KR20050021799A - Wireless Communicaiton Terminal has the function of Receiving Digital Mutimedia Broadcasting and its Method - Google Patents

Abstract

PURPOSE: A mobile terminal having a digital multimedia broadcast reception function and its method are provided to reduce an expensive service use charge incurred for using a VOD(Video On Demand) service by a mobile terminal and a telephone charge. CONSTITUTION: A key input unit(310) receives a digital multimedia broadcast reception command. A channel selector(302) selects a channel of the digital multimedia broadcast. A digital multimedia broadcast processor(303) receives an analog broadcast signal of the selected channel, converts it into a digital signal, and corrects an error. An image broadcast signal processor(304) decodes the digital image broadcast signal according to an MPEG method. A voice CODEC(307) converts the digital voice broadcast signal and the decoded digital voice signal into analog signals. A voice output unit(308) outputs the analog voice signals. An LCD(309) displays the decoded image signal. A calculation/control unit(305) controls each element according to the digital multimedia broadcast reception command to receive the digital multimedia broadcast.

Description

Wireless communication terminal having digital multimedia broadcasting reception function and its method {Wireless Communicaiton Terminal has the function of Receiving Digital Mutimedia Broadcasting and its Method}

The present invention relates to a wireless communication terminal having a digital multimedia broadcasting reception function and a method thereof, and more particularly, to receive a digital multimedia broadcasting and to receive the digital multimedia broadcasting by a wireless communication terminal without receiving a separate receiver. A wireless communication terminal having a digital multimedia broadcasting reception function and a method thereof are provided.

In the present invention, the wireless communication terminal is a mobile communication terminal, a personal communication service (PCS) terminal, a personal digital assistant (PDA), a smart phone, a next generation mobile communication (IMT-2000) terminal, a wireless LAN terminal, and the like through wireless communication, A portable terminal capable of transmitting and receiving text and video data.

On the other hand, digital multimedia broadcasting (hereinafter referred to as "DMB") is a broadcasting service that provides various multimedia signals such as audio and video to a fixed, portable, and vehicle receiver digitally. . System A follows the European Digital Broadcasting Standard (OFDM: Orthogonal Frequency Division Multiplexing) of digital satellite broadcasting and terrestrial DMB, and system Dh is based on terrestrial DMB but adopts a hybrid scheme to accommodate satellite DMB. The code division multiple access (CDM) scheme is almost identical to the division multiple access (CDMA).

Terrestrial digital multimedia broadcasting (DMB) has already been allocated to channel 12 of the ultra-high frequency (VHF) band corresponding to 174MHz to 216MHz of television channels 7 to 13. Channel 12 is further divided into three frequency blocks (multiplexers), which can allocate bandwidth of 1.54 Mbps per block. With this bandwidth, one video channel and three audio and data channels can be accommodated. Thus, a bandwidth of one channel (VHF No. 12) of an analog TV can accommodate three video channels and nine audio and data channels. As such, terrestrial DMB can use digital technology to significantly increase frequency efficiency.

Terrestrial DMB conforming to the European standard 'Eureka-147' technology standard is robust to the effects of multipath fading, a characteristic of the mobile environment transmission channel, and can be received without deterioration of performance in order to provide various services stably even when moving. Orthogonal Frequency Division Mutiplexing (OFDM) is used. In addition, the frequency efficiency is high by applying a compression method called MPEG 4, which has a higher compression efficiency than MPEG 2 of terrestrial digital television.

The attractiveness of terrestrial DMB services to existing broadcasters is that they can be serviced without spending a lot of money. In other words, if the existing broadcasting program is used as content, and only essential facilities such as a transmission facility are provided, DMB radio waves can be transmitted anywhere in the metropolitan area through the existing Gwanaksan transmission tower.

On the other hand, satellite DMB is serviced in the 2.630 ~ 2.655 ㎓ band corresponding to the ultra-high frequency (UHF), which is much higher than the terrestrial wave. If the terrestrial DMB covers the metropolitan area by launching radio waves from the Gwanaksan transmitting station, the satellite DMB is capable of broadcasting nationwide at once by launching radio waves toward the Korean Peninsula from satellites outside the atmosphere. In the service flow chart using satellites, Ku-Band will start with various contents such as news, music videos, sports, movies, dramas, songs, jazz, foreign languages, securities, transportation, weather, etc. Transmit to satellite via frequency (13.824 ~ 13.883 GHz). The satellite then transmits it to the terrestrial terminal via the S-band (2.630-2.655 GHz) allocated for DMB. If it is not possible to receive satellite signals directly, a terrestrial repeater called 'Gap Filler' relays broadcast signals, allowing the user to use the DMB service anytime and anywhere.

And, the advantage of satellite DMB is that it can accommodate much more various channels than terrestrial DMB as it is relatively high frequency, and nationwide broadcasting is possible at one time. In the case of terrestrial DMB, only the metropolitan area will be available for a while. The Eureka-145 technical standard adopts the Single Frequency Network (SFN) method, which enables nationwide broadcasting on a single frequency without changing the frequency depending on the region, but the problem is that VHF No. 12 for terrestrial DMB is already different in the province. As it is used for broadcasting purposes, it will take considerable time before it is emptied through digital conversion. Accordingly, the service area of satellite DMB, which can send multimedia signals to all over the country from satellites 144 degrees long, is much wider than terrestrial DMB.

In addition, the Korea Broadcasting Commission is expected to lower the number of compulsory channels discussed in the case of satellite DMB and mandate more than 10 video channels. Satellite DMB currently has a business plan to accommodate 27 to 40 channels in total, including audio and data channels, including 10 to 12 video channels. One multiplex of terrestrial DMB can accommodate about four channels, including one video, with a much wider range of services.

1 is a block diagram of an embodiment of a conventional digital multimedia broadcasting receiving terminal.

As shown in FIG. 1, the conventional digital multimedia broadcasting receiving terminal includes a channel selection unit 101, a digital multimedia broadcasting processing unit 102, a video broadcasting signal processing unit 103, a control unit 104, a storage unit 105, An audio codec 106, an audio output unit 107, and a screen display unit 108 are included.

Looking at the operation, the channel selector 101 selects a channel that the user wants to receive from the digital multimedia broadcasting received from the antenna. Then, the digital multimedia broadcasting processing unit 102 converts the received digital multimedia broadcasting signal selected by the channel selecting unit 101 into a digital signal and corrects an error. The video broadcast signal is output to the video broadcast signal processor 103 among the broadcast signals converted into the digital signal by the digital multimedia broadcast processor 102, and the audio broadcast signal is output to the voice codec 106.

The digital video broadcast signal input to the video broadcast signal processor 103 is decoded by the MPEG method, and the decoded digital audio signal is output to the voice codec 106.

Then, the voice codec 106 converts the voice broadcast signal converted into a digital signal by the digital multimedia broadcast signal processor 102 and the digital voice signal decoded by the video broadcast signal processor 103 into an analog signal.

The digital video broadcasting signal processed by the video broadcasting signal processing unit 103 is displayed on the screen display unit 108, and the audio broadcasting signal and the audio signal converted into an analog signal by the audio codec 106 are output to the audio output unit ( 107).

2 is a block diagram of an embodiment of a wireless communication terminal providing a conventional video on demand service.

As shown in FIG. 2, a conventional wireless communication terminal providing a video service on demand includes a wireless transmitter / receiver 201, arithmetic / control unit 202, a key input unit 203, a decoder 204, and a storage unit 205. ), A voice codec 206, a voice output unit 207, and a screen display unit 208.

Referring to the operation, when the operation / control unit 202 of the wireless communication terminal receives the on-demand video request command through the key input unit 203, the on-demand video request command is transmitted to the base station through the wireless transmission / reception unit 201. Then, the base station sends a request signal to the on-demand video server, receives the desired on-demand video data from the on-demand video server and transmits it to the wireless communication terminal.

Then, the operation / control unit 202 transmits the video-on-demand signal received through the wireless transceiver 201 to the decoding unit 204, and the decoding unit 204 decodes the video-on-demand signal in an MPEG manner. do.

The voice signal decoded by the decoder 204 is converted into an analog signal by the voice codec 206 and output through the voice output unit 207, and the video signal decoded by the decoder 204 is displayed on the screen. It is displayed on the display unit 208. At this time, all the processes of receiving and processing the video signal on demand are performed under the control of the operation / control unit 202.

However, one of the biggest complaints of consumers using video on demand (VOD) services is overly high service fees. Downloading a music video from a recently released wireless terminal costs more than tens of thousands of won. In fact, when using multiple multimedia services, the information usage fee and call charges are several hundred thousand won.

In the case of using the multimedia service as described above, the user has to purchase an expensive multimedia reception-only terminal separately or use an on-demand video service that pays expensive information and call charges.

The present invention has been proposed to solve the above problems, a wireless communication terminal having a digital multimedia broadcasting reception function to receive and watch digital multimedia broadcasting with a wireless communication terminal without receiving the digital multimedia broadcasting with a separate receiver; The purpose is to provide a method.

According to an aspect of the present invention, there is provided a wireless communication terminal having a digital multimedia broadcasting reception function, comprising: input means for receiving a digital multimedia broadcasting reception command; Channel selecting means for selecting a channel of a digital multimedia broadcasting received through an antenna; Digital multimedia broadcasting processing means for receiving an analog broadcasting signal of a channel selected by the channel selecting means, converting the digital broadcasting signal into a digital signal, and correcting an error; Video broadcast signal processing means for decoding the video broadcast signal converted into a digital signal by the digital multimedia broadcasting processing means by an MPEG method; Voice coding / decoding means for converting the voice broadcast signal converted into a digital signal from the digital multimedia broadcasting processing means and the digital voice signal decoded from the video broadcasting signal processing means into an analog signal; Speech output means for outputting an analog speech signal converted by the speech coding / decoding means; Screen display means for displaying a video signal decoded into an MPEG signal by the video broadcast signal processing means; And computing / control means for receiving the digital multimedia broadcasting by controlling the respective components according to the digital multimedia broadcasting reception command input through the input means while performing a wireless communication function.

On the other hand, the method of the present invention, in the method for receiving a digital multimedia broadcasting in a wireless communication terminal, comprising: a first step of starting a digital multimedia broadcasting reception control function according to a digital multimedia broadcasting reception request signal received through a key input unit; Controlling a channel selector to select a channel of a digital multimedia broadcasting received through an antenna; A third step of the digital multimedia broadcasting processing unit decoding the digital multimedia broadcasting selected by the channel selecting unit and converting the digital multimedia broadcasting into a digital signal; A fourth step of the video broadcasting signal processing unit decoding the digital signal converted by the digital multimedia broadcasting processing unit in an MPEG method; A fifth step of converting the audio signal decoded by the video broadcasting signal processor into an analog signal using a voice codec; And outputting a video broadcast signal decoded by the video broadcast signal processor and an analog audio signal converted by the audio codec.

The above objects, features and advantages will become more apparent from the following detailed description taken in conjunction with the accompanying drawings. Hereinafter, exemplary embodiments of the present invention will be described in detail with reference to the accompanying drawings.

3 is a block diagram of an embodiment of a wireless communication terminal having a digital multimedia broadcasting reception function according to the present invention.

As shown in FIG. 3, a wireless communication terminal having a digital multimedia broadcasting reception function according to the present invention includes a wireless transmission / reception unit 301, a channel selector 302, and a digital multimedia broadcasting processing unit (OFDM / FEC / Data Codec). 303, video broadcast signal processing unit 304, arithmetic / control unit 305, storage unit 306, audio codec 307, audio output unit (speaker) 308, screen display unit (LCD) 309, a key input unit 310.

Referring to the operation, when the operation / control unit 305 of the wireless communication terminal receives the digital multimedia broadcasting reception command through the key input unit 310, it starts to control each component according to the received digital multimedia broadcasting reception command. According to the control, the channel selector 302 selects a channel to be received from the digital multimedia broadcasting received through the antenna.

Then, the digital multimedia broadcasting processor 303 converts the digital multimedia broadcasting signal received through the channel selected by the channel selector 302 into a digital signal and corrects an error. The video broadcast signal is output to the video broadcast signal processor 304 among the broadcast signals converted into the digital signal by the digital multimedia broadcast processor 303, and the audio broadcast signal is output to the voice codec 307.

The digital video broadcast signal input to the video broadcast signal processor 304 is decoded by the MPEG method, and the decoded digital audio signal is output to the voice codec 307.

The voice codec 307 converts the voice broadcast signal converted into a digital signal by the digital multimedia broadcasting processor 303 and the digital voice signal decoded by the video broadcast signal processor 304 into an analog signal.

The digital video broadcasting signal processed by the video broadcasting signal processing unit 304 is displayed on the screen display unit 309, and the audio broadcasting signal and the audio signal converted into an analog signal by the audio codec 307 are output to the audio output unit 308. Is output via

4 is a flowchart illustrating a digital multimedia broadcasting reception method in a wireless communication terminal according to the present invention.

First, when the operation / control unit 305 receives the digital multimedia broadcasting reception request signal through the key input unit 310 (401), it starts to control each component according to the received digital multimedia broadcasting reception request signal. According to the control, the channel selector 302 selects a channel of the digital multimedia broadcasting received from the antenna (402).

Then, the digital multimedia broadcasting processing unit 303 decodes the digital multimedia broadcasting received through the channel selected by the channel selecting unit 302 and converts the digital multimedia broadcasting into a digital signal (403), and the image broadcasting signal processing unit 304 performs the digital multimedia. The digital signal received from the broadcast signal processor 303 is received and decoded in an MPEG manner (404).

In operation 405, the audio signal decoded by the video broadcast signal processor 304 is converted into an analog signal using the audio codec 307.

Then, the video broadcast signal decoded by the video broadcast signal processor 304 is displayed on the screen display unit 309, and the analog audio signal converted by the audio codec 307 is output through the audio output unit 308 ( 406).

In addition, the voice broadcast signal is processed as described above in the device description.

Meanwhile, the wireless communication terminal having the digital multimedia broadcasting reception function as described above continuously monitors the wireless communication signal transmitted from the base station and continues the wireless communication function.

That is, even when the digital multimedia broadcasting reception function is performed, when an incoming signal or a short message (SMS) received signal is received from the base station, the user enters a selection mode to select whether to receive a call or a short message. After continuing the reception function or performing an operation corresponding to the incoming signal or the short message reception signal from the base station, the digital multimedia broadcasting reception function is continued.

The present invention described above is not limited to the above-described embodiments and the accompanying drawings, and various substitutions, modifications, and changes are possible in the art without departing from the technical spirit of the present invention. It will be clear to those of ordinary knowledge.

As described above, the present invention enables a user to receive and watch a digital multimedia broadcast using a wireless communication terminal even if the terminal is not a digital multimedia broadcasting reception-only terminal, and the expensive service fee required for using an on-demand video service in a conventional wireless communication terminal. This can reduce the call charge.

1 is a block diagram of an embodiment of a conventional digital multimedia broadcasting receiving terminal.

2 is a block diagram of an exemplary embodiment of a wireless communication terminal providing a video on demand service according to the related art.

3 is a diagram illustrating an embodiment of a wireless communication terminal having a digital multimedia broadcasting reception function according to the present invention.

4 is a flowchart illustrating a digital multimedia broadcasting reception method in a wireless communication terminal according to the present invention.

* Explanation of symbols for the main parts of the drawings

301: wireless transceiver 302: channel selector

303: Digital multimedia broadcasting processing unit (OFDM / FEC / Data Codec)

304: video broadcast signal processing unit 305: operation / control unit

306: storage unit 307: audio codec

308: Audio output unit (speaker) 309: Screen display unit (LCD)

310: key input unit

Claims (4)

A wireless communication terminal having a digital multimedia broadcasting reception function, Input means for receiving a digital multimedia broadcasting reception command; Channel selecting means for selecting a channel of a digital multimedia broadcasting received through an antenna; Digital multimedia broadcasting processing means for receiving an analog broadcasting signal of a channel selected by the channel selecting means, converting the digital broadcasting signal into a digital signal, and correcting an error; Video broadcast signal processing means for decoding the video broadcast signal converted into a digital signal by the digital multimedia broadcasting processing means by an MPEG method; Voice coding / decoding means for converting the voice broadcast signal converted into a digital signal from the digital multimedia broadcasting processing means and the digital voice signal decoded from the video broadcasting signal processing means into an analog signal; Speech output means for outputting an analog speech signal converted by the speech coding / decoding means; Screen display means for displaying a video signal decoded into an MPEG signal by the video broadcast signal processing means; And Computing / control means for receiving the digital multimedia broadcasting by controlling each component according to the digital multimedia broadcasting reception command input through the input means while performing a wireless communication function. Wireless communication terminal having a digital multimedia broadcasting receiving function comprising a. The method of claim 1, The calculation / control means, And controlling the digital multimedia broadcasting processing means to output to the video signal processing means if the received digital multimedia broadcasting is video broadcasting, and to output the audio coding / decoding means to the audio broadcasting. Having a wireless communication terminal. The method according to claim 1 or 2, The calculation / control means, Even when the digital multimedia broadcasting reception function is performed, when an incoming signal or a short message (SMS) signal is received from the base station, the user enters a selection mode to select whether to receive a call or a short message. And performing digital multimedia broadcasting reception function again after continuing to perform an operation corresponding to an incoming signal or a short message reception signal from a base station. In the digital multimedia broadcasting receiving method in a wireless communication terminal, A first step of starting a digital multimedia broadcasting reception control function according to a digital multimedia broadcasting reception request signal received through a key input unit; Controlling a channel selector to select a channel of a digital multimedia broadcasting received through an antenna; A third step of the digital multimedia broadcasting processing unit decoding the digital multimedia broadcasting selected by the channel selecting unit and converting the digital multimedia broadcasting into a digital signal; A fourth step of the video broadcasting signal processing unit decoding the digital signal converted by the digital multimedia broadcasting processing unit in an MPEG method; A fifth step of converting the audio signal decoded by the video broadcasting signal processor into an analog signal using a voice codec; And A sixth step of outputting the video broadcast signal decoded by the video broadcast signal processor and the analog audio signal converted by the audio codec; Digital multimedia broadcasting receiving method in a wireless communication terminal comprising a.