KR20080005025A - Apparatus for digital multimedia broadcasting receiver and method of processing signal - Google Patents

Abstract

An apparatus for receiving DMB(Digital Multimedia Broadcasting) and a method for processing DMB signal are provided to allow a subscriber to watch DMB through an exiting multimedia terminal of the user. An RF module(110) locks a broadcasting signal of a channel selected by a user, among broadcasting signals received through an antenna. A base band and decoding unit(120) converts the locked broadcasting signal into digital type broadcasting data, and decodes the broadcasting data according to H.264 codec. An encoding unit(130) encodes the decoded broadcasting data in an MJPEG(Motion Joint Photographic Experts Group) format. An USB(Universal Serial Bus) controller(140) is connected to a multimedia terminal(200) by a USB interface, wherein the USB controller transmits the encoded broadcasting data to the multimedia terminal.

Description

Apparatus for digital multimedia broadcasting receiver and method of processing signal

1 is a block diagram for explaining a DMB receiving apparatus using a USB interface according to an embodiment of the present invention.

2 is a block diagram illustrating a multimedia terminal according to the present invention;

3 is a diagram illustrating an example of implementing a DMB receiving apparatus according to a preferred embodiment of the present invention.

4 is a block diagram illustrating an encoding processing method of an MJPEG encoding unit according to a preferred embodiment of the present invention.

5 is a block diagram illustrating a USB control unit in a preferred embodiment of the present invention.

6 is a block diagram illustrating a camera module according to the present invention;

7 is a flowchart illustrating a broadcast signal processing method of a DMB receiving apparatus according to an embodiment of the present invention.

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

100: DMB receiver 110: RF module

120: baseband / decoding unit 130: MJPEG encoding unit

131: video input module 132: video engine module

133: voice codec module 134: memory interface module

135: data processing module 136: MCU

137: USB interface module 138: port portion

140: USB control unit 141: SPI / HPI interface

142: UART interface 143: control interface

144: PLL interface 145: CPU

146: USB OTG 147: GPIO Interface

148: internal cache memory 150: video / audio providing unit

151: Camera Module 151-1: Image Sensor Array

151-2: analog signal processor 151-3: analog-digital converter

151-4: Digital Signal Processor 151-5: Image Step Processor

151-6: Image data processor 152: Microphone

200: multimedia terminal 210: USB connection

220: network connection unit 230: central processing unit

240: keypad portion 250: audio output unit

260: display unit

The present invention relates to a digital multimedia broadcasting receiver and a broadcast signal processing method thereof.

With the development of current broadcasting technology, digital multimedia broadcasting (DMB) service has been started.

DMB is a broadcasting service that digitally modulates various multimedia signals such as voice and video and transmits them to a fixed DMB terminal or a portable DMB terminal and a vehicle receiver.

The DMB is based on DAB (Digital Audio Broadcasting), a technology for digital radio, and the multimedia broadcasting concept has been added to the DAB technology to transmit data information such as video, weather, and news to the subscriber. On the other hand, high quality / high definition broadcasting services can be enjoyed through a portable DMB terminal or a vehicle receiver.

DMB can be largely classified into terrestrial DMB and satellite DMB, and satellite DMB uses satellites.

Satellite DMB transmits a program to a satellite body in a broadcasting center for satellite DMB, and the satellite body spreads the program to DMB terminals nationwide through radio waves.

The terrestrial DMB transmits a program to the DMB terminal using a frequency on the ground. Therefore, it uses VHF channel 12 which is empty and 8 channel for military use. Unlike satellite DMB, broadcast signal is transmitted through base station on the ground.

The subscriber can watch the DMB while moving by using a terminal such as a mobile phone or a PDA with a built-in DMB receiving module or connect an external DMB receiving module to the terminal.

However, a situation in which a DMB can be viewed using a multimedia terminal capable of outputting multimedia information, such as a portable multimedia player (PMP), a PlayStation Portable (PSP), and a digital camera, which is currently widely used, has not been proposed.

Therefore, the present invention was devised to solve the above problems, and the subscriber can watch the DMB by using the multimedia terminal and the DMB receiving device that are widely used, as well as the video communication using the DMB receiving device. It is an object of the present invention to provide a digital multimedia broadcasting receiving apparatus that can use an additional service and a method of processing the broadcasting signal.

The present invention also provides a digital multimedia broadcasting receiver and a broadcast signal processing method for connecting an existing multimedia terminal and a DMB receiving apparatus through a USB interface and allowing a subscriber to tune a broadcast channel using the multimedia terminal. There is that purpose.

DMB receiving apparatus using a USB interface according to an aspect of the present invention for achieving the above object, the RF module for locking the broadcast signal of the channel selected by the subscriber of the broadcast signal received through the antenna, and locked in the RF module Converts the analog broadcast signal into digital broadcast data and encodes the broadcast data decoded according to the H.264 codec and the broadcast data decoded by the baseband / decoded according to the MJPEG method. And an USB controller for transmitting the encoded broadcast data to a multimedia terminal connected through a USB interface.

The encoding unit according to the present invention is connected to the baseband / decoding unit and the CCIR656 interface, an image input module for receiving image data among broadcast data, an image engine module for encoding image data input to the image input module in an MJPEG method; , The voice codec module which is connected to the baseband / decoding unit and the I2S interface and receives the audio data from the broadcast data and encodes it in the MJPEG method, and merges the video data encoded by the video engine module and the audio data encoded by the audio codec module. And a data processing module for transmitting to the multimedia terminal through the USB control unit.

The encoder according to the present invention includes an MCU controlling the encoding of the image engine module and the voice codec module, a USB interface module for transmitting data merged by the data processing module through the USB interface, and the USB controller and the baseband / And a port unit including a GPIO module for connecting to the decoding unit, a UART I2C port for connecting to an external control unit, and a host interface module for internal communication.

The USB control unit according to the present invention is connected to an SPI / HPI interface for receiving broadcast data encoded in the MJPEG method and selecting a master or slave function of the USB communication method, an external control means, and a control received from an external control means. When the UART (universal asynchronous receiver / transmitter) interface that controls the USB control unit according to the signal and the SPI / HPI select the master function, transmit the encoded broadcast data to the multimedia terminal through the USB interface, when the slave function, USB OTG for transmitting channel information received from the multimedia terminal to the RF module.

According to another aspect of the present invention, a DMB receiving apparatus using a USB interface includes a camera module for capturing an image of a subscriber and providing image data, and a microphone for recording the subscriber's voice and providing audio data. The RF module locks the broadcast signal of a channel selected by the subscriber among the broadcast signals received through the antenna, and converts the analog broadcast signal locked by the RF module into digital broadcast data and converts the broadcast data into H. Baseband / decoding unit for decoding according to .264 codec and broadcasting data decoded in baseband / decoding unit according to MJPEG method or video / audio data provided from video / audio provider according to MJPEG method The encoding unit, and the encoded broadcast data or the subscriber's video / audio data to the USB interface. Which includes a USB control unit for transmission to the multimedia terminal.

The encoding unit according to the present invention is connected to the baseband / decoding unit and the image / audio providing unit through a CCIR656 interface, and includes an image input module for receiving image data or subscriber image data among broadcast data, and an image input through the image input module. A video engine module that encodes data using the MJPEG method, a baseband / decoding unit, a video / audio providing unit, and an I2S interface, and receives an audio data or a subscriber's voice data from the broadcast data and encodes it using the MJPEG method. And a data processing module for merging the video data encoded in the video engine module and the audio data encoded in the audio codec module and transmitting the same to the multimedia terminal through the USB controller.

The camera module according to the present invention is implemented with a plurality of RGB micro lenses, and provides an image sensor array for providing a subscriber's image signal, and gain correction, control of gain, or balance of the image signal provided from the image sensor array. An analog signal processor for controlling a signal, an analog-digital converter for converting an image signal processed by an analog signal processor into digital image data, and a digital signal for controlling an image corresponding to the image data converted by the analog-digital converter. An image step processor for controlling an image size corresponding to the image data processed by the digital signal processor, and an image data output unit for transmitting the image data corresponding to the image processed by the image step processor to the encoder through the CCIR656 interface. Include.

The control of the image according to the present invention is to control the quality of the image corresponding to the image data, to improve the edge (Edge), to control the color space (Color space), Control saturation, control gamma (sensitivity), or control color cross talk.

According to another aspect of the present invention, a multimedia terminal includes a USB connection unit connected to a USB control unit and a USB interface to receive data or transmitting channel information selected by a subscriber to a DMB terminal, and a network connection unit connecting to the Internet through a wireless network. And a keypad unit for selecting a channel from the subscriber and a video / audio data received from the DMB receiving device according to the MJPEG method to output video and audio, and receiving channel information selected via the keypad unit through the USB connection unit. It includes a central processing unit for transmitting to the device.

When the subscriber requests video communication, the central processing unit according to the present invention starts communication with the counterpart terminal through the network connection unit, and transmits the subscriber's voice / video data received from the DMB receiving apparatus.

According to another aspect of the present invention, there is provided a method for processing a broadcast signal of a DMB receiving apparatus, the method including locking a broadcast signal corresponding to a specific frequency of a channel selected by a subscriber among broadcast signals received through an antenna, Converting the broadcast signal into broadcast data in digital form, decoding the converted broadcast data according to the H.264 codec, encoding the decoded broadcast data according to the MJPEG method, and encoding the encoded broadcast data via USB. And transmitting to a multimedia terminal connected to an interface.

The encoding according to the present invention includes separating video data and audio data from among broadcast data and encoding the video data and audio data according to an MJPEG method, and merging the encoded video data and audio data.

In accordance with an aspect of the present invention, there is provided a method for processing a broadcast signal of a DMB receiving apparatus, including: generating, by a DMB receiving apparatus, video / audio data of a subscriber, encoding the video / audio data in an MJPEG method and transmitting the same to a multimedia terminal; When the video communication request is requested, the multimedia terminal initiates communication with the counterpart terminal via the network, and the multimedia terminal transmits the video / audio data of the subscriber received from the DMB receiving apparatus to the counterpart terminal to provide the video communication service. It further includes.

DMB receiving apparatus using a USB interface according to the present invention and a broadcast signal processing method thereof will be described in detail with reference to the accompanying drawings.

1 is a block diagram illustrating a DMB receiving apparatus using a USB interface according to a preferred embodiment of the present invention.

Referring to FIG. 1, in the DMB receiving apparatus 100 according to the present invention, the multimedia terminal 200 is connected with a USB interface (USB cable), and the DMB receiving apparatus 100 is an RF module connected with the antenna 10 ( 110, a baseband / decoding unit 120, an MJPEG encoding unit 130, a USB control unit 140, and a video / audio providing unit 150.

The multimedia terminal 200 according to the present invention refers to a terminal equipped with an application capable of outputting video / audio data, such as a portable multimedia player (PMP), a PlayStation Portable (PSP), a digital camera, or the like.

The antenna 10 receives a DMB broadcast signal (hereinafter referred to as a "broadcast signal") that propagates through the air.

The RF module 110 locks a broadcast signal corresponding to a frequency of a channel selected by a subscriber among broadcast signals received through the antenna 10.

The baseband / decoding unit 120 includes a baseband 121 for processing a broadcast signal in the analog form locked by the RF module 110 and a codec 122 for decoding broadcast data.

That is, the baseband / decoding unit 120 converts the analog broadcast signal locked by the RF module 110 into digital broadcast data (A / D conversion) and ensemble according to the digital audio broadcasting (DAB) standard. Extract data, that is, broadcast data.

The baseband / decoding unit 120 processes error coding, Viterbi decoding, etc., on the extracted broadcast data.

In addition, the baseband / decoder 120 decodes the broadcast data since the extracted broadcast data including the image / audio / data is encoded.

At this time, the codec 122 of the baseband / decoding unit 120 decodes the broadcast data according to the “H.264 codec” because the DMB broadcast data is encoded according to the “H.264 codec”.

The MJPEG encoding unit 130 encodes the broadcast data decoded by the baseband / decoding unit 120 according to the 'H.264 codec' so that the multimedia terminal 200 connected through the USB interface can be output.

For example, the MJPEG encoding unit 130 may encode video and audio data according to a Motion JPEG (MJPEG) method, and transmit the encoded MJPEG broadcast data to the multimedia terminal 200.

The MJPEG encoding unit 130 may encode data according to a codec used by the multimedia terminal 200, and may encode data according to an MJPEG method or an MPEG4 method.

The video / audio providing unit 150 captures the image of the subscriber and provides the image data, or records the audio to provide the audio data, so that the subscriber may be provided with a function such as video communication using the multimedia terminal 200. Make sure

The MJPEG encoding unit 130 encodes the video / audio data of the subscriber provided from the video / audio providing unit 150 in the MJPEG method.

In this case, the MJPEG encoding unit 130 may make a different codec for encoding broadcast data according to the video / audio codec used by the multimedia terminal 200. That is, the MJPEG encoding unit 130 may encode the video / audio data using the same codec as the video / audio codec used by the multimedia terminal 200.

The USB control unit 140 is connected to the multimedia terminal 200 through a USB interface, and the multimedia terminal receives broadcast data encoded by the MJPEG encoding unit 130 or video / audio data of a subscriber provided from the video / audio providing unit 150. Send to 200.

In addition, the USB controller 140 supports both master / slave functions, and performs a master function when transmitting broadcast data or video / audio data of a subscriber to the multimedia terminal 200, and the subscriber receives the multimedia terminal 200. In the case of tuning the channel using), the channel is selected by the slave function.

When the channel is selected from the multimedia terminal 200, the USB controller 140 transmits corresponding channel information to the RF module 110 so that the RF module 110 locks a specific frequency of the corresponding channel to select a channel to which the subscriber selects. Make it available for viewing.

2 is a block diagram illustrating a multimedia terminal according to the present invention.

Referring to FIG. 2, the multimedia terminal 200 according to the present invention includes a USB connection unit 210, a central processing unit 230, a network connection unit 220, a keypad unit 240, a voice output unit 250, and a display unit ( 260).

The USB connection unit 210 is connected to the DMB receiving apparatus 100 through a USB interface and receives the MJPEG encoded broadcast data and the subscriber's video / audio data from the DMB receiving apparatus 100.

The network connection unit 220 connects to a wireless network (mobile communication network or wireless Internet, etc.).

The voice output unit 250 outputs a voice according to broadcast data, a voice of a subscriber, and a voice according to voice data received through the network connection unit 220.

The display unit 260 may be implemented with a plurality of display elements (eg, LCDs), and outputs an image according to broadcast data, an image of a subscriber, and an image according to image data received through the network connection unit 220. .

The keypad unit 240 includes a plurality of keys, and allows a subscriber to select a channel, access the Internet through a wireless network, or communicate with another terminal.

When the broadcast data is received through the USB connection unit 210, the central processing unit 230 outputs the image of the broadcast data to the display unit 260 after decoding the MJPEG method, and outputs the audio to the audio output unit 250. do.

When the subscriber selects a channel through the keypad unit 240, the central processing unit 230 transmits channel information selected by the subscriber to the DMB receiving apparatus 100 through the USB connection unit 210.

In addition, when the subscriber requests video communication after the subscriber connects to the Internet through the wireless network, the central processing unit 230 outputs the voice received from the opposite terminal to the voice output unit 250 and displays the image. While transmitting through the video data and audio data of the subscriber received via the USB connection unit 210 is transmitted to the counterpart terminal.

That is, the central processing unit 230 provides a video communication function using the subscriber's video / audio data received from the DMB receiving apparatus 100.

3 is a diagram illustrating an example of implementing a DMB receiving apparatus according to a preferred embodiment of the present invention.

As shown in FIG. 3, the baseband / decoding unit 120 may be implemented in a one-chip form, and a baseband function of modulating a carrier in DMB broadcast data, a function of decoding broadcast data, and the like are mounted on one chip. Can be implemented.

The baseband / decoding unit 120 provides a synchronous clock to the RF module 110 and is connected to an inter-IC sound (I2S) interface.

The image data processed by the baseband / decoding unit 120 is transmitted to the MJPEG encoding unit 130 through the CCIR (Comite Consultatif International des Radiocommunications) 656 interface, and the audio data is transmitted to the MJPEG encoding unit 130 through the I2S interface. Is sent.

The baseband / decoder 120 is connected to an oscillator (OSC) 161 that provides a clock and a serial flash memory 162 that stores program information and channel tuning information of the baseband / decoder 120. do.

In addition, the MJPEG encoding unit 130 is connected to the flash memory 164 and the SDRAM 163 which are storage means for temporarily storing the encoded data or storing encoding information.

The video / audio providing unit 150 may be implemented as a camera module 151 for capturing an image of a subscriber and providing image data, and a microphone 152 for recording audio and providing audio data.

In addition, the camera module 151 is connected to the CCIR656 interface to provide image data to the MJPEG encoding unit 130, the microphone 152 is connected to the I2S interface to provide audio data, the microphone 152 and the MJPEG encoding unit Between the 130 is provided a converter 165 for digital-analog conversion of the voice data.

More specifically, each component will be described as follows.

The RF module 110 processes an RF signal received from the antenna 10, that is, a DMB broadcast signal, and locks a specific frequency of a channel selected by a subscriber among 21 channel information bands of terrestrial multimedia broadcasting (T-DMB). The broadcast signal is provided to the baseband / decoding unit 120.

The RF module 110 receives channel information selected by the subscriber through the multimedia terminal 200 and locks a specific frequency of the corresponding channel.

The baseband / decoder 120 converts the broadcast data in analog form received from the RF module 110 into the broadcast data in digital form.

The baseband / decoding unit 120 transmits channel information selected by the subscriber to the RF module 110 and processes error coding and Viterbi decoding after extracting the ensemble data from the converted broadcast data.

In addition, since the data band, video data, audio data, and information data included in the converted broadcast data are encoded according to the 'H.264 codec', the data band decodes the broadcast data according to the 'H.264 codec' so that the video data uses the CCIR656 interface. Through the MJPEG encoding unit 130, the voice data is transmitted to the MJPEG encoding unit 130 through the I2S interface.

The MJPEG encoding unit 130 encodes video data and audio data, which are broadcast data received from the baseband / decoding unit 120, into MJPEG data that the multimedia terminal 200 can output. That is, the MJPEG encoding unit 130 encodes the broadcast data according to the MJPEG method and transmits it to the USB control unit 140.

In addition, the MJPEG encoding unit 130 MJPEG the video data of the subscriber received from the video / audio providing unit 150 through the CCUR656 interface, and the audio data received from the video / audio providing unit 150 through the I2S interface. Encoding according to the scheme is transmitted to the USB control unit 140.

The USB control unit 140 has a USB 2.0 OTG (on the go) function that supports the master / slave mode, and the multimedia terminal 200 connected to the MJPEG encoded broadcast data and the subscriber's video / audio data through the USB interface. The channel information is transmitted from the multimedia terminal 200 and the channel information is transmitted to the RF module 110.

4 is a block diagram illustrating an encoding processing method of an MJPEG encoding unit according to an exemplary embodiment of the present invention.

Referring to FIG. 4, the MJPEG encoding unit 130 according to the present invention includes an image input module 131, a data processing module 135, an image engine module 132, a main control unit (MCU) 136, and an audio. A codec module 133, a USB interface module 137, a memory interface module 134, and a port unit 138 are provided.

The image input module 131 receives image data of broadcast data or image data of a subscriber through the CCIR656 interface.

That is, the image input module 131 matches the image data among the broadcast data output from the baseband / decoder 120 and the subscriber's image data provided from the camera module 151 to the CCIR656 interface, and the camera module 151 A zoom in or zoom out function is performed on the subscriber's video data received from the network.

The image engine module 132 processes a hardware (H / W) codec function for encoding data. That is, the image engine module 132 processes the hardware codec functions for the MJPEG encoder and the MPEG4 encoder, and the MJPEG codec performs at least 30 frames per second (fps) of QVGA (302X240) image data. has performance

The voice codec module 133 selectively receives voice data received from the baseband / decoder 120 and voice data input from the microphone 152 and encodes the data.

The memory interface module 134 matches the SDRAM 163 used by the image engine module 132 as a signal buffer when processing the MJPEG codec and the Audio codec, and the SDRAM 163 and the flash memory 164 which are external storage means. Match and buffer video and audio data without interruption.

The data processing module 135 merges the audio data processed by the voice codec module 133 and the image data processed by the image engine module 132 and transmits the broadcast data to the multimedia terminal 200 as broadcast data.

That is, the data processing module 135 merges the audio data processed by the voice codec module 133 and the image data processed by the image engine module 132 into one broadcast data.

The MCU 136 controls data processing of the image engine module 132 and the voice codec module 133, and controls the overall functions of the MJPEG encoding unit 130. In addition, the MCU 136 controls the flow of data and signals through a bus, which is a signal line connected between each module.

The USB interface module 137 transmits the broadcast data merged in the data processing module 135 to the multimedia terminal 200 through the USB interface, and transmits data at a high speed through the USB interface. Is needed.

The port unit 138 is a GPIO module which is a port for connecting the MJPEG encoding unit 130 to the USB control unit 140, the video / audio providing unit 150, or the baseband / decoding unit 120, and the MJPEG encoding unit ( 130 is provided with a UART I2C port, which is a port not connected to an external control unit, and a host interface module for performing internal communication.

Accordingly, the video data provided from the baseband / decoder 120 or the video data of the subscriber provided from the video / audio provider 150 are input to the video input module 131 and encoded by the video engine module 132. And transmitted to the data processing module 135.

Then, the voice data provided from the baseband / decoder 120 or the subscriber's voice data provided from the video / audio provider 150 is input to the voice codec module 133 and encoded, and the data processing module 135 Is sent to.

 The data processing module 135 merges the processed image data and audio data and transmits them to the multimedia terminal 200 through the USB interface module 137.

5 is a block diagram illustrating a USB control unit in a preferred embodiment of the present invention.

Referring to FIG. 5, the USB controller 140 according to the present invention may include an SPI / HPI interface 141, a universal asynchronous receiver / transmitter (UART) interface 142, a control interface 143, a PLL interface 144, and a CPU. 145, USB OTG 146, General Purpose I / O (GPIO) interface 147, and internal cache memory 148.

The SPI / HPI interface 141 receives data encoded by the MJPEG method from the MJPEG encoding unit 130. In addition, the SPI / HPI interface 141 may selectively select the SPI master / slave function, and transmit and receive data in a full duplex or half deplex data communication method.

The universal asynchronous receiver / transmitter (UART) interface 142 provides an interface with an external control means, and the control interface 143 receives control data from the external control means and inputs control data, for example, When the reset signal is input, the USB controller 140 is reset.

The PLL interface 144 receives the basic clock provided from the oscillator to generate the required clock through the internal PLL, and the CPU 145 controls the USB controller 140 for full functions, and a 16 bit reduced instruction set computer , reduced instruction set computing).

The USB OTG 146 is connected to the multimedia terminal 200 through a USB interface, supports USB 2.0 On-The-Go characteristics, session request protocol (SRP) and Host Negotiation Protocol (HNP), and General Purpose I (GPIO). Interface 147 handles the function of an input / output port for receiving control data from an external device or external control means.

The internal cache memory 148 performs an internal ROM and a RAM MEMORY function that allows the USB controller 140 to smoothly transmit data through the USB interface.

The camera module 151 according to the present invention may capture a subscriber's image as a still image and a video, and transmit the same to the MJPEG encoding unit 130. The camera module 151 may be implemented as a CMOS camera module.

The camera module has a video graphics adapter (VGA) or higher resolution, and converts the captured analog image signal into digital image data to be transmitted to the MJPEG encoding unit 130.

6 is a block diagram illustrating a camera module according to the present invention.

Referring to FIG. 6, the camera module 151 according to the present invention includes an image sensor array 151-1, an analog signal processor 151-2, an analog-digital converter 151-3, and a digital signal processor 151-. 4) an image step processor 151-5 and an image data output unit 151-6.

The image sensor array 151-1 may be implemented with an RGB micro lens, and provides an image signal by capturing an image of a subscriber or an image of the surroundings, and the resolution of the CMOS sensor is adapted to a situation of a product to be used. For example, 1.3M Pixel (1300x1028) can be used.

The analog signal processor 151-2 includes an automatic gain control (AGC) unit and an automatic white balance (AWB) unit, and corrects an image signal received from the image sensor array 151-1, controls the gain of the signal, or Control the balance of the input image.

The analog-to-digital converter 151-3 may be implemented as two 10-bit analog / digital (A / D) converters, and converts an image signal input from the analog signal processor 151-2 into digital image data. .

The digital signal processor 151-4 inserts the raw image data converted by the analog-digital converter 151-3 into the RGB pixel or controls the quality of the image.

In addition, the digital signal processor 151-4 may improve edge of an image, control color space, control hue and saturation, control gamma, and color cross talk. Image control such as control) is performed, and 10-bit image data is converted into 8-bit image data, or white pixel control is processed.

The image step processor 151-5 controls the image size to the required image size for the image data received from the digital signal processor 151-4.

The image data output unit 151-6 processes a port function of transmitting image data to the MJPEG encoding unit 130 through the CCIR656 interface.

7 is a flowchart illustrating a broadcast signal processing method of a DMB receiving apparatus according to an embodiment of the present invention.

Referring to FIG. 7, the antenna 10 of the DMB receiving apparatus 100 receives a broadcast signal propagated through the air, and the RF module 110 selects a subscriber from among broadcast signals received through the antenna 10. The broadcast signal corresponding to the frequency of the channel is locked (lacking) (S100).

The baseband / decoding unit 120 converts the analog broadcast signal locked by the RF module 110 into broadcast data in digital form (A / D conversion) (S 110).

The baseband / decoder 120 extracts ensemble data according to digital audio broadcasting (DAB) standard, that is, broadcast data, from the converted data, and processes error coding and viterbi decoding of the broadcast data.

In addition, the baseband / decoder 120 decodes the broadcast data since the extracted broadcast data including the video / audio is encoded (S120).

At this time, the baseband / decoder 120 decodes the broadcast data according to the 'H.264 codec' because the broadcast data is encoded according to the 'H.264 codec'.

The MJPEG encoding unit 130 encodes the broadcast data decoded by the baseband / decoding unit 120 according to the 'H.264 codec' so that the multimedia terminal 200 connected through the USB interface can be output.

For example, the MJPEG encoding unit 130 may encode video and audio data according to a Motion JPEG (MJPEG) method, and transmit the encoded MJPEG broadcast data to the multimedia terminal 200 (S 130).

The multimedia terminal 200 outputs a broadcast according to the broadcast data received through the USB interface (S 140).

When the subscriber selects a broadcast channel, the multimedia terminal 200 transmits channel information to the DMB receiving apparatus 100 (S150).

In this case, the multimedia terminal 200 performs a master function of the USB communication method, and the DMB receiving apparatus 100 performs a slave function.

The RF module 110 of the DMB receiving apparatus 100 locks a specific frequency corresponding to channel information received from the multimedia terminal 200 so that broadcast data of a channel selected by the subscriber is transmitted to the multimedia terminal 200. (S 160).

Meanwhile, when the subscriber selects the image communication, the multimedia terminal 200 connects to the Internet through the wireless network and starts communication with the counterpart terminal (S 170).

In addition, the DMB receiving apparatus 100 transmits the subscriber's image data and audio data to the multimedia terminal 200 through the USB interface (S 180).

At this time, the image / audio providing unit 150 of the DMB receiving apparatus 100 captures the image of the subscriber and provides the image data or records the voice to provide the audio data, so that the subscriber uses the multimedia terminal 200. To be provided with functions such as video communication.

The MJPEG encoding unit 130 encodes the video / audio data of the subscriber provided from the video / audio providing unit 150 in the MJPEG method.

The USB control unit 140 is connected to the multimedia terminal 200 through a USB interface, and the multimedia terminal receives broadcast data encoded by the MJPEG encoding unit 130 or video / audio data of a subscriber provided from the video / audio providing unit 150. Send to 200.

The multimedia terminal 200 outputs video and audio received from the counterpart terminal, transmits the video and audio data of the subscriber received from the DMB receiving apparatus 100 to the counterpart terminal through a wireless network, thereby providing a video communication service. Provided to (S 180).

Although the present invention has been described in detail only with respect to the described embodiments, it will be apparent to those skilled in the art that various modifications and changes are possible within the technical spirit of the present invention, and such modifications and modifications belong to the appended claims.

As described above, according to the present invention, the subscriber can watch the broadcast by connecting the existing multimedia terminal and the DMB receiving apparatus through the USB interface.

According to the present invention, an additional service such as video communication can be used while watching a broadcast by connecting a DMB receiving apparatus to a multimedia terminal.

In addition, according to the present invention, the subscriber can tune the broadcast channel by operating the multimedia terminal while watching the broadcast using the multimedia terminal.

Claims (13)

In the digital multimedia broadcasting receiver, An RF module for locking a broadcast signal of a channel selected by a subscriber among broadcast signals received through an antenna; A baseband / decoding unit for converting the analog broadcast signal locked by the RF module into digital broadcast data and decoding the broadcast data according to the H.264 codec; An encoding unit for encoding the broadcast data decoded by the baseband / decoding unit according to an MJPEG method; And a USB controller for transmitting the encoded broadcast data to a multimedia terminal connected through a USB interface. The method of claim 1, wherein the encoding unit, An image input module connected to the baseband / decoding unit through a CCIR656 interface and receiving image data among the broadcast data; An image engine module for encoding the image data inputted to the image input module by MJPEG; A voice codec module connected to the baseband / decoding unit through an I2S interface and receiving voice data among the broadcast data and encoding the MJPEG method; And a data processing module for merging the video data encoded in the video engine module and the audio data encoded in the audio codec module and transmitting the merged video data to the multimedia terminal through the USB controller. The method of claim 2, wherein the encoding unit, A MCU controlling the encoding of the video engine module and the audio codec module; A USB interface module for transmitting the data merged and processed by the data processing module through a USB interface; And a port unit including a GPIO module for connecting the encoding unit to the USB control unit and the baseband / decoding unit, a UART I2C port for connecting to an external control unit, and a host interface module for internal communication. Digital multimedia broadcasting receiver. The method of claim 1, wherein the USB control unit, An SPI / HPI interface for receiving the broadcast data encoded by the MJPEG method and selecting a master or slave function of a USB communication method; A UART (universal asynchronous receiver / transmitter) interface connected to an external control means and controlling the USB control unit according to a control signal received from the external control means; When the SPI / HPI selects a master function, the encoded broadcast data is transmitted to the multimedia terminal through a USB interface. When the SPI / HPI selects a slave function, the USB transmits channel information received from the multimedia terminal to the RF module. Digital multimedia broadcasting receiver including OTG. In the digital multimedia broadcasting receiver, An image / audio providing unit including a camera module for capturing the image of the subscriber and providing image data, a microphone for recording the subscriber's voice and providing audio data; An RF module for locking a broadcast signal of a channel selected by a subscriber among broadcast signals received through an antenna; A baseband / decoding unit for converting the analog broadcast signal locked by the RF module into digital broadcast data and decoding the broadcast data according to the H.264 codec; An encoding unit for encoding the broadcast data decoded by the baseband / decoding unit according to an MJPEG method or encoding the video / audio data provided from the video / audio providing unit according to the MJPEG method; And a USB controller for transmitting the encoded broadcast data or video / audio data of the subscriber to a multimedia terminal connected through a USB interface. The method of claim 5, wherein the encoding unit, An image input module connected to the baseband / decoding unit and the image / audio providing unit through a CCIR656 interface, and receiving image data or image data of the subscriber from the broadcast data; An image engine module for encoding the image data inputted to the image input module by MJPEG; A voice codec module connected to the baseband / decoding unit and the video / audio providing unit through an I2S interface and receiving voice data or voice data of the subscriber from the broadcast data and encoding the MJPEG method; And a data processing module for merging the video data encoded in the video engine module and the audio data encoded in the audio codec module and transmitting the merged video data to the multimedia terminal through the USB controller. The method of claim 5, wherein the camera module, An image sensor array implemented with a plurality of RGB micro lenses to provide an image signal of the subscriber; An analog signal processor configured to correct gain of an image signal provided from the image sensor array, control gain, or control an image balance; An analog-digital converter for converting the video signal processed by the signal processor from the analog into digital video data; A digital signal processor for controlling an image corresponding to the image data converted by the analog-digital converter; An image step processor configured to control an image size corresponding to the image data processed by the digital signal processor; And a video data output unit for transmitting the video data corresponding to the image processed by the image step processor to the encoding unit through a CCIR656 interface. The method of claim 7, wherein the control of the image, Control the quality of an image corresponding to the image data, improve edges, control color space, control hue and saturation, or gamma DMB receiving device using a USB interface that controls (sensitivity) or controls color cross talk. In a multimedia terminal, A USB connection unit connected to a digital multimedia broadcasting receiver through a USB interface to receive data or to transmit channel information selected by a subscriber to the DMB terminal; A network connection for accessing the Internet via a wireless network, A keypad unit for receiving the channel from the subscriber; Decode the video / audio data received from the digital multimedia broadcasting receiver according to the MJPEG method to output video and audio, and transmit channel information selected through the keypad to the digital multimedia broadcasting receiver through the USB connection unit. Multimedia terminal including a central processing unit. The method of claim 9, wherein the central processing unit, When the subscriber requests video communication, the terminal starts communication with the counterpart terminal through the network connection unit, and transmits the voice / video data of the subscriber received from the DMB receiving apparatus to the terminal. In the broadcast signal processing method of the digital multimedia broadcasting receiver, Locking a broadcast signal corresponding to a specific frequency of a channel selected by a subscriber among broadcast signals received through an antenna; Converting the locked broadcast signal in analog form into broadcast data in digital form; Decoding the converted broadcast data according to an H.264 codec; Encoding the decoded broadcast data according to an MJPEG scheme; And transmitting the encoded broadcast data to a multimedia terminal connected through a USB interface. The method of claim 11, wherein the encoding step, Classifying video data and audio data among the broadcast data and encoding the video data according to the MJPEG method; And merging the encoded image data and audio data. The method of claim 11, Generating, by the DMB receiving device, video / audio data of the subscriber; Encoding the video / audio data in the MJPEG scheme and transmitting the encoded video / audio data to the multimedia terminal; When the subscriber requests video communication, the multimedia terminal initiating communication with a counterpart terminal via a network; And transmitting, by the multimedia terminal, the video / audio data of the subscriber received from the DMB receiving apparatus to the counterpart terminal to provide the video communication service.

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