each program. Master Guide Table) and VCT (Virtual Channel Table) that configures information (number of channels, video / audio PID, etc.) about the actual digital channels in the RF channel.

Therefore, analyzing the VCT can identify the channel number appearing on the screen.

In addition, PSIP includes major-minor channel number, parental control information, digital TV caption information, earth time information, and extended program information. -It is characterized by using minor channel number allocation method.

This major-minor channel number uses a station number rather than an RF channel number as a major and allocates a minor channel number to implement multiple channels for one RF channel.

However, the ATSC assigns a specific value to each broadcaster for the major channel, whereas the minor channel number may change from time to time because the broadcaster manages the minor channel assignment.

Hereinafter, a channel conversion method of the digital TV of the prior art will be described.

First, after purchasing a digital TV receiver, the power is turned on and a channel map is constructed based on the RF connected to the current input terminal.

Once the channel map is configured, the user requests channel conversion to the receiver to perform channel conversion using the remote controller or the front panel.

The channel conversion request is performed by a user using a Up / Down key or directly inputting a channel number. Accordingly, the channel is displayed to the user.

In the case of NTSC in an analog system, the physical channel is the channel number specified by the Federal Communications Commission (FCC).

For example, only one broadcast channel is assigned to channel 2, and the RF frequency of channel 2 is always defined as a center frequency of 57 MHz and cannot be changed.

Digital broadcasting uses compression techniques for channel efficiency, and transmits one or more broadcast programs per channel, unlike analog broadcast, which delivers only one program per channel.

In an analog system, the channel is determined by the physical RF frequencies from 2 to 69, making it easy to construct a channel map.

However, in the case of digital TV, it has a different concept from the analog system. The channel switching method of the digital TV receiver will be described with reference to Table 1 below based on the terrestrial ATSC digital TV.

Assuming that the user is currently watching channel 11-3, when the user presses the channel Up key, the current receiver moves to number 12-2.

If you press 12-2, it moves to 12-2.

Configure the DTV Receiver Channel Map Actual live channel Major Minor Major Minor 7 7 One 7 2 10 10 3 11 11 One 11 2 11 3 12 12 2 12 3 12 5 99 99 One 99 2 99 999

However, assuming that the channel is moved to channel 12, the user does not know whether there are 2, 3, or 5 minor channels, so the user will press '12-1 'and press the' OK 'key.

The TV will then display nothing with the statement that there is no program.

However, the channel conversion method of the digital TV of the prior art has the following problems.

In the case of the digital TV of the channel expression method of the major-minor concept, it can be remembered in the case of the major channel, but in the minor channel that varies according to time zones and broadcasting programs, the user cannot remember the channel. Minor channel number information to be recorded in the map is changed from time to time.

This means that the major channel number can be entered correctly during channel conversion, but the minor channel number is not known or cannot be entered correctly.

The present invention is to solve the problems of the digital TV of the prior art, it is an object of the present invention to provide a channel conversion method of digital TV to facilitate the channel conversion of the digital TV with the major-minor channel information. .

1 is a flowchart illustrating a channel conversion method of a digital TV according to the present invention.

2 is a screen configuration diagram of the display state of the minor channel information of the digital TV according to the present invention

In the channel conversion method of the digital TV according to the present invention for achieving the above object, in the channel conversion of the digital TV with major-minor channel information, determining whether the channel up / down signal when the major channel selection signal is input; ; If the channel up / down signal, tune the corresponding major channel, and if the major channel number is directly input, tuning the corresponding major channel at the moment of continuous input of the division operator following the major channel number; Parsing the corresponding PSIP table Extracting minor channel information belonging to the terminal; determining whether the number of the minor channels is two or more by using the extracted channel information, and if the number of the minor channels is not two or more, displaying an image of the minor channel belonging to the corresponding major channel If the number of minor channels is two or more, And displaying the numbers of all the minor channels to which they belong, and if the minor channel numbers are selected using the same, displaying the image of the corresponding channel.

Hereinafter, with reference to the accompanying drawings will be described in detail with respect to the channel conversion method of the digital TV according to the present invention.

1 is a flowchart illustrating a channel conversion method of a digital TV according to the present invention, and FIG. 2 is a screen configuration diagram of a display state of the minor channel information of the digital TV according to the present invention.

In the channel conversion method of the present invention, when a user inputs a major channel number and '-', the receiver moves to a major channel number existing on a channel map. At this time, the transport decoder receives a transport stream and receives a minor channel. Get information and display minor channel numbers that exist in the current major channel.

At this time, the user can view several minor channel numbers (displayed on the screen) existing in the major channel selected by the user, and select the desired channel.

Here, in the step of obtaining the minor channel information, in case of ATSC, TVCT or CVCT information is obtained, the table is parsed to obtain minor channel information, and then the minor channel number is displayed on the screen.

In the channel conversion method according to the present invention, as shown in FIG. 1, when a user inputs a major channel selection signal using a remote controller or a front panel (S101), it is determined whether the input channel selection signal is a channel up / down signal. (S102)

In the case where the channel selection signal inputted as the result of the determination is not a channel up / down signal and directly inputs a major channel number, for example, when the selected major channel number is 12, '12-'is input (S103). Distinction operator between channel number and minor channel number For example, at the moment '-' is inputted, the corresponding major channel is tuned to the corresponding RF frequency.

If the input channel selection signal is a channel up / down signal, the corresponding major channel is tuned to the corresponding RF frequency (S105), and the stream compressed by the transport decoder, that is, PSIP (Program Service) Information Protocol) Parsing the table (S106).

In this manner, after parsing the PSIP table, the minor channel information is obtained by analyzing a Terrestrial Virtual Channel Table (TVCT) table having information on the number and channel numbers of the minor channels.

Subsequently, it is determined whether the number of the minor channels belonging to the corresponding major channel is two or more using the obtained minor channel information.

If the number of the minor channels is one or more than two, the image of the minor channel belonging to the selected major channel is displayed (S109).

If it is determined that the number of the minor channels is two or more, the minor channel number belonging to the selected major channel is displayed on the screen.

Next, the user checks and selects the minor channel number displayed on the screen.

When the minor channel is selected by the user and the channel setting is completed, the image of the corresponding minor channel is displayed (S112).

Here, when there is only one minor channel belonging to the selected major channel, the channel may be changed immediately at the moment when the major channel is selected in consideration of the channel conversion speed.

In addition, when using a remote controller capable of transmitting and receiving a channel conversion signal, the major channel number and the minor channel number can be displayed through an LCD (Liquid Crystal Display) window configured in the remote controller.

A case of converting a channel of a digital TV using the channel conversion method of the present invention will be described below.

As shown in FIG. 2, RF tuning is performed in the same manner as when the user presses '12-'and the tuner unit receives a signal from the corresponding RF of the corresponding major channel, and the transport decoder receives the TVCT or If the cable is not terrestrial, the cable virtual channel table (CVCT) is parsed.

At this time, the information of the minor channel number (minor_channel_number) is read.

In this process, the minor channel number existing in the current major channel is known from the TVCT table and displayed on the screen as shown in FIG. 2.

In this case, the displayed position, letter form, size, and the like may vary.

As such, when the user inputs '12-'to display the minor channel information of the major channel 12 on the screen, the user moves to the desired channel among the minor channels 1, 3, and 5.

To select a minor channel, use the Up / Down keys or press one of the 1, 3 or 5 displayed on the screen.

PSIP sends the name of each minor channel in the form of short_name, and if necessary, it can show the short name of each minor channel or program information currently being broadcast for each minor channel.

If the system to which the present invention is applied is an analog broadcasting system, the NTSC channel number may be expressed as '-0', such as '12 -0 '. In this case, the number 12 or '12 -0' is used for the user. Input will send analog broadcast.

The channel conversion method of the digital TV according to the present invention displays the minor channel information belonging to the selected major channel during the channel conversion of the digital TV having a minor channel which is too large for the user to remember and varies according to time zones or broadcast programs. In this state, the channel selection signal input is made so that the user's convenience and accurate channel setting are possible.

Claims (1)

In channel conversion of digital TV with major-minor channel information, Determining whether the channel up / down signal is input when a major channel selection signal is input; Tuning the corresponding major channel if the channel up / down signal is input, and tuning the corresponding major channel at the instant of continuous input of the division operator following the major channel number if the major channel number is directly input; Parsing the PSIP table to extract minor channel information belonging to the corresponding major channel; Determining whether the number of the minor channels is two or more by using the extracted channel information, and if the number of the minor channels is not two or more, displaying an image of the minor channel belonging to the corresponding major channel; If the number of the minor channels is 2 or more, display the numbers of all minor channels belonging to the selected major channel, and if the minor channel number is selected using the same, displaying the image of the corresponding channel. Channel conversion method.