KR20070007999A - Broadcasting service method and apparatus using computer in mobile communication station - Google Patents

Abstract

A method and a device for offering a broadcasting service to a computer through a mobile terminal are provided to transmit an MPEG(Moving Picture Experts Group)-TS(Transport Stream) generated for processing broadcasting data in the mobile terminal capable of using a DMB(Digital Multimedia Broadcasting) service to the computer. A system multiplication decoder(220) receives an MPEG-TS signal from the mobile terminal and divides the MPEG-TS signal into an A/V(Audio/Video) data signal. A receiving buffer(230) corrects a decoding time by temporarily storing an MPEG signal. An information source decoder(250) decodes an information source of the divided video signal and outputs decoded video to a monitor. A video signal multiplication decoder(240) decodes the divided video data signal with a hierarchical structure and a variable field. The information source decoder includes a reverse quantizer reversely quantizing the video signal, a reverse converter reversely converting the reversely quantized image, and a motion correction predictor bidirectionally predicting motion correction of the reversely converted image.

Description

Broadcasting service method and device through computer in mobile communication terminal {BROADCASTING SERVICE METHOD AND APPARATUS USING COMPUTER IN MOBILE COMMUNICATION STATION}

1 is a block diagram showing a connection between a mobile communication terminal and a computer according to an embodiment of the present invention;

2 is a block diagram illustrating a structure for transmitting a video compressed signal from a mobile communication terminal to a computer according to an embodiment of the present invention;

3 is a block diagram illustrating a coder and a decoder of a computer according to an embodiment of the present invention;

4 is a block diagram showing a specific structure of an information source decoder of the decoder in a mobile communication terminal according to an embodiment of the present invention;

5 is a flowchart illustrating an operation for decoding an in-phase compressed signal received at a mobile communication terminal according to an embodiment of the present invention.

*** Explanation of symbols for main parts of drawing ***

100: mobile communication terminal 110: wireless processing unit

120: digital signal processing unit

200: Computer 210: Storage Media

220: system multiplex decoder 230: receiving buffer

240: video signal multiplex decoder 250: information source decoder

260: code part

The present invention relates to a broadcast service method and apparatus in a mobile communication terminal, and more particularly, to a broadcast service method and apparatus for reproducing and viewing broadcast data received by a mobile communication terminal through a computer.

Digital Multimedia Broadcasting (hereinafter referred to as DMB) is based on Digital Audio Broadcasting (DAB), a technology for digital radio, and the concept of multimedia broadcasting has been added to video, weather, news, location, etc. Service that can send additional data information.

In recent years, a lot of mobile communication terminals for the multimedia broadcasting has been released, and interests of users are increasing. Such multimedia broadcasting requires a large amount of information such as voice, data, and video, and if it is transmitted and received without any processing, a considerable time delay occurs, and the broadcasting is disconnected from the broadcasting service requiring real time, or the broadcasting itself is impossible. do.

Therefore, in the multimedia broadcasting service, a technology for compressing and transmitting information is required to provide a smooth service, and various information compression technologies have been developed.

In general, the information compression technology for multimedia broadcasting service is using the Moving Picture Experts Group (MPEG), which is an international standard for media integration video compression. Unlike JPEG, which devised a method of compressing a still image, MPEG is used to transmit information through video compression and code expression that continuously change over time. Image compression chips developed in accordance with the standards for such image compression technology include MPEG1, MPEG2, MPEG3, MPEG4.

The mobile communication terminal receives and decodes the compressed broadcast information through the video compression technology to watch the desired broadcast.

However, since the display device is small due to the characteristics of the mobile communication terminal, users want to be able to vividly view the broadcasting service received by the mobile communication terminal on a larger screen. Accordingly, a mobile communication terminal (DMB phone) capable of broadcasting service may add a TV Out function to watch a broadcast through a television screen in the form of an analog signal.

Similarly, users want to output the broadcast service received from the mobile communication terminal in the computer. The DMB broadcast signal is transmitted and received as an MPEG-TS signal through the above-described information compression technique. However, MPEG-TS signals are not sent to the computer. There is a need for a technology for watching DMB broadcasting by restoring the MPEG-TS signal through a computer.

Accordingly, an object of the present invention is to provide a method and apparatus for transmitting an information compression signal (MPEG-TS) generated in a process of processing broadcast data in a mobile communication terminal capable of digital multimedia broadcasting service to a computer.

A method according to an embodiment of the present invention for achieving the above object, in the method for receiving a digital multimedia broadcast received by the mobile communication terminal through a computer, a video compressed video (MPEG-TS) signal from the mobile communication terminal Receiving a video signal; separating the received video compressed video signal into a video and audio data signal; correcting a time for decoding the video signal; decoding the separated video signals; And reproducing the decoded image through a monitor.

In addition, an apparatus according to an embodiment of the present invention for achieving the above object is a device for receiving a digital multimedia broadcasting received by the mobile communication terminal through a computer, the video compressed video (MPEG-TS) from the mobile communication terminal A system multiplexing decoder for receiving a signal and separating the received video compressed video signal into a video and audio data signal, a reception buffer for temporarily storing the video signal and correcting a time for decoding processing, and And an information source decoder for decoding the information source and outputting the decoded image to the monitor.

Hereinafter, with reference to the accompanying drawings, preferred embodiments of the present invention will be described in detail. It should be noted that in the following description, only parts necessary for understanding the operation and operation according to the present invention will be described, and descriptions of other parts will be omitted so as not to distract from the gist of the present invention.

In the embodiment of the present invention, a mobile communication terminal capable of digital multimedia broadcasting (hereinafter referred to as DMB) service will be described as an example. Here, the mobile communication terminal transmits an AMPE signal, which is a video compression signal, which can be divided into MPEG1, MPEG2, MPEG3, and MPEG4 according to an image compression chip. It should be noted that the embodiments of the present invention are described without distinguishing these signals. In the MPEG system, two types of multiplexing schemes are mainly used. One is a program stream (PS), in which a single program is multiplexed in an error-free channel environment. The other is a transport stream (TS) which multiplexes a plurality of programs in an error channel environment. It multiplexes a plurality of programs into one bit stream, which makes it suitable for digital TV broadcasting in the multimedia era, and adds a scramble function (a function of encrypting the bit stream so that only a paying subscriber can watch it). Directory information, individual bit string information, and the like can be loaded to facilitate random access. In such schemes, an embodiment of the present invention will be described with an example of an MPEG-TS signal encoded using a transport stream (TS) scheme.

First, a connection between a mobile communication terminal providing a DMB service and a computer according to an embodiment of the present invention, a structure of a mobile communication terminal transmitting the MPEG-TS signal, and a structure of a computer receiving the MPEG-TS signal are attached. It will be described with reference to the drawings.

1 is a block diagram illustrating a connection between a mobile communication terminal and a computer according to an embodiment of the present invention, and FIG. 2 illustrates a structure for transmitting a video compressed signal from a mobile communication terminal to a computer according to an embodiment of the present invention. It is a block diagram.

1 and 2, the mobile communication terminal 100 is connected to the computer 200 by connecting a cable through a connection terminal (Receptacle), the DMB broadcast signal provided from a broadcast server (not shown) And a digital signal processor 120 for converting the radio-processed DMB broadcast signal into a digital signal and transmitting the MPEG-TS signal to the computer.

The digital signal processor 120 includes a multiplexer 121 for receiving the DMB broadcast signal and performing MPEG-TS multiplexing, a video processor 122 for separating and processing the DMB broadcast signal into a video signal and an audio signal, respectively; Audi and a processing unit 123.

The computer 200 receives and demultiplexes an MPEG-TS signal from the mobile communication terminal 100, restores the compressed signal, and displays the compressed signal on a monitor, thereby allowing users to watch DMB broadcasts through the monitor.

Next, a structure for processing the MPEG-TS signal in the computer 200 will be described with reference to the accompanying drawings.

3 is a block diagram illustrating a coder and a decoder of a computer according to an embodiment of the present invention.

A portion of the computer 200 that processes an image may be divided into a coder, a decoder, and a storage media.

Referring to FIG. 3, the encoder 260 of the computer 200 includes an information source encoder, a video signal multiplex encoder, a transmission buffer, and a system multiplex encoder to compress and transmit an input image. The information source coder compresses the amount of information through DCT, quantization and negative compensation compensation bidirectional prediction, and the video multiplexing coder generates a data format after compression through hierarchical coding and variable length coding (VLC). The transmission buffer makes the amount of transmission data constant, and the system multiplexing encoder performs synchronization of video / audio data. Since the encoder 260 receives the MPEG-TS signal that is already compressed in the mobile communication terminal 100, it may not work in the embodiment of the present invention. However, it should be noted that the coder 260 has been described to understand compression of a general video. do.

The storage medium 210 stores the MPEG-TS signal received from the mobile communication terminal 100 and transmits the MPEG-TS signal to the decoder.

The decoder decodes the MPEG-TS signal received from the mobile communication terminal 100, the system multiplex decoder 220, the reception buffer 230, the video signal multiplex decoder 240, the information source decoder 250 It includes.

The system multiplexing decoder 220 separates video and audio data from the received MPEG-TS signal, and the reception buffer 230 temporarily stores the received received data to correct the decoding processing time for the received data.

The video signal multiplexing decoder 240 performs segmentation of compressed data through hierarchical decoding and variable length decoding (VLD), and the information source decoder 250 performs inverse quantization and inverse transform (IDCT) and Images are output after bidirectional prediction with motion compensation. Here, the information source decoder 250 will be described in more detail as follows.

4 is a block diagram illustrating a detailed structure of an information source decoder of the decoder in a mobile communication terminal according to an embodiment of the present invention.

Referring to FIG. 4, the inverse quantizer 251 of the information source decoder 250 receives and dequantizes an MPEG-TS signal from the mobile communication terminal 100. The received MPEG-TS signal is a quantized video signal by dividing a pixel value or a component value of each orthogonally transformed frequency by a quantization step size value (denominator) and removing the rest by rounding. Therefore, inverse quantizer 251 restores the original state by multiplying the quantization step size to reproduce the missing portion.

The inverse transformer 252 receives the inverse quantized image and, for example, if the original image is divided into 8 × 8 square pixel blocks, the inverse transformer 252 performs inverse transform for each 8 × 8 square pixel block.

The motion compensation predictor 253 bi-directionally predicts the motion of the inversely transformed image and outputs the image to the monitor.

Such decoding of the MPEG-TS signal can be decoded using a moving image tool or the like on a computer.

Next, an operation for decoding the MPEG-TS signal received from the mobile communication terminal in the decoding unit of the computer as described above will be described with reference to the accompanying drawings.

5 is a flowchart illustrating an operation for decoding an in-phase compressed signal received from a mobile communication terminal according to an embodiment of the present invention.

Referring to FIG. 5, when the decoder receives an MPEG-TS signal from the mobile communication terminal through the system multiplex decoder 220 in step 300, the decoder separates the video / audio data signal in step 310.

Then, in step 320, the decoder is separated into a video / audio signal through the reception buffer 230 to correct a time for decoding processing of received data, that is, a reception time, and then hierarchically through the video signal multiplex decoder 240. Decoding and variable length decoding are performed.

In step 330, the decoder performs inverse quantization by multiplying each coefficient by a quantization step for each forward pixel block of the decoded signal, that is, the received image, by the information source decoder 250. Do this. In operation 350, the decoder receives the inverse transformed image through the information source decoder 250 to perform bidirectional prediction for motion compensation, and outputs the image to be reproduced in step 360 to the monitor.

Meanwhile, in the detailed description of the present invention, specific embodiments have been described, but various modifications are possible without departing from the scope of the present invention. Therefore, the scope of the present invention should not be limited to the described embodiments, but should be defined not only by the scope of the following claims, but also by the equivalents of the claims.

As described above, the present invention has an effect that a computer can view an MPEG-TS signal transmitted from a mobile communication terminal having a digital multimedia broadcasting function by using a codec for decoding an MPEG-TS signal in a computer.

Claims (5)

In the method for receiving a digital multimedia broadcasting received by the mobile communication terminal through a computer, Receiving a compressed video (MPEG-TS) signal from the mobile communication terminal; Dividing the received video compressed video signal into a video and audio data signal; Correcting time for decoding the separated image signals; Decoding the separated video signals; And a process of playing the decoded video through a monitor. The method of claim 1, wherein the decoding of the separated image signals comprises: Inversely quantizing the video signal; Inversely transforming the inverse quantized image; And performing bidirectional prediction for motion compensation of the inversely transformed image. An apparatus for receiving a digital multimedia broadcasting received by a mobile communication terminal through a computer, A system multiplexing decoder for receiving a compressed video (MPEG-TS) signal from the mobile communication terminal and separating the received video signal into a video and audio data signal; A receiving buffer which temporarily stores the moving image compressed video signal and corrects a time for decoding processing; And an information source decoder for decoding the information source of the separated video signal and outputting the decoded image to a monitor. The method of claim 3, And a video signal multiplexing decoder for hierarchically and variably decoding the separated video data signal. The method of claim 3, wherein the information source decoder, An inverse quantizer for inversely quantizing the video signal; An inverse transformer for inversely transforming the inverse quantized image; And a motion compensation predictor for performing bidirectional prediction for motion compensation of the inversely transformed image.

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