KR101370572B1 - System for low power dmb - Google Patents

Abstract

The present invention relates to a low power DMB broadcast system which reduces a transmission delay in a low power live broadcast network and is a simplified system with an AVC encoder and an ensemble multiplexer in one united body. The system comprises: an AVC encoder including a video encoder which compresses and encodes video data using an MPEG-4 AVC(H.264) technology and an audio encoder which compresses and encodes audio data using an MPEG-4 BSAC technology; an ensemble multiplexer which multiplexes the video data and the audio data compressed and encoded through the AVC encoder and generates and transmits a digital stream; and an integrated management unit which integrally controls the AVC encoder and the ensemble multiplexer, both of which are combined into one body. The system is simplified and miniaturized to be suitable for a lower power DMB broadcast as the ensemble multiplexer and the AVC encoder, which are used for the low power DMB broadcast, are combined into one body as hardware. Therefore, the low power DMB broadcast system of the present invention improves a transmission speed, can be installed in a small space, and reduces manufacturing and maintenance costs. [Reference numerals] (400) Integrated management unit; (AA) Service multiplexing unit

Description

Low Power DMB Broadcasting System {System for Low Power DMV}

The present invention relates to a low power DMB broadcasting system, and more particularly, to an AVC encoder and an ensemble multiplexer integrated to reduce transmission delay in a low power live broadcasting network and to a simplified low power DMB broadcasting system.

In general, terrestrial digital multimedia broadcasting (DMB) technology is a technology for providing a terrestrial DMB service by transmitting terrestrial DMB contents such as audio, data, and multimedia to a user terminal while moving through a terrestrial DMB network.

Current terrestrial DMB networks are dedicated networks consisting of dedicated interface technologies such as Service Transport Interface (STI), Ensemble Transport Interface (ETI), and EN 300-401 Coded Orthogonal Frequency Division Multiplexing (COFDM). Has a data rate.

Since the DMB dedicated content is generated by high compression encoding so that the terrestrial DMB service can be provided through the terrestrial DMB dedicated network, it is possible to provide terrestrial DMB services such as video even at a low data rate.

1 is a diagram illustrating a configuration of a general DMB broadcasting system.

As shown in FIG. 1, the DMB system includes a video encoder 11, an audio encoder 10, a data encoder 12, a main stream encoder, an ensemble multiplexer 20, an OFDM modulator 30, a transmitter 40, The repeater 50 and the receiver 60 is included.

Video encoder 11 provides a video service, audio encoder 10 provides an audio service, and data encoder 12 provides a data service.

The video encoder 11, the audio encoder 10, and the data encoder 12 are typically operated by a service provider.

The ensemble multiplexer 20 is typically operated by an ensemble provider, and generates an ETI signal by ensembling multiple video services, audio services, and data services from different networks.

The transmitter 40 is usually operated by a transmission network provider, and modulates and transmits the ETI signal provided by the ensemble multiplexer 20 in an OFDM scheme.

The repeater 50 may be selectively installed by the transmission network provider, and may be introduced to increase the strength of the transmission signal, that is, to improve the quality of the broadcast signal or to extend the medium delivery range, and to receive the signal from the transmitter 40 wirelessly or by wire. A ETI signal is amplified and output.

The DMB network having the above configuration has grown along with the development of related broadcasting equipment since the first trial broadcast in 2005.

In particular, low-power DMB broadcasting, which uses a small output to target a limited area within 5 ~ 10km, provided the opportunity for revitalization of local autonomy, regional community formation, local culture development and development, and social minorities.

For such a low power DMB broadcast, the terrestrial broadcaster should have all the system functions for operating the DMB broadcast.

However, such a system is not suitable for low-power DMB broadcasting, so if the same broadcasting system as the terrestrial broadcasting is constructed, there is a problem in that the overall system construction cost and maintenance cost are increased.

Republic of Korea Patent Registration No. 10-1083992

SUMMARY OF THE INVENTION The present invention has been made to solve the above-mentioned problems, and by implementing the ensemble multiplexer and the AVC encoder used in the low power DMB broadcasting integrally as hardware, simplifying and miniaturizing the low power DMB broadcasting, the transmission speed is improved and narrow. It is to provide a small output DMB broadcasting system that can be installed in a space and can reduce manufacturing and maintenance costs.

A low power DMB broadcasting system of the present invention for achieving the above object includes a video encoder unit for compressing and encoding video data using MPEG-4 AVC (H.264) technology, and audio data using MPEG-4 BSAC technology. An AVC encoder unit including an audio encoder unit for compressing and encoding the same; An ensemble multiplexer for multiplexing the compressed and encoded video data and audio data through the AVC encoder and generating and transmitting a digital stream; The AVC encoder section and the ensemble multiplexing section are integrally formed; The AVC encoder unit and the ensemble multiplexer integrated control unit is configured to include.

The AVC encoder includes: a TS multiplexer for receiving video data and audio data compressed and encoded through the video encoder and the audio encoder, and converting the video data into a single transport stream; The TS multiplexer may be connected to the TS multiplexer, and may include a first RS encoder and an interleaver for error correction of compressed coded video data and audio data changed into one transport stream through the TS multiplexer.

The ensemble multiplexer includes a service multiplexer for mapping and adding FICs to video data and audio data encoded through the AVC encoder; An ETI packetizer configured to be connected to the service multiplexer and convert compressed coded video data and audio data added with an FIC mapped through the service multiplexer into an ETI stream; A second RS encoder may be included in connection with the ETI packetization unit and include a second RS encoder for error correction of the ETI stream data output through the ETI packetization unit.

The AVC encoder unit and the ensemble multiplexer are connected in parallel, the video encoder and the audio encoder are connected to the TS multiplexer, the first RS encoder is connected to the TS multiplexer, and the interleaver part is 1 may be connected to the RS encoder, the service multiplexer is connected to the ETI packetizer, the second RS encoder may be connected to the ETI packetizer.

In the video encoder, an item for setting an AVC encoder unit includes an input type setting, a resolution setting, a video format setting, a frame rate setting, and an IDR period setting; The items for setting the audio encoder include encoder type setting, input type setting, sampling frequency setting, channel type setting, analog gain setting and subframe number setting; The items for setting the ensemble multiplexer include component management settings, ensemble management settings, service management settings, subchannel management settings, ETI management settings, FIC information generation function setting, I / O status monitoring and operation function setting, I / O subchannel connection function setting, service The editing function setting and the subchannel link information setting can be made.

According to the low power DMB broadcasting system of the present invention as described above, the ensemble multiplexer and the AVC encoder used for the low power DMB broadcasting are integrally implemented in hardware to simplify and reduce the size of the low power DMB broadcasting, thereby improving the transmission speed. It can be installed in a small space and has the effect of reducing manufacturing and maintenance costs.

1 is a block diagram showing a configuration diagram of a general DMB broadcasting system.
2 is a block diagram showing a low power DMB broadcasting system according to an embodiment of the present invention.
3 is a detailed block diagram illustrating a low power DMB broadcasting system according to an embodiment of the present invention.

DETAILED DESCRIPTION Hereinafter, exemplary embodiments of the present invention will be described in detail with reference to the accompanying drawings so that those skilled in the art may easily implement the present invention.

2 is a block diagram illustrating a low power DMB broadcasting system according to an embodiment of the present invention, and FIG. 3 is a detailed block diagram showing a low power DMB broadcasting system according to an embodiment of the present invention.

As shown in FIG. 2, the low power DMB broadcasting system according to an embodiment of the present invention includes an AVC encoder unit 100, an acoustic encoder unit 200, an ensemble multiplexer 300, and an integrated management unit 400. It is made to contain.

The AVC encoder unit 100 is for TV broadcasting. The video encoder 110 compresses and encodes video data using MPEG-4 AVC (H.264) technology, and the audio data using MPEG-4 BSAC technology. Audio encoder 120 for compression encoding.

The video encoder 110 is a module that receives an analog video signal (NTSC) and encodes it to MPEG-4 Advanced Video Coding (MPEG4-AVC) <H.264> to output a video element stream (ES). In this case, the video standard should conform to ISO / IEC 14496-10 (MPEG-4 Part 10 Advanced Video Coding).

The audio encoder 120 is a module that receives an analog audio signal (wave) and encodes it by bit sliced arithmetic coding (BSAC) and outputs an audio ES. Referring to the encoder module configuration, the audio standard is ISO / IEC 14496-3 -4 BSAC).

As shown in FIG. 3, the AVC encoder unit 100 further includes a TS multiplexer 130, a first RS encoder 140, and an interleaver 150.

The TS multiplexer 130 receives the compressed and encoded video data and audio data through the video encoder 110 and the audio encoder 120 and converts them into a single transport stream.

The first RS encoder 140 is provided for error correction, and RS (Reed Solomon 204, 188) converts compressed coded video data and audio data changed into one transport stream form through the TS multiplexer 130. Encode by standard.

The interleaver 150 is provided for error correction to perform convolutional interleaving. The interleaver 150 is connected to the first RS encoder 140 to improve error correction performance.

As shown in FIG. 2, the acoustic encoder unit 200 is for radio broadcasting such as FM or AM, and receives audio data and compresses and encodes the audio data using MPEG-2 Audio Layer II (MUSICAM) technology. Then output the stream.

The acoustic encoder 200 may compress and encode audio data using AAC (Advanced Audio Coding) capable of generating a high quality digital file.

As shown in FIG. 3, the ensemble multiplexer 300 includes a service multiplexer 310, an ETI packetizer 330, and a second RS encoder 350.

The service multiplexer 310 maps a fast information channel (FIC) including detailed information about a broadcast channel to video data and audio data output through the AVC encoder 100.

The service multiplexer 310 generates a time stamp for synchronizing and transmitting timing information of data input through the AVC encoder 100 and the sound encoder 200.

The ETI packetizer 330 converts FIC-mapped video data and audio data into an Ensemble Transport Interface (ETI) stream form through the service multiplexer 310.

The ETI packetizer 330 corresponds to an NI (Network Independent) layer in the hierarchical structure of the ETI, and includes a basic interface of ETI-related equipment.

The second RS encoder 350 functions to correct an error of the ETI stream data output through the EIT packetizer 330.

The second RS encoder 350 corresponds to an NA (Network Adaptation) layer in the hierarchical structure of the ETI, and the NA layer is an error-protected physical form to be used in an error-prone network environment compared to the NI layer. Interface layer.

On the other hand, the ensemble multiplexer 300 may be designed according to the criteria described later.

Arm Based Embedded is designed and handled by Linux Kernel Porting and can be configured with eight inputs (e.g., two video, two audio, four data).

Individual input and output line specifications can be made such that G.703 and G.704 are supported simultaneously.

The basic error check function of the input line may be supported, and two of the output channels may be configured to be ETI outputs.

Internal and external clock synchronization may be supported, and non-clocked or clock may be configured to insert a processing routine of another line.

DMB 2.0 User Application Type support can be made, and the function for AT-DMB compatibility can be made to be supported.

In addition, the AVC encoder 100 and the ensemble multiplexer 300 are connected in parallel.

The video encoder 110 and the audio encoder 120 are connected to the TS multiplexer 130, the first RS encoder 140 is connected to the TS multiplexer 130, and the interleaver part. 150 is connected to the first RS encoder 140.

The service multiplexer 310 is connected to the ETI packetizer 330, and the second RS encoder 350 is connected to the ETI packetizer 330.

As described above, the AVC encoder unit 100 and the ensemble multiplexer 300 can be implemented as a single integrated product in hardware so as to be connected, and the function can be simplified to suit a small output DMB system.

This miniaturization of low-power DMB systems can reduce manufacturing and maintenance costs compared to existing products.

In addition, since the system can be composed of one integrated product, the items to be set are significantly reduced, the production cost and maintenance cost are reduced due to the reduced number of parts, and it can be installed in a narrow space as one integrated product. .

The integrated management unit 400 is an integrated control of the AVC encoder unit 100 and the ensemble multiplexer 300, and the AVC encoder unit 100 and the ensemble multiplexer through a wired communication network or a wireless communication network such as Ethernet. The state and information of 300 may be changed.

The AVC encoder unit 100 is set through the integrated management unit 400. The video encoder 110 includes input type settings such as Composite, S video, and SDI, QCIF (Quarter Common Intermediate Format), and QVGA. Resolution settings such as Quicktime VGA and Common Intermediate Format, Video Format settings such as NTSC and PAL, Frame Rate settings such as 20, 25, and 30, 1x and 2x IDR period setting and the like.

The item for setting the audio encoder 120 through the integrated management unit 400 includes an encoder type setting such as BSA and HEAAC1, an input type setting such as AES / EBU and Analog, 2.4k, 44.1k and 48k, and the like. Sampling frequency setting, Channel type setting such as Mono and Stereo, Analog gain setting such as 0, 3, 6, 9 and 12, Sub like 1, 2, 3, 4 and 5 Num of Subframe setting.

The items for setting the ensemble multiplexer 300 through the integrated management unit 400 include component management settings, ensemble management settings, service management settings, subchannel management settings, ETI management settings, FIC information generation function settings, input / output status monitoring, and the like. Operation function setting, I / O subchannel connection function setting, service editing function setting, subchannel link information setting and so on.

As described above, when the low output DMB broadcasting system is implemented, the AVC encoder unit 100 encodes the produced video data to MPEG4-AVC (MPEG 4 Advanced Video Coding) <H.264> for TV broadcasting. Audio data is encoded by bit sliced arithmetic coding (BSAC).

Subsequently, the encoded video data and the audio data are in the form of TS (Transport Stream) through the TS multiplexer 130, and are respectively Reed Solomon through the first RS encoder 140 and the interleaver 150. After the encoding and the convolution interleaver are executed, they are transmitted to the ensemble multiplexer 300.

Subsequently, the service multiplexer 310 maps a fast information channel (FIC) to video data and audio data output through the AVC encoder 100.

Subsequently, the ETI packetizer 330 converts the FIC-mapped video data and audio data into an Ensemble Transport Interface (ETI) stream.

Subsequently, video data and audio data on which Reed Solomon encoding is performed through the second RS encoder 350 are modulated by the OFDM scheme through a transmitter (not shown) and transmitted to various DMB broadcast receivers. Delivered.

In the above description, the present invention has been described with reference to preferred embodiments, but the present invention is not necessarily limited thereto, and a person having ordinary skill in the art to which the present invention pertains does not depart from the technical spirit of the present invention. It will be readily appreciated that various substitutions, modifications and variations can be made.

100: AVC encoder section 110: video encoder section
120: audio encoder unit 300: ensemble multiplexer
400: integrated management

Claims (5)

And a video encoder unit 110 for compressing and encoding video data using MPEG-4 AVC (H.264) technology, and an audio encoder unit 120 for compressing and encoding audio data using MPEG-4 BSAC technology. An AVC encoder unit 100;
An ensemble multiplexer (300) for multiplexing the compressed and encoded video data and audio data through the AVC encoder unit (100) and generating and transmitting a digital stream;
The AVC encoder unit 100 and the ensemble multiplexing unit 300 are integrally formed;
The AVC encoder unit 100 and the ensemble multiplexer 300 includes an integrated management unit 400 for controlling the integration, the item setting the AVC encoder unit 100 through the integrated management unit 400 is a video encoder At 110, input type setting, resolution setting, video format setting, frame rate setting, and IDR period setting are made; An item for setting the audio encoder 120, the encoder type setting, input type setting, sampling frequency setting, channel type setting, analog gain setting, the number of sub-frames, characterized in that the low output DMB broadcasting system. The method of claim 1, wherein the AVC encoder unit 100
A TS multiplexer (130) for receiving the video data and the audio data compressed by the video encoder (110) and the audio encoder (120) and converting them into a single transport stream;
The first RS encoder 140 is connected to the TS multiplexer 130 and is used for error correction of compressed coded video data and audio data changed into one transport stream through the TS multiplexer 130. And an interleaver unit 150. The method of claim 2, wherein the ensemble multiplexer 300
A service multiplexing unit (310) for mapping and adding FIC to the compressed coded video data and audio data outputted through the AVC encoder unit (100);
An ETI packetizer 330 which is provided in connection with the service multiplexer 310 and converts the compressed coded video data and audio data added by FIC mapping through the service multiplexer 310 into an ETI stream form; ;
A second RS encoder 350 that is connected to the ETI packetizer 330 and is used for error correction of ETI stream data output through the ETI packetizer 330.
Low power DMB broadcasting system comprising a. The method of claim 3, wherein the AVC encoder unit 100 and the ensemble multiplexer 300 are connected in parallel, and the video encoder 110 and the audio encoder 120 are connected to the TS multiplexer 130. The first RS encoder 140 is connected to the TS multiplexer 130, and the interleaver 150 is connected to the first RS encoder 140, and the service multiplexer The 310 is made in connection with the ETI packetizer 330, the second RS encoder 350 is connected to the ETI packetizer 330 characterized in that the low power DMB broadcasting system. The method of claim 1, wherein the items for setting the ensemble multiplexer 300 include component management settings, ensemble management settings, service management settings, subchannel management settings, ETI management settings, FIC information generation function settings, input / output status monitoring and operation. A low output DMB broadcasting system comprising function setting, input / output subchannel connection function setting, service editing function setting and subchannel link information setting.

Images