KR20060074785A - Digital broadcasting network interface module for transmitting data with wireless network device and method for transmitting data using thereof - Google Patents

Abstract

The present invention provides a digital broadcasting network interface module for data transmission with a wireless network device, comprising: a channel tuning unit for tuning a radio wave in an RF form to tune a channel and shifting the tuned signal to an IF type frequency; A demodulator for demodulating the IF signal to generate digital data in MPEG-2 TS format, an MPEG-2 decoder for converting the MPEG-2 TS data into raw audio video data, and the wireless network device. An audio format determination unit for determining whether the required audio data is in a Dolby digital form or a PCM stereo form, and when the audio format determination unit determines the audio data format as a PCM stereo form, downsamples the raw audio data to form a PCM stereo form. An audio downsampling unit for converting the An additional information generation and downsampling unit for inserting additional information necessary for the raw audio video data to convert to MPEG-4 format, and downsampling the video data when necessary; and the raw audio video data or the PCM with the additional information inserted therein. An MPEG-4 encoding unit which encodes data in MPEG-4 format using audio data converted to stereo form, and performs an interface with the wireless network device, and at the request of the wireless network device, The present invention relates to a digital broadcast network interface module for data transmission with a wireless network device including an Ethernet control unit for transmitting data to the wireless network device through an access point.

According to the present invention, a separate network interface module is converted by converting the MPEG-2 signal received through the digital broadcasting network interface module into a signal according to the MPEG-4 standard for use in a wireless network device and transmitting the same through the wireless network interface. It is possible to receive digital broadcasts from a wireless network device without mounting.

MPEG-2, MPEG-4, Data Conversion, Wireless Networks, Portable Media Players

Description

Digital Broadcasting Network Interface Module for Data Transmission with Wireless Network Device and Data Transmission Method Using Them

1 is a block diagram of a digital broadcast network interface module for data transmission with a wireless network device in accordance with the present invention.

2 is a flowchart of a data transmission method using a digital broadcast network interface module according to the present invention.

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

100: digital broadcast network interface module

110: channel tuning unit 120: demodulation unit

130: MPEG-2 decoding unit 140: audio format determination unit

150: audio downsampling unit 160: additional information generation and downsampling unit

170: MPEG-4 encoding unit 180: Ethernet control unit

200: wireless network device

The present invention relates to a digital broadcast network interface module for data transmission with a wireless network device and a data transmission method using the same. More specifically, the MPEG-2 signal received through the digital broadcast network interface module is used in a wireless network device. In order to transmit data to a wireless network device that can receive digital broadcasting from a wireless network device without installing a separate network interface module by converting the signal according to the MPEG-4 standard and transmitting it through the wireless network interface, A digital broadcast network interface module and a data transmission method using the same.

As the transmission standard for terrestrial digital broadcasting is confirmed, the spread of digital broadcasting receivers is increasing. Such terrestrial digital broadcasting uses a stream encoded by the MPEG-2 method. MPEG-2 is losslessly encoded and used in devices with broadcast streams or mass storage media.

The digital broadcast receiver set-top box that functions to receive MPEG-2 broadcast data is composed of front-end and back-end inside the set-top box. The digital broadcasting signal is transmitted to the rear end through the tuning and demodulation, etc., in the form of MPEG-2 TS (transport stream).

 This signal processing step is processed inside the set-top box, and in order to share data with other devices through an interface such as IEEE 1394, it can be transmitted after signal processing is generally performed at the rear end.

Also, with the development of information and communication technology, portable (hand-held or portable) media players are becoming popular. These portable media players have a small storage capacity due to the nature of the product, and thus cannot handle a large amount of data. Therefore, MPEG-4 standard, not MPEG-2 standard, is used to process data. The MPEG-4 scheme is a lossy encoding method, which is used in a networking environment using a relatively small capacity storage medium or insufficient bandwidth due to a high compression ratio. These portable media players are typically configured to connect to devices such as PCs to download or upload data, and often have small displays. In addition, due to the development of wireless communication technology, the portable media player may be configured to include a wireless network interface such as a wireless LAN or a Bluetooth.

The portable media player including the wireless network interface, that is, the wireless network device, processes the media data by using the MPEG-4 standard, not the MPEG-2 standard, for efficient use of wireless network resources as well as a small amount of storage.

Therefore, in order to use the MPEG-2 signal received through the digital broadcasting network interface module in a wireless network device, there is a need for a method of converting the MPEG-2 signal into a signal according to the MPEG-4 standard and transmitting it through the wireless network interface. It's growing.

It is an object of the present invention to convert a MPEG-2 signal received through a digital broadcast network interface module into a signal according to the MPEG-4 standard for use in a wireless network device, and to transmit it through a wireless network interface to provide a separate network interface module. The present invention provides a digital broadcast network interface module and a data transmission method using the same for data transmission with a wireless network device capable of receiving digital broadcast in a wireless network device without mounting.

In order to achieve the above technical problem, the present invention is a digital broadcast network interface module for data transmission with a wireless network device, and tunes a radio wave in the form of broadcast RF to tune the channel and transition the tuned signal to a frequency in the form of IF A channel tuner to demodulate the demodulated IF signal to generate digital data in MPEG-2 TS format, an MPEG-2 decoder to convert the MPEG-2 TS data into raw audio video data, An audio format determination unit for determining whether the audio data required by the wireless network device is a Dolby digital form or a PCM stereo form; and when the audio format determination unit determines the audio data format as a PCM stereo form, down-samples raw audio data to PCM. An audio downsampling unit for converting to a stereo form; An additional information generation and downsampling unit which inserts additional information necessary for the raw audio video data to convert the audio audio video data into the MPEG-4 format and downsamples the video data when necessary, and the raw audio having the additional information inserted therein. An MPEG-4 encoding unit which encodes data in MPEG-4 format using video data or audio data converted into the PCM stereo form, and performs an interface with the wireless network device, A digital broadcasting network interface module for data transmission with a wireless network device including an Ethernet control unit for transmitting MPEG-4 format data to the wireless network device through an AP is provided.

In the digital broadcast network interface module for data transmission with a wireless network device according to the present invention, the demodulator demodulates a broadcast signal modulated using 8VSB, QAM, or QPSK, and demodulates DATA [0: 7], It is preferable to generate MPEG-2 TS data configured in the form of Valid and Sync.

In addition, in the digital broadcasting network interface module for data transmission with a wireless network device according to the present invention, the side information generation and downsampling unit, the MPEG-2 TS data is high-definition (HD) data and the raw audio video data In the case of converting to P, it is preferable to downsample it to fit the picture quality supported by the wireless network device using the MPEG-4 standard.

Further, in the digital broadcasting network interface module for data transmission with a wireless network device according to the present invention, the Ethernet control unit, when receiving a command from the wireless network device, interprets the command by the channel tuning unit and the copy It is preferable to transmit to the grandfather, the MPEG-2 decoding unit, the MPEG-4 encoding unit, and the audio format determination unit.

The present invention also provides a data transmission method using a digital broadcast network interface module for data transmission with a wireless network device, the method comprising: receiving digital broadcast signals to generate digital data in the form of MPEG-2 TS; Recognizing a wireless network device connected through an interface; receiving a command for requesting media data transmission from the wireless network device; decoding digital data of the MPEG-2 TS form to generate raw audio video data; And converting the raw audio video data into the MPEG-4 standard, and transmitting the converted data into the MPEG-4 standard to the wireless network device through the wireless network. data It provides a data transmission method using a digital broadcast network interface module to transmit.

In the data transmission method using a digital broadcast network interface module for data transmission with a wireless network device according to the present invention, the step of receiving the digital broadcast signal to generate digital data in the form of MPEG-2 TS, 8VSB method, It is preferable to generate MPEG-2 TS data in the form of DATA [0: 7], Valid, Sync by receiving and demodulating the modulated broadcast signal using the QAM method or the QPSK method.

Further, in the data transmission method using the digital broadcasting network interface module for data transmission with the wireless network device according to the present invention, the step of converting the raw audio video data to MPEG-4 standard, the raw audio video data And inserting additional information according to MPEG-4 conversion and performing downsampling.

In addition, in the data transmission method using a digital broadcasting network interface module for data transmission with a wireless network device according to the present invention, inserting additional information according to MPEG-4 conversion to the raw audio video data and performing downsampling If the MPEG-2 TS data is high-definition (HD) data and converts it to the raw audio video data, downsampling the MPEG-2 TS data to suit the image quality supported by the wireless network device using the MPEG-4 standard. It is desirable to.

In the data transmission method using a digital broadcast network interface module for data transmission with a wireless network device according to the present invention, the step of converting the raw audio video data to MPEG-4 standard, PCM stereo in the wireless network device Receiving a data request in a format; downsampling raw audio data in Dolby Digital format to audio data in PCM stereo format; and using raw video data and audio data in the PCM stereo format to It is preferred to include the step of converting to data.

Hereinafter, a digital broadcast network interface module for data transmission with a wireless network device of the present invention and a data transmission method using the same will be described in more detail with reference to the accompanying drawings.

The conventional network interface module corresponds to the broadcast receiver of the digital broadcast receiver and corresponds to the front end in the set top box structure. In other words, it only played the role of handing over the digital broadcasting signal transmitted in RF form to MPEG-2 TS form at the rear end through tuning and demodulation.

The digital broadcast network interface module for data transmission with the wireless network device of the present invention separates the conventional network interface module from the digital broadcast receiver and receives data conversion and wireless network interface for data transmission with the wireless network device. Digital broadcast data can be played or stored in wireless network devices as well as set-top boxes.

1 is a block diagram of a digital broadcast network interface module for data transmission with a wireless network device in accordance with the present invention.

As shown, the digital broadcast network interface module 100 for data transmission with the wireless network device according to the present invention includes a channel tuning unit 110, a demodulation unit 120, an MPEG-2 decoding unit 130, An audio format determination unit 140, an audio downsampling unit 150, an additional information generating and downsampling unit 160, an MPEG-4 encoding unit 170, and an Ethernet control unit 180 are included. In addition, the digital broadcast network interface module 100 for data transmission with the wireless network device according to the present invention is connected to the wireless network device 200 through the wireless network interface. Wireless network device 200 may be, for example, a portable media player supporting a wireless network or a mobile phone supporting a wireless network.

The channel tuning unit 110 tunes a radio wave of a broadcast RF type to tune a channel and shifts the tuned signal to a frequency of an IF type.

The demodulator 120 demodulates the shifted IF signal to generate digital data in MPEG-2 TS format.

In general, digital terrestrial broadcasting is modulated and transmitted in 8VSB form, and digital modulated signals are transmitted using QAM and digital satellite broadcasting using QPSK. The demodulator 120 demodulates the received signal according to this standard and then generates MPEG-2 TS data in the form of DATA [0: 7], Valid, Sync.

The MPEG-2 decoding unit 130 converts the MPEG-2 TS data generated by the demodulator 120 into raw audio video data.

The MPEG-2 decoding is for encoding according to the standard required by the wireless network device 200 is MPEG-4.

The audio format determination unit 140 determines whether audio data required by the wireless network device 200 is in Dolby digital form or PCM stereo form.

That is, the audio format required by the wireless network device 200 is received through a wireless network to determine whether the digital format is Dolby or PCM stereo. This determination is related to the bandwidth of the wireless network interface or the format supported by the wireless network device 200.

The audio downsampling unit 150 downsamples the raw audio data and converts the audio data format into the PCM stereo form when the audio format determiner 140 determines the audio data format to be the PCM stereo form.

The additional information generating and downsampling unit 160 inserts additional information necessary for the raw audio video data to convert the raw audio video data into the MPEG-4 format and downsamples the video data when necessary.

For example, if the received broadcast data is high-definition (HD) data and converted to raw audio video data, it may be different from the picture quality supported by the wireless network device 200 even if it is converted to MPEG-4 as it is. Therefore, it is advantageous in terms of efficient use of the wireless network to perform downsampling to fit the picture quality supported by the wireless network device 200 using the MPEG-4 standard.

The MPEG-4 encoding unit 170 encodes the data into MPEG-4 format using raw audio video data having additional information inserted therein or audio data converted into PCM stereo format. That is, if the wireless network device 200 requires PCM data, the raw video data and audio data converted into PCM stereo format are encoded into MPEG-4 format data, and the wireless network device 200 uses Dolby. If digital data is required, raw audio video data is used to encode the data in MPEG-4 format.

The Ethernet controller 180 performs an interface with the wireless network device 200 and transmits MPEG-4 format data to the wireless network device 200 through the AP at the request of the wireless network device 200.

For example, when a channel change command is received from the wireless network device 200, the channel tuner 110, the demodulator 120, and the MPEG-2 are generated by generating a command to receive and transmit the corresponding channel to the external device 200. The decoding unit 130, the MPEG-4 encoding unit 170, and the audio format determination unit 140 may be transmitted to perform a corresponding command.

2 is a flowchart of a data transmission method using a digital broadcast network interface module according to the present invention.

First, the digital broadcast network interface module receives the digital broadcast signal and generates digital data in the form of MPEG-2 TS (S110).

In general, digital terrestrial broadcasting is modulated and transmitted in 8VSB form, and digital modulated signals are transmitted using QAM and digital satellite broadcasting using QPSK. Step S110 demodulates the received signal according to this standard and then generates MPEG-2 TS data in the form of DATA [0: 7], Valid, Sync.

Thereafter, the wireless network device connected through the interface to the wireless network is recognized (S120). Such wireless network device recognition is performed through a wireless network interface, and can then receive a command from the wireless network device and process it.

Thereafter, a command for requesting media data transmission is received from the wireless network device (S130). In other words, it receives a command for requesting transmission of digital data in MPEG-2 TS format generated by the digital broadcasting network interface module in an image quality and audio format suitable for a wireless network device.

Subsequently, raw audio video data is generated by decoding digital data of MPEG-2 TS format (S140). This step is the first generation of raw audio video data for conversion to the MPEG-4 standard.

Thereafter, the generated raw audio video data is converted into MPEG-4 standard (S150).

Thereafter, the data converted to the MPEG-4 standard is transmitted to the wireless network device (S160).

The conversion of the raw audio video data generated in step S150 to the MPEG-4 standard may vary depending on the format requested by the wireless network device.

That is, when the raw audio video data is converted into the MPEG-4 standard, additional information according to the MPEG-4 conversion may be inserted into the raw audio video data, and downsampling may be performed.

For example, if the MPEG-2 TS data generated by the digital broadcasting network interface module is high definition (HD) data and is converted into the raw audio video data, converting the data to the MPEG-4 standard as it is is a waste of wireless network resources. There will also be no need to transmit high picture quality that wireless network devices do not support.

Therefore, it is advantageous for efficient use of the wireless network to downsample and transmit such high quality data to suit the image quality supported by the wireless network device.

Also, in case of audio data, if the wireless network device requires data in PCM stereo format, the audio data in Dolby Digital data format is downsampled to audio data in PCM stereo format without using the Dolby Digital data format. The data can be converted and transmitted.

Although the present invention has been described in detail, this is for illustrative purposes only, and the protection scope of the present invention is not limited thereto, and the protection scope of the present invention is defined through the description of the claims.

As described above, according to the present invention, the MPEG-2 signal received through the digital broadcasting network interface module is converted into a signal according to the MPEG-4 standard for use in a wireless network device, and then transmitted through the wireless network interface. It is possible to receive digital broadcasts from a wireless network device without mounting a network interface module.

Claims (9)

A digital broadcast network interface module for data transmission with a wireless network device, A channel tuner that tunes a radio wave in a broadcast RF form and tunes a channel and shifts the tuned signal to an IF type frequency; A demodulator for demodulating the shifted IF signal to generate digital data in MPEG-2 TS form; An MPEG-2 decoding unit for converting the MPEG-2 TS data into raw audio video data; An audio format determination unit for determining whether audio data required by the wireless network device is in Dolby digital form or PCM stereo form; An audio downsampling unit for downsampling raw audio data and converting the audio data format into a PCM stereo form when the audio format determination unit determines the audio data format as a PCM stereo form; An additional information generation and downsampling unit for inserting additional information necessary for the raw audio video data to convert the raw audio video data into MPEG-4 format and downsampling the video data when necessary; An MPEG-4 encoding unit for encoding the MPEG-4 format data using the raw audio video data having the additional information inserted therein or the audio data converted into the PCM stereo form; An Ethernet control unit which interfaces with the wireless network device and transmits the MPEG-4 format data to the wireless network device through an access point (AP) at the request of the wireless network device. Digital broadcast network interface module for data transmission with a wireless network device comprising a. The method of claim 1, wherein the demodulation unit, Data transmission with a wireless network device that generates MPEG-2 TS data in the form of DATA [0: 7], Valid, Sync by demodulating a modulated broadcast signal using 8VSB, QAM or QPSK. Digital Broadcast Network Interface Module. The method of claim 1, wherein the additional information generating and downsampling unit, When the MPEG-2 TS data is high definition (HD) data and converted to the raw audio video data, the MPEG-2 TS data is downsampled to conform to the image quality supported by the wireless network device using the MPEG-4 standard. Digital broadcasting network interface module for data transmission with. The method of claim 1, wherein the Ethernet control unit, When receiving a command from the wireless network device, the command is interpreted and transmitted to the channel tuning unit, the demodulation unit, the MPEG-2 decoding unit, the MPEG-4 encoding unit, and the audio format determination unit. And a digital broadcast network interface module for data transmission with a wireless network device. A data transmission method using a digital broadcast network interface module for data transmission with a wireless network device, Receiving digital broadcast signals to generate digital data in the form of MPEG-2 TS; Recognizing a wireless network device connected via an interface to the wireless network; Receiving an instruction requesting media data transmission from the wireless network device; Generating raw audio video data by decoding the digital data of the MPEG-2 TS format; Converting the raw audio video data to MPEG-4 standard; Transmitting the data converted into the MPEG-4 standard to the wireless network device through the wireless network. Data transmission method using a digital broadcast network interface module for data transmission with a wireless network device comprising a. The method of claim 5, Receiving the digital broadcast signal and generating digital data in the form of MPEG-2 TS, Receives demodulated broadcast signal using 8VSB method, QAM method or QPSK method and demodulates it to generate MPEG-2 TS data composed of DATA [0: 7], Valid, Sync. Data transmission method using a digital broadcast network interface module for data transmission. The method of claim 6, Converting the raw audio video data to MPEG-4 standard, And inserting additional information according to MPEG-4 conversion into the raw audio video data and performing downsampling. The method of claim 7, wherein Inserting additional information according to MPEG-4 conversion into the raw audio video data and performing downsampling, If the MPEG-2 TS data is high-definition (HD) data and converts it to the raw audio video data, downsampling the MPEG-2 TS data to suit the image quality supported by the wireless network device using the MPEG-4 standard. And a digital broadcast network interface module for data transmission with a wireless network device. The method of claim 7, wherein Converting the raw audio video data to MPEG-4 standard, Receiving a data request in PCM stereo format at the wireless network device; Downsampling raw audio data in Dolby Digital format into audio data in PCM stereo format, Converting the raw video data and the audio data in the PCM stereo format into MPEG-4 standard data; Data transmission method using a digital broadcast network interface module for data transmission with a wireless network device comprising a.

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