KR100755837B1 - Multi-tuning system in display device and method for Multi-tuning using the same - Google Patents

Abstract

The present invention relates to a multi-tuning system and a multi-tuning method using the same in a video device capable of automatically tuning a channel used in all countries by using a tuner including a frequency band used in all countries. The invention provides a tuner for scanning broadcast channel frequencies; A memory unit configured to scan the broadcast channel frequency and store channel information and frequency information of a Forward Error Correction (FEC) locked frequency for correcting a residual error after synchronization and equalizer processing; And a control unit configured to control scanning of all broadcast channel frequencies through the tuner and to provide a broadcast channel using the channel information and the frequency information of the stored frequencies as channel maps. To provide. Therefore, according to the present invention, since channel information in a frequency band used in all countries can be found or stored regardless of the frequency table, for example, a minimum digital TV can be viewed between countries adopting a DVB system. There is.

Multi tuning

Description

Multi-tuning system in display device and method for multi-tuning using the same

1 is a block diagram illustrating a multi-tuning system in a video device according to the present invention.

2 is a flowchart illustrating a multi-tuning method in an image device according to the present invention.

* Description of the symbols for the main parts of the drawings *

10 tuner and channel decoder 20 data processor

30: scaler 40: display

50: memory 60: control

The present invention relates to frequency tuning, and more particularly, to a multi-tuning system in a video device capable of automatically tuning a channel used in all countries by using a tuner including a frequency band used in all countries, and a multi-use using the same. It is about a tuning method.

Digital TV refers to a TV that receives (or transmits) a digital signal rather than a conventional analog broadcasting signal. In a broader sense, it is commonly used as a meaning including a broadcasting system serviced through a digital band and various additional services that may be accompanied.

Such digital TVs are produced using digitalized equipment from the production stage of broadcast contents, and thus, when receiving a broadcast, the digital TV is more resilient than the analog method, thereby enabling high quality screen, sound, and additional data services.

In the digital method, the screen and audio are compressed, encoded, and then multiplexed and transmitted as a single data stream, and the receiver receives them and corrects all errors. Demultiplexing & Decoding.

Such a method of transmitting (decoding / encoding) digital TV signals varies according to each country, and is largely divided into the ATSC method in the US and the DVB method in Europe.

Advanced Television Systems Committee (ATSC) is a US standard.

In addition, DVB (Digital Video Broadcasting) is a method adopted in Europe, and the United States and Europe independently have established their own standards and established the DVB method based on analog PAL method. There are also various types of products, which have an advantage in providing detailed services. In addition, it is suitable for mountainous terrain, so it is excellent in indoor reception and movement and has strong points in satellite service.

The characteristic of the European DVB method is COFDM (coded orthogonal frequency division multiplexing) method, and the transmission rate is variable (per second, depending on the parameter adjustment, the maximum transmission rate is 28 ~ 9Mbps at 7Mbps of DVD level. 23Mbps transmission is possible).

Looking at the current status of digital TV (DTV) broadcasting in Korea, after the pilot broadcast in 2000, the metropolitan area is performing main broadcasting in 2002, the metropolitan area is scheduled for 2004, and all the DTV broadcasting conversion will be completed by 2010. Is expected.

Looking at the difference between the conventional channel allocation method of analog TV and DTV, in the case of analog TV, only analog channels are searched for and store channel information, while in the case of DTV, analog channels are mixed in a broadcasting environment where analog broadcasting and digital broadcasting are mixed. It should be able to search both and digital channels to store channel information and then display both analog and digital channels according to the viewer's selection conditions.

In addition, the existing analog TV and DTV has a difference in the channel operation method, analog TV is the same broadcast in the Seoul area and the province, but the channel is different from each other by watching TV with each channel transmitted from the transmission station in each region Therefore, when a viewer wants to watch a certain broadcast, he or she must know the channel number of the corresponding broadcaster.

On the other hand, in the case of DTV, the channel is selected and watched by a virtual channel number determined for each broadcasting station separately from the physical channel of the transmitting station. With the concept of virtual channel, the same broadcasting station channel is the same anywhere in the country, so the viewer does not know the physical channel. Because only the virtual channel needs to be known, convenience can be achieved.

Currently, countries adopting DVB system have different frequency bands and different frequency tables are used depending on the system. So far, countries have specific frequency tables and frequency bands. It has been developed in the form of limited use.

However, the digital TV according to the related art has the following problems.

First, in the case of domestic use, there is a problem of knowing the frequency table of each country from the time of manufacture, as well as the full-band frequency and the per-channel frequency band corresponding to the beginning and end of each country. Had to continue to collect.

Secondly, if you are moving or moving to an expensive country, you can bring it to the country. If the country's full-band frequency range is different, you will not be able to watch for a particular channel. TV watching itself could be impossible.

Third, a separate TV had to be purchased if the frequency band of each neighboring country or the frequency band per channel were different.

SUMMARY OF THE INVENTION The present invention has been made to solve the above problems, and an object of the present invention is to use a tuner including a frequency band used in all countries, and to perform multi-tuning in an image device capable of automatically tuning channels in all countries. It is to provide a system and a multi tuning method using the same.

In order to achieve the above object, the present invention provides a tuner for scanning a broadcast channel frequency; A memory unit configured to scan the broadcast channel frequency and store channel information and frequency information of a Forward Error Correction (FEC) locked frequency for correcting a residual error after synchronization and equalizer processing; And a control unit configured to control scanning of all broadcast channel frequencies through the tuner and to provide a broadcast channel using the channel information and the frequency information of the stored frequencies as channel maps. To provide.

In addition, to achieve the above object, the present invention comprises the steps of performing a scan for the frequency in all broadcast channel frequency bands and storing the channel information and frequency information of the locked (lock) frequency as the current frequency; Generating a channel map using channel information and frequency information of the stored frequency; And it provides a multi-tuning method in the video device comprising the step of providing a broadcast channel using the generated channel map.
Setting a start frequency and a end frequency band for scanning all the broadcast channel frequency bands; Setting a corresponding national channel frequency band of the frequency band to be scanned; And setting a transmission mode parameter of the frequency band to be locked.

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Therefore, according to the present invention, since channel information in a frequency band used in all countries can be found or stored regardless of the frequency table, for example, a minimum digital TV can be viewed between countries adopting a DVB system. .

Other objects, features and advantages of the present invention will become apparent from the following detailed description of embodiments taken in conjunction with the accompanying drawings.

Hereinafter, with reference to the accompanying drawings, preferred embodiments of the present invention that can specifically realize the above object will be described.

1 is a block diagram illustrating a multi-tuning system in a video device according to the present invention.

The multi-tuning system of the video device according to the present invention comprises a tuner and a channel decoder 10, a data processor 20, a scaler 30, a display 40, a memory 50 and a controller 60. It is configured to include.

Here, the tuner and channel decoder 10 decodes a tuner for tuning a channel desired by a user from a RF signal input from an antenna (not shown) and a broadcast signal input through the tuned channel in the form of a transport stream.

The data processor 20 encodes and / or decodes data to be reproduced and stored in the form of the transport stream.

The scaler 30 scales the image data among the decoded data according to the resolution.

The display unit 40 displays image data scaled according to the resolution.

The memory unit 50 stores channel information of channels tuned through the tuner.

The controller 60 searches for the full band frequency and scans a channel in the found frequency band to store each channel information.

Here, the tuner of the tuner and the channel decoder 10 uses a tuner of 8 MHz band.

In other words, the tuner in the multi-tuning system according to the present invention uses different frequency bands in different countries depending on the system that adopts the DVB system and different frequency tables. In order to solve the problem that the table and frequency band are developed to be limited to a specific country, the 8M band tuner is used to search all bands so that channels can be found regardless of the frequency table. Channel search and scan are available to enable digital TV viewing among all countries adopting the system.

In addition, according to the scan result, the FEC (Forward Error Correction) locked frequency, which corrects residual errors after synchronization and equalizer processing, is stored in the memory unit, and the predetermined frequencies are sequentially tuned. Save channel information to use as channel map.

2 is a flowchart for describing a multi-tuning method in an image device according to the present invention.

In the multi-tuning method of a video device according to the present invention, first, a user sets a multi-tuning mode through a menu function of a video device (for example, a digital TV), and starts a frequency band to search (start and search). Frequency band) is set (S10).

Subsequently, the frequency band of the current country is set (S20). At this time, a frequency band for each channel (for example, one of 6 MHz, 7 MHz, and 8 MHz) is set for each country.

Next, a transmission method parameter is set (S30). For example, an orthogonal frequency division multiplex (OFDM) can be set as a transmission method parameter.

Of course, such a frequency band and channel frequency band and transmission method parameter for each country to be searched may be automatically performed when a specific country code is input.

Subsequently, a scan of the frequency is started (S40), and it is determined whether there is a frequency locked by the FEC (Forward Error Correction) that corrects residual errors after the synchronization and equalizer processing according to the scan result (S50). .

As a result of determination (S50), if there is a FEC locked frequency, it stores the current frequency.

However, in the case where there is no FEC locked frequency (S50), it is determined whether a scan of the entire frequency band is performed (S60).

As a result of the determination (S60), when scanning is performed for the entire frequency band, the stored frequencies are tuned in sequence (S80).

Subsequently, the channel information of the tuned frequencies is sequentially stored (S90).

Then, it is determined whether the channel information storage is completed (S100), and when it is completed, it ends.

In the multi-tuning system and the multi-tuning method using the same in the video apparatus of the present invention described above, the following effects are obtained.

First, even if each country does not know the frequency table can be configured a frequency table.

Second, you can watch TV even if you travel with expensive digital TV.

Third, there is no need to purchase a separate TV even if the frequency band of the neighboring country or the frequency band per channel is different.

Those skilled in the art will appreciate that various changes and modifications can be made without departing from the spirit of the present invention.

Therefore, the technical scope of the present invention should not be limited to the contents described in the embodiments, but should be defined by the claims.

Claims (6)

A tuner for scanning a broadcast channel frequency; A memory unit configured to scan the broadcast channel frequency and store channel information and frequency information of a Forward Error Correction (FEC) locked frequency for correcting a residual error after synchronization and equalizer processing; And And a control unit configured to control scanning of all broadcast channel frequencies through the tuner and to provide a broadcast channel using the channel information and the frequency information of the stored frequencies as channel maps. delete delete Performing a scan on frequencies in all broadcast channel frequency bands and storing channel information and frequency information of locked frequencies as current frequencies; Generating a channel map using channel information and frequency information of the stored frequency; And And providing a broadcast channel using the generated channel map. The method of claim 4, wherein Setting a start frequency and a end frequency band for scanning all the broadcast channel frequency bands; Setting a corresponding national channel frequency band of the frequency band to be scanned; And setting a transmission method parameter of the frequency band to be locked. delete

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