KR100718417B1 - Method for automatically modifying channel using gps information and tii database in a dmb receiver - Google Patents

Abstract

The present invention relates to an automatic channel setting method for automatically changing a channel map of a DMB receiver to a channel map of a changed transmitter using a GPS information and a transmitter information (T11) database when the transmitter changes when the DMB receiver moves. That is, in the present invention, in the channel scanning method of the DMB receiver, the position information of the current receiver is checked using GPS information, and the receiver is compared with each transmitter position information in the transmitter identification information (TII) database of the fast information channel. Moves to a different transmitter range, the channel map of the local transmitter is automatically set to the channel map of the receiver so that the channel scanning operation for the VHF frequency band according to the transmitter change is not necessary. It will save you time.

Description

METHODS FOR AUTOMATICALLY MODIFYING CHANNEL USING GPS INFORMATION AND TII DATABASE IN A DMB RECEIVER}

1 is a schematic block diagram of a DMB receiver to which an embodiment of the present invention is applied;

2 is a flowchart illustrating an automatic channel setting process using GPS location information and a TII database in a DMB receiver according to an embodiment of the present invention;

3 is a configuration diagram of a TII data format according to an embodiment of the present invention.

<Explanation of symbols for the main parts of the drawings>

100: RF modulator 102: baseband portion

104: FIG 106: MSG

108: multimedia processing unit 110: video and audio output unit

The present invention relates to digital multimedia broadcasting (DMB) service technology. In particular, when a transmitter is changed when a DMB receiver moves, GPS information and a transmitter identification information (TII) database are used. The present invention relates to an automatic channel setting method for automatically changing a channel map of a DMB receiver to a channel map of a changed transmitter.

In general, the term DMB refers to a service that has been renamed and used in Korea according to the ITU regulations that digital audio broadcasting (DAB) hereinafter includes video, text, etc. in addition to audio.

The DMB is an advanced system that not only provides users with completely digital information but also applies various frequencies in terms of quality and quantity. In addition, DMB can transmit voice programs and data programs at different data rates at the same time, and provides PAD (Program Associated Data) services that include data services in voice programs, and independently of text, graphics, and video. Non Program Associated Data (NPAD) services that provide programs are available. In particular, the NPAD service may be used to provide contents such as train and plane timetables, stock information, weather information, performance information, and news.

Such DMB receivers include PC (PC) card type, home audio type, and automobile type. The DMB receivers are classified into terrestrial broadcasting service and satellite broadcasting service according to the characteristics of the medium.

Broadcasting using satellite is to transmit video and audio signal produced by broadcasting station through transmitting earth station and send signal to remote receiving earth station by using satellite, which is a stationary satellite floating over the equator, as a repeater. A signal is transmitted from the terrestrial digital broadcasting earth station to the satellite, and the signal received from the satellite is downstream through the L-band.

In addition, in a broadcast system using terrestrial waves, a digital broadcasting station directly outputs a digital broadcast. Broadcast signals output by these two methods are received by mobile and fixed digital receivers.

Such a DMB system can be broadly classified into an out-of-band (EUREKA) -147 method jointly proposed in Pan-Europe and an in-band (IN-BAND) method proposed by the United States.

The dual Eureka-147 method uses a new frequency band other than the FM band in which analog broadcasting is provided, and features the use of the new frequency band and broadband transmission. In addition, the Eureka-147 system has a frequency band of 30 MHz to 3 GHz, that is, Very High Frequency (VHF), Ultra High Frequency (UHF), and L-band (1 to 2 GHz) / S-band; It can operate in the 2 ~ 4GHz) band (satellite broadcasting band), it is possible to broadcast terrestrial broadcasting through the current FM band and TV band and satellite broadcasting through the L / S band. Therefore, it is known to be the best DAB system developed to date because the frequency can be efficiently used through improved reception performance, high speed data transmission and single frequency network configuration due to broadband transmission.

In-band method is a method of sharing the frequency band used by the conventional analog broadcasting, and the IBOC (In-Band On-Channel) method for transmitting digital audio signal to AM or FM channel and the adjacent channel of FM channel. IBAC (In-Band Adjacent-Channel) method is proposed.

As described above, since the DMB has a multiplexed frame structure, there is an advantage in that multiple broadcasts (services) can be loaded and transmitted on one frequency channel.

On the other hand, the terrestrial DMB receiver has a merit that broadcast reception is possible even when moving as described above, whereas when a transmitter transmitting a signal changes while moving, for example, when changing from Gwanaksan transmitter to Namsan transmitter, the frequency of each service Since is changed, it is inconvenient to perform channel scanning again.

In other words, since channel scanning must be executed at the user's discretion, it may be cumbersome for the user.

Accordingly, an object of the present invention is to parse the transmitter identification information (TII) from the DMB transmission signal to extract receiver location information and automatically scan the channel in association with the GPS location information, thereby ensuring stable broadcast viewing. An automatic channel scanning method in a DMB receiver capable of serving the present invention is provided.

The present invention for achieving the above object is an automatic channel setting method using the GPS location information and transmitter identification information (TII) database in the DMB receiver, (a) receiving the location information according to the movement of the DMB receiver through the GPS module (B) parsing transmitter information (TII) from the digital multimedia broadcasting signal received by the receiver; and (c) comparing current position information of the DMB receiver with each transmitter position information in the transmitter information database. Searching for the corresponding transmitter in the region where the current receiver is located; and (d) if it is determined that the DMB receiver has moved to another transmitter range, the corresponding transmitter channel map of the moved region is automatically channeled to the channel map of the DMB receiver. It characterized in that it comprises a setting step.

Hereinafter, with reference to the accompanying drawings will be described in detail the operation of the preferred embodiment according to the present invention.

1 is a schematic structural block diagram of a DMB receiver for performing a method according to the present invention. The RF modulator 100, the baseband unit 102, the FIG 104, the MSG 106, the multimedia processing unit 108, The video and audio output unit 110 is included.

The RF modulator 100 is divided into a very high frequency (VHF) method and an ultra high frequency (UHF) method according to a frequency use band. The high frequency method is mainly configured to use several specific channels, and the ultra high frequency method is configured to use dozens or more channels. In the present embodiment, since the terrestrial DMB receiver employing a high frequency method is applied, the RF modulator 100 may be characterized as a high frequency RF modulator.

The baseband unit 102 is a means for accurately reproducing the high frequency signal of the terrestrial DMB RF modulator 100, and then the high frequency signal passing through the baseband unit 102 is converted into a predetermined intermediate frequency IF.

FIG (Fast Information Group) 104 serves as a tuner (Tuner) to tune the broadcast signal of the channel passing through the baseband unit 102, and applies the broadcast information of the tuned channel to the MSG (106). The GPS module receives the current location information of the DMB receiver and provides it to the multimedia processing unit.

The MSG 106 converts and demodulates the broadcast signal received from the FIG 104 into a digital form, and then separates the demodulated signal into an audio signal and a multimedia signal. The separated audio signal is decoded and output to the video and audio output unit 110, and the multimedia signal is applied to the multimedia processing unit 108, respectively.

The multimedia processor 108 includes an MPEG decoder for decoding multimedia data and a data decoder for decoding various data information to decode the multimedia signal applied from the MSG 106. In particular, the multimedia processing unit 108 controls the RF modulator 100 to perform automatic channel scanning according to transmitter identification information applied through the FIG 104 according to the present embodiment.

That is, the multimedia processing unit parses the transmitter identification information from the DMB signal tuned in FIG 104, compares the transmitter identification information of the current DMB receiver with the transmitter identification information of the previous frame in association with the position information received from the GPS module. If the current transmitter identification information and the transmitter identification information of the previous frame do not match, the RF modulator 100 is controlled to enable automatic channel scanning.

The video and audio output unit 110 converts the audio signal (or video signal) separated from the MSG 106 into an outputable signal and outputs the signal to the outside.

2 illustrates an automatic channel scanning operation control flow using GPS and TII information in a DMB receiver according to an embodiment of the present invention. Hereinafter, an embodiment of the present invention will be described in detail with reference to FIGS. 1 and 2.

First, when the DMB receiver is activated, the multimedia processing unit 108 proceeds from step S200 to step S202 to receive location information of the current receiver from the GPS module 112, and through FIG 104 in step S204. Parse the transmitter information (TII).

Subsequently, the multimedia processing unit 108 compares the current location information of the receiver received from the GPS module 112 with each transmitter location information of the TII database in step S206 to search for a corresponding transmitter of the region where the current receiver is located. .

That is, the TII information is inserted into the position information 300 of the transmitter in the TII data format as shown in FIG. 3, and the receiver is currently using the position information of the receiver identified through the transmitter position information and the GPS module 112. You will be able to find the transmitter in the area where you are located.

Accordingly, if it is determined that the multimedia processing unit 108 has moved to another transmitter range as a result of the location information check of the DMB receiver, the multimedia processing unit 108 proceeds to step S210 in response to this in step S208, and then the receiver moves in step S210. The channel map of the corresponding transmitter in the designated area is automatically scanned and applied to the channel map of the receiver.

As described above, in the present invention, in the channel scanning method of the DMB receiver, the position information of the current receiver is checked using GPS information, and the position information is compared with each transmitter position information in the transmitter information (TII) database of the high speed information channel. When the receiver moves to another transmitter range, the channel map of the local transmitter is automatically changed and set to the channel map of the receiver so that the channel scanning is not required for the VHF frequency band according to the transmitter change, and thus the channel scanning is performed in the DMB receiver. This can reduce the time required.

Meanwhile, in the above description of the present invention, specific embodiments have been described, but various modifications may be made without departing from the scope of the present invention. Therefore, the scope of the invention should be determined by the claims rather than by the described embodiments.

As described above, in the present invention, in the channel scanning method of the DMB receiver, the position information of the current receiver is identified using GPS information, and the position information of each transmitter in the transmitter information (TII) database of the fast information channel is determined. In comparison, when the receiver moves to another transmitter range, the channel map of the local transmitter is automatically changed to the channel map of the receiver so that the channel scanning operation of the VHF frequency band according to the transmitter change is not necessary. This has the advantage of reducing the time spent on.

Claims (1)

An automatic channel setting method using a GPS location information and a transmitter identification information (TII) database in a DMB receiver, (a) receiving location information according to the movement of the DMB receiver through a GPS module; (b) parsing transmitter identification information (TII) from the digital multimedia broadcasting signal received by the receiver; (c) searching for a corresponding transmitter in a region where the current receiver is located by comparing the current location information of the DMB receiver with each transmitter location information in a transmitter identification information (TII) database; (d) if it is determined that the DMB receiver has moved to another transmitter range, automatically setting a channel map of the corresponding transmitter channel of the moved region as a channel map of the DMB receiver; Automatic channel setting method using the GPS location information and the TII database in the DMB receiver.

Images