KR100732889B1 - Digital Broadcast Receiver - Google Patents

Abstract

The present invention discloses a technology for processing DAB signals in digital broadcasting signals by itself, and extracting video data for the DMB signal and then providing the extracted data to an external device. According to the present invention, the low power consumption DAB service can be used alone for a long time, while the high power consumption digital video service can be connected to an external device (eg, computer, laptop, PDA, video player, etc.) for a long time. In addition, the user can purchase a device that does not have a video playback / display function at a low cost, thereby enabling the user to enjoy DMB service.

Digital Audio Broadcasting (DAB), Digital Multimedia Broadcasting (DMB)

Description

Digital Broadcast Receiver {Digital Broadcast Receiver}

1 is a configuration diagram of an embodiment of a communication network to which the present invention is applied.

2 is a block diagram of an embodiment of a digital broadcast receiver according to the present invention;

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The present invention relates to a digital broadcast receiver, and more particularly, to a DAB signal of a digital broadcast signal itself, and to extracting the video data for a DMB signal and providing the data externally so that the video data can be reproduced by an external device. Relates to a device.

Digital Multimedia Broadcasting (DMB) refers to a broadcast service that provides various multimedia signals such as audio and video to digital fixed / portable / vehicle DMB receivers.

Meanwhile, Eureka-147-type digital audio broadcasting (DAB) technology among DMB technologies has been enacted / commercially used in Europe and is currently used as a technology to replace existing FM radio with digital audio broadcasting in various countries around the world. It is becoming.

In particular, while conventional DAB technology can only transmit audio data, DMB technology, which was established as a standard in Korea, is based on the MPEG-4 (MPEG-4) and Motion Object Transfer Protocol (MOT). ) Allows video data transmission.

The DMB technology established as a standard in Korea is briefly described as follows.

The head-end (multimedia broadcasting service provider such as broadcaster, telecommunication company, etc.) encodes video / audio / broadcasting data and transmits it through terrestrial waves, and in fixed / portable / vehicle DMB receivers, video / audio / broadcasting Receives the relevant data, decodes and plays it.

The video compression method is H.264 / AVC (Advanced Video Coding), which is MPEG-4 Part 10, and the audio compression method is MPEG-4 Bit Sliced Arithmetic Coding (BSAC). Multimedia broadcast data (ie, video data, audio data, and broadcast-related data) are transmitted and received in the form of MPEG-4 Synchronization Layer (SL) packets and MPEG-2 Transport Stream (TS), for example, via terrestrial waves. Convolution interleaving codes, Viterbi codes, Reed-Solomon codes, and the like are used as the transmission channel codes.

The existing Eureka-147 type DAB technology was developed exclusively for audio, and the DMB technology, which was established as a standard in Korea, can be provided only when a video playback module is installed in a fixed / portable / vehicle DMB receiver. Can be.

On the other hand, the DMB receiver may be divided into a fixed DMB receiver such as a home set-top box, a portable DMB receiver installed in an MP3 player or a PDA or a mobile communication terminal, and a vehicle DMB receiver.

These DMB receivers perform a series of signal processing (middle frequency conversion, analog / digital conversion, demodulation, decoding, etc.) on a video signal received through terrestrial wave, for example, and then display a screen corresponding to the video data through a liquid crystal display. Display.

However, DMB receivers, particularly portable DMB receivers, have problems in reproducing and displaying video data.

In order to display a screen corresponding to high quality video data during DMB broadcasting, a lot of power is consumed in a video reproducing module for reproducing a large amount of video data and a liquid crystal display for displaying a high quality screen.

Therefore, even though the portable DMB receiver can be provided with a high-definition video broadcasting service, the battery power consumption due to the video playback / display in the video playback module and the liquid crystal display device is increased so that video playback / display cannot be performed for a long time. have.

In addition, when the high-density video playback module and the high-definition liquid crystal display device are mounted on the portable DMB receiver, the portable DMB receiver price increases by the corresponding component price, thereby putting a burden on the user.

Therefore, with the purchase of a DMB receiver (hereinafter referred to as a "light DMB receiver") that does not have a video playback / display function, a low power consumption DAB service is provided for a long time by using the light DMB receiver alone. On the other hand, there is an urgent need for a technology that enables the use of a light DMB receiver connected to an external device (eg, a computer, a laptop, a PDA, a video player, etc.) to provide a high power consumption digital video broadcasting service for a long time.

The present invention has been proposed to solve the above problems and to meet the above requirements. While the DAB signal is self-processed among the digital broadcast signals, the DMB signal is extracted from the video data and provided to the outside to provide the video data. It is an object of the present invention to provide a device configured to be played on an external device.

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Hereinafter, exemplary embodiments of the present invention will be described in detail with reference to the accompanying drawings. In the following description of the present invention, detailed descriptions of well-known functions or configurations will be omitted if it is determined that the detailed description of the present invention may unnecessarily obscure the subject matter of the present invention. Terms to be described later are terms defined in consideration of functions in the present invention, and may be changed according to intentions or customs of users or operators. Therefore, the definition should be made based on the contents throughout the specification.

1 is a configuration diagram of an embodiment of a communication network to which the present invention is applied.

As shown in Fig. 1, a communication network to which the present invention is applied includes a headend 100, a transmitting station 100a and a write DMB receiver 300.

The head end 100 encodes video / audio / broadcasting related data and transmits video / audio / broadcasting related signals to the terrestrial wave through the transmitting station 100a.

The light DMB receiver 300 receives a video / audio / broadcast related signal through the terrestrial wave.

The light DMB receiver 300 is not equipped with a video playback module and a video display module but is equipped with only a video signal processing module, and the video data processed by the video signal processing module is output to an external device (computer, notebook, PDA, video player, etc.). Devices with video playback / display capabilities), allowing users to watch videos through external devices.

That is, the light DMB receiver 300 performs a native function such as processing an audio signal (radio broadcast) and outputting it through a speaker, and also outputs a video signal processed through a data communication function with an external device. Performs the function of transmitting to an external device.

On the other hand, the light DMB receiver 300 described above is not equipped with a video display module, which means that there is no equipped with a liquid crystal display device for displaying a high-quality video, for example, information related to DAB broadcasting (radio channel It is not excluded that a liquid crystal display device for displaying information, song title, singer information, etc.) is provided.

Hereinafter, a configuration in which the light DMB receiver 300 processes and externally transmits a video signal and an external device (described as a video player) for receiving, playing back, and displaying video data will be described with reference to FIG. 2.

2 is a diagram illustrating a configuration related to a function of processing and externally transmitting a video signal in a digital broadcasting receiver (ie, a "light DMB receiver") according to the present invention.

A configuration related to a function of processing and externally transmitting a video signal in the light DMB receiver of the present invention includes a radio transceiver module (RF module) (or tuner) 31, an analog / digital conversion module (ADC) 32, and a demodulation module. (Baseband Demodulator) 33, Error Correction / Decoding Module 34, Buffer 35, Audio Decoder 36, Broadcast-Related Data Decode Module 37, USB Device (USB Device) module 38, data storage module 39, display module 40, battery 41, speaker (or earphone) 42 and the control module 43 is configured.

The video player 500 includes a USB host module 51, a buffer memory 52, a demultiplexer 53, a video decoder 54a, and an audio decoder 54b. And a decoder (Video / Audio Decoder) 54, a display unit 55, and a speaker (or earphone) 56.

The write DMB receiver 300 is driven by the power supplied from the battery 41.

The light DMB receiver 300 is connected to the USB host module 51 of the video player 500 through a USB device module 38 and a cable or provided with a user manipulation signal (eg, a request for external transmission of video data). It is preferable that an application (application program) for signal processing a video signal and transmitting the same to the video player 500 is mounted.

The write DMB receiver 300 plays an audio broadcast corresponding to a radio broadcast when a radio broadcast channel is tuned by a user operation (for example, selecting a channel through a tuner), and if the video broadcast channel is tuned, video data corresponding to a video broadcast. (Video / audio data) is transmitted to the video player 500.

In connection with audio reproduction, the audio decoding module 36 of the light DMB receiver 300 is a module for decoding audio data for radio broadcasting, and the audio decoding unit 54b of the video player 500 is provided with audio data for video broadcasting. Preferably a sound included in the video).

The video player 500 may be driven by power supplied from a built-in battery or may be driven by power supplied through home power. Here, the battery built in the video player 500 is preferably a large capacity battery capable of playing a video for a long time.

The video player 500 is preferably equipped with a USB host module 51 that is responsible for the USB host function to enable data communication with the write DMB receiver 300.

The video player 500 is a demultiplexer for extracting (demultiplexing) the buffer memory 52 necessary for buffering the video data transmitted from the light DMB receiver 300, the video data and the audio data included in the multimedia broadcasting signal. 53, it is preferable to include a video decoding unit 54 necessary for decoding the video data (video / audio data). Here, the demultiplexer 53 and the video decoder 54 may be implemented by hardware or software, and the buffer memory 52 may be implemented by a general memory (RAM).

Hereinafter, each component of the write DMB receiver 300 will be described.

The wireless transmission / reception module 31 lowers the frequency of the multimedia broadcasting signal (audio signal, video signal, broadcast related signal) received by the antenna and converts the signal into an intermediate frequency band. The radio transceiver module 31 is equipped with a known channel tuning function (tuner function).

The analog / digital conversion module 32 converts the multimedia broadcast signal in the analog signal form converted by the wireless transmission / reception module 31 into the multimedia broadcast signal in the digital signal form.

The demodulation module 33 uses the known orthogonal frequency division multiple demodulation (OFDM) and differential four-phase shift keying demapping (DQPSK demapping) for the multimedia broadcast signal converted by the analog / digital conversion module 32. Demodulate into a multimedia broadcast signal, i.e., a signal prior to modulation in the headend 10. FIG. Here, the demodulation module 33 performs a demodulation process by converting the multimedia broadcast signal in the form of a digital signal of the intermediate frequency band into the multimedia broadcast signal in the form of a digital signal of the baseband.

The error correction / decoding module 34 is a reed-solomon decoding and convolutional deinterleaving decoding function that is a known forward error correcting function for the multimedia broadcast signal demodulated by the demodulation module 33. Channel errors are detected and corrected using convolution deinterleaving decoding and Viterbi decoding.

The error correction / decoding module 34 decodes the multimedia broadcast signal on which the above error correction has been performed, into multimedia broadcast data in the form of MPEG-4 SL packet or MPEG-2 TS, for example, using a well-known multimedia broadcast signal decoding method.
The radio transceiver module 31, the analog / digital conversion module 32, the demodulation module 33, and the error correction / decoding module 34 described above are generally known to be provided in an apparatus for receiving digital broadcast. Therefore, in the present specification, a component that performs the sum of these components will be referred to as a "digital broadcast receiving module".

The buffer 35 temporarily stores the multimedia broadcast data decoded by the error correction / decoding module 34.

When the "radio broadcast channel" is tuned, the audio data for MP3 (MPEG1 Layer2) compressed radio broadcasting is temporarily stored in the buffer 35, and the audio data is transmitted to the audio decoding module 36 by the control module 43. The broadcast related data included in the data is transferred to the broadcast related data decoding module 37. For reference, in the DAB technology, broadcast related data is inserted into audio data for radio broadcasting.

On the contrary, if the "video broadcast channel" is tuned, the buffer 35 temporarily stores MPEG-4 Part 10 (H.264 / AVC) compressed video data and MPEG-4 BSAC compressed audio data.

The audio decoding module 36 decodes the audio data (for radio broadcasting) output from the buffer 35 by the control module 43 or the audio file stored in the data storage module 39, that is, the audio data compressed by the MP3 method. Perform the function. The audio data decoded by the audio decoding module 36 is output through the speaker 42 as an analog signal.

The broadcast related data decoding module 37 outputs broadcast related data (eg, program associated data, service information (broadcast schedule, etc.), packet data, etc.) output from the buffer 35 by the control module 43. Decode Here, the broadcast related data decoded by the broadcast related data decoding module 37 is displayed through the display module 40.

The data storage module 39 stores multimedia broadcasting data received from the outside, in particular, broadcasting related data and driving programs, and includes a hard disk (HDD), a NAND memory, a multimedia card (MMC, and a compact flash memory). , An SD memory card, a USB flash memory device (UFD), or the like.

The USB device module 38 may be connected to the USB host module 51 of the video player 500 via a cable or the like as a data transmission / reception communication port, in which case the data, in particular, the multimedia broadcast data output from the buffer 35 is controlled. It is responsible for the interface sent by module 43 to video player 500.

The control module 43 controls the various modules 31 to 42 of the write DMB receiver 300, and in particular, when the USB device module 38 and the USB host module 51 of the video player 500 are connected to each other, The video data stored in 35 is controlled to be transmitted to the USB host module 51 of the video player 500 through the USB device module 38. The control module 43 monitors the USB device module 38 and detects the connection of the video player 500 through a connection such as a cable.

When the video data external transmission request command (eg, user button operation, program driving, etc.) is provided, it is preferable to transmit the video data to the video player 500.

When there is no video data external transmission request command, that is, when the light DMB receiver 300 and the video player 500 are not connected and the user listens only to the digital radio broadcast, the control module 43 controls the buffer 35. To discard the pre-extracted video data or to store it in the data storage module 39. However, since it is impossible to store all of the video data received in real time in consideration of the capacity of the data storage module 39, it is preferable to control to store only a predetermined time or a predetermined capacity.

In another embodiment, when the light DMB receiver 300 and the video player 500 are not connected, the control module 43 controls the wireless transmission / reception module 31 to cancel the video channel selection function so as to cancel the video signal. It is also desirable to stop the reception and hence the video signal processing so that power is not consumed.

Each module of the write DMB receiver 300 may be implemented by one or a plurality of chips.

Hereinafter, each component of the video player 500 will be described.

The USB host module 51 is a data transmission / reception communication port. The USB host module 51 is an interface for receiving video data transmitted from the light DMB receiver 300 while being connected to the USB device module 38 of the light DMB receiver 300 through a cable or the like. In charge.

The demultiplexer 53 extracts video data, audio data, and video related data included in the multimedia broadcast data in the form of MPEG-4 SL packet or MPEG-2 TS received from the light DMB receiver 300 (reverse multiple).

The video decoder 54 includes a video decoder 54a and an audio decoder 54b, and decodes the video data received from the write DMB receiver 300 through the USB host module 51. The video decoder 54a further performs a function of decoding the video related data. Such video related data is displayed on the screen through the display unit 55.

Among the moving picture decoding units 54, the video decoding unit 54a decodes MPEG-4 Part 10 (H.264 / AVC) compressed video data, and the audio decoding unit 54b performs MPEG-4 BSAC compressed audio data. Decode

The video data decoded by the video decoder 54a is displayed through the display unit 55, and the audio data decoded by the audio decoder 54b is output through the speaker 56 as an analog signal.

When the user listens to DAB broadcast by the light DMB receiver 300 alone, and wants to watch a video broadcast, the user connects the light DMB receiver 300 and the video player 500 to play the movie played by the video player 500. You can enjoy the back.

While the content of the present invention has been described by way of examples, the embodiments of the present invention are merely illustrative of the present invention and should not be construed as limiting the scope of the present invention. Those skilled in the art to which the present invention pertains may modify or alter the present invention in various forms within the principles and scope described in the claims herein.

As described above, the present invention enables a user to receive a digital audio broadcasting service with a relatively low power consumption through a light DMB receiver for a long time and uses the light DMB receiver as an external device (eg, computer, laptop, PDA, video player). Etc.) so that digital video broadcasting service, which consumes relatively high power consumption, can be provided for a long time through an external device.

In addition, the present invention has the effect of allowing the user to receive a digital video broadcasting service by purchasing a light DMB receiver that is not equipped with a video playback / display function at a low cost.

Claims (4)

A digital broadcast reception module configured to tune to a DAB broadcast channel and a DMB broadcast channel, receive digital broadcast signals therefrom, and output digital broadcast data through an error correction and decoding process according to a user's selection; A buffer module for storing digital broadcast data generated by the digital broadcast receiving module; An audio decoding module for decoding digital audio data according to DAB broadcasting; A USB module for USB connection; And When the USB connection to the external digital video player through the USB module is not established, when the digital broadcast receiver module is tuned to a specific DAB broadcast channel, the digital audio data for the DAB broadcast stored in the buffer module is converted into the audio. It provides a decoding module to control the output of the DAB broadcast audio decoded by the audio decoding module, and when a USB connection to the external digital video player through the USB module is established, a specific DMB through the digital broadcast receiving module A control module for controlling digital multimedia data for DMB broadcasting stored in the buffer module to be transmitted to the connected external digital video player through the USB module when tuned to a broadcasting channel; Digital broadcast receiver comprising a. delete delete The method of claim 1, And the control module controls the digital broadcast receiving module to prevent tuning for a DMB broadcast channel when a USB connection with an external digital video player through the USB module is not established.

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