KR20060064277A - Dmb receiver in portable dab player - Google Patents

Abstract

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a portable digital audio broadcast player, wherein a portable digital audio broadcast player is used to process a video signal among digital multimedia broadcast signals received through terrestrial signals and transmit the signal to an external device so that the external device can play the video data. In the present invention, a digital multimedia broadcasting receiver is provided, and a user can receive a digital audio broadcasting service with a relatively low power consumption for a long time through a portable digital audio broadcasting player. , Laptops, PDAs, video players, etc.) so that users can receive digital video broadcasting services that use relatively high power consumption for a long time through external devices, and users do not have video playback / display functions. That the purchase of large digital audio broadcasting player, a low cost effective to allow you to provide digital video broadcasting services.

Digital audio broadcasting (DAB), digital multimedia broadcasting (DMB), portable DAB player, video signal processing

Description

Digital multimedia broadcasting receiver in portable digital audio broadcasting player {DMB receiver in portable DAB player}             

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 multimedia broadcasting receiver in a portable digital audio broadcasting player according to the present invention.

* Explanation of symbols on the main parts of the drawing

31: wireless transmit / receive module 32: analog / digital conversion module

33: demodulation module 34: error correction / decoding module

35: buffer 36: audio decoding module

37: Broadcast related data decoding module 38: USB device module

39: data storage module 40: display module

41: battery 42: speaker

43: control module

The present invention relates to a portable digital audio broadcast player, and more particularly, to process a video signal among digital multimedia broadcast signals received through terrestrial signals and transmit the signal to an external device so that the external device can play the video data. The present invention relates to a digital multimedia broadcasting receiver in a digital audio broadcasting player.

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

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

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). ) Can be used to transfer video data.

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

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 / mobile / vehicle DMB receiver, video / audio / broadcasting Receives the relevant data, decodes and plays it.

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

As described above, it can be seen that the existing Eureka-147 type DAB technology was developed exclusively for audio, and in the DMB technology established as a standard in Korea, the video playback module should be installed in the fixed / portable / vehicle DMB receiver. It can be seen that the video service can be provided.

Meanwhile, as mentioned above, the DMB receiver is a fixed DMB receiver such as a set-top box in a house, a portable DMB receiver mounted in an MP3 player, a PDA, a mobile communication terminal, or a vehicle DMB such as a set-top box or a receiver mounted in a vehicle. Can be divided into receivers.

In such a DMB receiver, a video signal received through terrestrial signals is processed (intermediate frequency conversion, analog / digital conversion, demodulation, decoding, etc.), and then a screen corresponding to the video data is displayed through a liquid crystal display.

However, such a DMB receiver, particularly a portable DMB receiver, has a problem in reproducing and displaying video data.

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

Therefore, even if the portable DMB receiver can be provided with a high quality video broadcasting service, battery power consumption due to video playback / display in the video playback module and the liquid crystal display device is increased, and thus video playback / display is impossible for a long time.

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 price of the portable DMB receiver increases by the corresponding component value, which is a burden on the user.

Therefore, while a user purchases a portable DMB receiver (hereinafter referred to as a "portable digital audio broadcast player") that is not equipped with a video playback / display function at a low cost, power consumption is reduced through this portable digital audio broadcast player. In addition to providing a relatively low digital audio broadcasting service for a long time, this portable digital audio broadcasting player can be connected to an external device (e.g., computer, laptop, PDA, video player, etc.) to consume a relatively large amount of power. There is an urgent need for a technology that enables a video broadcasting service to be provided for a long time.

The present invention has been proposed to solve the above problems and to meet the above demands. The present invention processes video signals of digital multimedia broadcasting signals received through terrestrial signals and transmits them to an external device to play the video data on an external device. It is an object of the present invention to provide a digital multimedia broadcasting receiver in a portable digital audio broadcasting player.

According to an aspect of the present invention, there is provided a portable digital audio broadcasting player comprising: a wireless receiving module for converting a frequency band of a multimedia broadcasting signal received through an antenna into an intermediate frequency band; An analog / digital conversion module for converting the multimedia broadcast signal in analog signal form converted by the wireless receiving module into a multimedia broadcast signal in digital signal form; A demodulation module for demodulating the multimedia broadcast signal converted by the analog / digital conversion module; An error correction / decoding module that corrects an error of the multimedia broadcasting signal demodulated by the demodulation module and decodes the data in the form of MPEG-4 Synchronization Layer (SL) packet or the data in the form of MPEG-2 Transport Stream (TS); A buffer for storing data in the form of MPEG-4 SL packet or data in the form of MPEG-2 TS decoded by the error correction / decoding module; A USB device module equipped with a USB interface function; And when the USB device module and the USB host module of the external device are connected, the data in the form of MPEG-4 SL packet or the data in the form of MPEG-2 TS stored in the buffer are transmitted to the external device through the USB device module. It includes a control module for controlling so as to.

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, the communication network to which the present invention is applied is referred to as a head-end 100, a transmitting station 100a and a portable DAB player (hereinafter referred to as a "portable DAB player"). 300).

The headend (the multimedia broadcasting service provider side such as a broadcaster, a communication company, etc.) 100 encodes video / audio / broadcast-related data and then transmits video / audio / broadcast-related signals through terrestrial station 100a.

The portable DAB player 300 receives a video / audio / broadcast related signal through the terrestrial wave.

In the present invention, the portable DAB player 300 is not equipped with a video playback module and a video display module, but only a video signal processing module. The video data processed by the video signal processing module is processed by an external device (eg, computer, Devices such as laptops, PDAs, video players, etc., which are equipped with video playback / display functions, so that users can watch videos through external devices.

That is, the portable DAB player 300 performs an inherent function of processing a unique function such as an audio signal (radio broadcast) and outputting the same 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.

Meanwhile, as mentioned above, the portable DAB player 300 is not equipped with a video display module. However, this means that a liquid crystal display device for displaying a high quality video is not provided, and the portable DAB player 300 is provided. The LCD preferably includes a liquid crystal display device for displaying information related to radio broadcasting (eg, radio channel information, song title, singer information, and the like).

Hereinafter, referring to FIG. 2, a digital multimedia broadcasting receiver for processing a video signal from a portable DAB player 300 and transmitting the video signal to an external device, and an external device for playing and displaying video data received from the digital multimedia broadcasting receiver (hereinafter, referred to as a digital multimedia broadcasting receiver). Will be described using the video player as an example).

2 is a block diagram of an embodiment of a digital multimedia broadcasting receiver in a portable digital audio broadcasting player according to the present invention.

As shown in FIG. 2, in the portable digital audio broadcasting player according to the present invention, a digital multimedia broadcasting receiving apparatus includes a wireless transmission / reception module (RF module) (or tuner) 31 and an analog / digital conversion module (ADC). 32, baseband demodulator 33, error correction / decoding module 34, buffer 35, audio decoder 36, broadcast related data decoding module Data Decoder (37), USB Device Module (38), Data Storage Module (Storage) 39, Display Module (Display) 40, Battery (41), Speaker (or Earphone) 42 and a main control module 43.

On the other hand, the video player 500 includes a USB host module 51, a buffer memory 52, a demultiplexer 53, a video decoder 54a, and audio decoding. A video / audio decoder 54 including a unit 54b, a display unit 55, and a speaker (or earphone) 56 are included.

The digital multimedia broadcasting receiver is driven by the power supplied from the battery 41.

The digital multimedia broadcasting receiver is connected between the USB host module 51 of the video player 500 or the user's operation signal (eg, video data external transmission request signal) through the USB device module 38 and a cable. Etc., it is preferable that an application (application program S / W) having a function of processing a video signal among multimedia broadcasting signals received through an antenna and transmitting the same to the video player 500 is mounted.

In addition, the digital multimedia broadcasting receiving apparatus reproduces an audio broadcast corresponding to a radio broadcast when a radio broadcast channel is tuned (channel selection through a tuner) by a user's operation or the like, and when a video broadcast channel is tuned, a video corresponding to a video broadcast. The data (video / audio data) is transmitted to the video player 500 side.

As shown in the figure, the audio decoding module indicated by reference numeral 36 is a module for decoding audio data for radio broadcasting, and the audio decoding unit indicated by reference numeral 54b indicates audio data for video broadcasting (preferably sound included in a video). ) Is a module that decodes.

Meanwhile, the video player 500 may be driven by electric power supplied from a built-in battery or by electric power supplied through a power line connected to an indoor outlet. Here, the battery built in the video player 500 is preferably a large capacity battery capable of playing a video for a long time.

In addition, the video player 500 is preferably equipped with a USB host function (USB host module 51) to enable data communication with the digital multimedia broadcasting receiver.

In addition, the video player 500 is a buffer memory 52 required for buffering video data received from a digital multimedia broadcasting receiver, a video decoder for extracting (demultiplexing) video data and audio data included in a multimedia broadcasting signal. It is preferable to include a multiplexer 53 and a video decoder 54 necessary for decoding the video data (video / audio data). 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 digital multimedia broadcasting receiver will be described in detail.

The wireless transmission / reception module 31 lowers the frequency of the multimedia broadcasting signal (audio signal, video signal, broadcast related signal) received through the antenna and converts the signal into an intermediate frequency (IF) band. The radio transceiver module 31 is also 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 converts the multimedia broadcasting signal converted by the analog-to-digital conversion module 32 using known orthogonal frequency division multiple demodulation (OFDM demodulation) and differential 4-phase shift keying demapping (DQPSK demapping). Is demodulated to the original multimedia broadcast signal (ie, the signal before being modulated at the head end 10 side). 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 a multimedia broadcast signal in the form of a digital signal of the baseband.

The error correction / decoding module 34 includes Reed-solomon decoding and convolution deinterleaving decoding and Viterbi decoding, which are known forward error correcting functions. The channel error of the multimedia broadcasting signal demodulated by the demodulation module 33 is detected and corrected using viterbi decoding or the like.

In addition, the error correction / decoding module 34 converts the error-corrected multimedia broadcast signal using MPEG-Synchronization Layer (SL) packet data or / and MPEG-2 TS (Transport Stream) using a known multimedia broadcast signal decoding scheme. Decode into data of the form

The buffer 35 temporarily stores data in the form of an MPEG-4 Synchronization Layer (SL) packet or data in the form of an MPEG-2 Transport Stream (TS) decoded by the error correction / decoding module 34.

In this case, when the radio broadcast channel is tuned, the audio data for radio broadcasting compressed by the MP3 (MPEG1 Layer2) method is temporarily stored in the buffer 35, and the audio data is stored in the audio decoding module 36 under the control of the control module 43. Broadcast related data included in the audio data is transmitted 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 other hand, if a video broadcasting channel is selected, the buffer 35 includes video data compressed by MPEG-4 Part 10 (H.264 / Advanced Video Coding (AVC)) and MPEG-4 Bit Sliced Arithmetic Coding (BSAC). Compressed audio data is temporarily stored.

The audio decoding module 36 outputs audio data (for radio broadcasting) output from the buffer 35 under control of the control module 43 and / or audio files stored in the data storage module 39, that is, MP3 (MPEG1). The audio data compressed by the Layer 2) method is decoded. Here, the audio data decoded by the audio decoding module 36 is output through the speaker 42 in the form of an analog signal.

The broadcast related data decoding module 37 may output broadcast related data (eg, program associated data), service information, service schedule, etc., which are output from the buffer 35 under the control of the control module 43. ), Packet data, etc.). 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 broadcast data received from the outside, in particular, broadcast-related data, a driving program, and the like, and includes a hard disk (HDD), an AND logic memory, a multimedia card (MMC, and a compact flash). Type memory), an SD memory card, a USB flash memory device (UFD), and the like.

The USB device module 38 is a data transmission / reception communication port, and is connected to the USB host module 51 of the video player 500 through a cable or the like, in particular, the buffer 35 under the control of the control module 43. It is responsible for the interface for transmitting the data in the form of MPEG-4 Synchronization Layer (SL) packet and / or the data in the form of MPEG-2 Transport Stream (TS) to the video player 500.

The control module 43 controls each module 31 to 42 of the digital multimedia broadcasting receiver, and in particular, when the USB device module 38 and the USB host module 51 of the video player 500 are connected, the buffer 35 ) Controls the moving image data stored in the control unit to be transmitted to the USB host module 51 of the moving image player 500 through the USB device module 38. Here, the control module 43 monitors the USB device module 38 and detects the connection of the video player 500 through a cable or the like.

Then, when there is a video data external transfer request command by a user's button operation or program driving, it is preferable to transmit the video data to the video player 500 side.

On the other hand, when there is no external data request request command by the user button operation or program operation, that is, when the digital multimedia broadcasting receiving apparatus and the video player 500 are not connected by a cable or the like (the user listens only to digital radio broadcasting). The control module 43 controls the buffer 35 to discard the extracted video data or to be stored in the data storage module 39. However, in consideration of the capacity of the data storage module 39, since it is impossible to store all of the video data received in real time, it is preferable to store only a predetermined time or schedule data.

As another example, when the digital multimedia broadcasting receiver and the video player 500 are not connected to each other by a cable or the like, the control module 43 controls the wireless transmission / reception module 31 to terminate the video channel selection function so as to receive a video signal. And it is preferable to stop the video signal processing accordingly so that power consumption does not occur.

In addition, each module of the digital multimedia broadcasting receiver of the present invention may be implemented by one chip or a plurality of chips.

Meanwhile, the video player 500 will be described in detail as follows.

The USB host module 51 is a data transmission / reception communication port, and is in charge of an interface for receiving video data from the digital multimedia broadcasting reception apparatus in a state connected to the USB device module 38 through a cable or the like.

The demultiplexer 53 may include moving picture data included in data of an MPEG-4 Synchronization Layer (SL) packet type and / or data of an MPEG-2 TS (Transport Stream) type received from a digital multimedia broadcasting receiver. Extract audio data and video related data (demultiplex).

The video decoding unit 54 includes a video decoding unit 54a and an audio decoding unit 54b, and the moving picture data received through the USB host module 51, that is, the moving picture data received by the digital multimedia broadcasting receiver. Decode In addition, 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.

Here, the video decoder 54a of the video decoder 54 decodes the video data compressed by the MPEG-4 Part 10 (H.264 / AVC (Advanced Video Coding)) method, and among the video decoder 54 The audio decoder 54b decodes the audio data compressed by the MPEG-4 bit sliced arithmetic coding (BSAC) method.

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 in the form of an analog signal.

As described above, when the user listens to the digital radio broadcast through the digital multimedia broadcasting receiver and wants to watch the digital video broadcast, the user connects the digital multimedia broadcasting receiver and the video player 500 to the video player 500. ), You can watch movies played.

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 having a relatively low power consumption for a long time through a portable digital audio broadcasting player, and also uses the portable digital audio broadcasting player 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 portable digital audio broadcasting player without a video playback / display function at a low cost.

Claims (3)

In the portable digital audio broadcasting player, A wireless receiving module for converting a frequency band of a multimedia broadcasting signal received through an antenna into an intermediate frequency band; An analog / digital conversion module for converting the multimedia broadcast signal in analog signal form converted by the wireless receiving module into a multimedia broadcast signal in digital signal form; A demodulation module for demodulating the multimedia broadcast signal converted by the analog / digital conversion module; An error correction / decoding module that corrects an error of the multimedia broadcasting signal demodulated by the demodulation module and decodes the data in the form of MPEG-4 Synchronization Layer (SL) packet or the data in the form of MPEG-2 Transport Stream (TS); A buffer for storing data in the form of MPEG-4 SL packet or data in the form of MPEG-2 TS decoded by the error correction / decoding module; A USB device module equipped with a USB interface function; And When the USB device module and the USB host module of the external device are connected, the data of the MPEG-4 SL packet type or the MPEG-2 TS type stored in the buffer are transmitted to the external device through the USB device module. Control module Digital multimedia broadcasting receiver in a portable digital audio broadcast player comprising a. The method of claim 1, The control module, When the external data transmission request signal is generated while the USB device module and the USB host module of the external device are connected, controlling to transmit the data in the form of MPEG-4 SL packet or the data in the form of MPEG-2 TS to the external device. A digital multimedia broadcasting receiver in a portable digital audio broadcasting player. The method according to claim 1 or 2, The control module, If there is no connection between the USB device module and the USB host module of the external device, or if an external transmission request signal is not generated, the data of MPEG-4 SL packet form or MPEG-2 TS form stored in the buffer is stored. Digital multimedia broadcasting receiver in a portable digital audio broadcasting player, characterized in that the control to be discarded.

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