KR20060065435A - Apparatus and method for receiving of digital signal broadcasting with built-in sub-channel decoder - Google Patents

Abstract

The present invention relates to a receiving apparatus for digital audio broadcasting (DAB) and digital multimedia broadcasting (DMB), and includes a subchannel decoder in the receiving apparatus to set subchannel configuration information from high-speed information channel (FIC) information. The present invention relates to a subchannel decoder capable of speeding up processing time and reducing the burden on the microprocessor, and a method for receiving digital multimedia broadcasting using the same.

The subchannel decoder according to the present invention receives fast information channel (FIC) information, counts and outputs fast information group (FIG) data, generates a flag signal, and detects the start position of the subchannel configuration information. An information detector; A subchannel configuration information decoder for storing the fast information group data in a predetermined order and outputting subchannel configuration information when the flag signal is generated, using the count value as a buffer reference address; And a subchannel setting unit configured to set the first constant and the second constant generated by using the output subchannel configuration information to a deinterleaver of the digital broadcast receiver.

Digital Audio Broadcasting (DAB), Digital Multimedia Broadcasting (DMB), Subchannel Decoder, Deinterleaver, Fast Information Channel (FIC) Information

Description

Subchannel decoder and method for receiving digital multimedia broadcasting using same {Apparatus and method for receiving of digital signal broadcasting with built-in sub-channel decoder}

1 is a block diagram schematically illustrating a digital broadcast receiving apparatus for receiving a conventional digital multimedia broadcasting.

2 is a diagram illustrating a structure of a data broadcast transmission frame to which the present invention is applied.

3 is a block diagram schematically showing a digital broadcast receiver to which the present invention is applied;

4 is a diagram illustrating a configuration of a subchannel decoder according to an embodiment of the present invention.

5 is a diagram illustrating a detailed configuration of a subchannel configuration information detector of a subchannel decoder according to an embodiment of the present invention.

6 is a diagram illustrating a detailed configuration of a subchannel configuration information decoder of a subchannel decoder according to an embodiment of the present invention.

7 is a diagram illustrating that data is sequentially stored in a buffer and a buffer controller in a subchannel configuration information decoder of components of a subchannel decoder according to an embodiment of the present invention.

8 is a diagram illustrating a detailed configuration of a subchannel setting unit of a subchannel decoder according to an embodiment of the present invention.

9 is a flowchart illustrating a digital multimedia broadcasting reception method using a subchannel decoder according to an embodiment of the present invention.

<Description of Symbols for Main Parts of Drawings>

      300: antenna 302: analog to digital converter

      304 digital front-end 306 conversion / demodulator

      308: time / frequency deinterleaver 310: Viterbi decoder

      312: MPEG audio decoder 314: subchannel decoder

      400: subchannel configuration information detector 402: subchannel configuration information decoder

      404: subchannel setting unit 500: FIG length counter

      502: FIG type detector 600: buffer mask

      602: Buffer and Buffer Controller 700: First Constant Calculator

      702: selector 704: first LUT

      706: Second LUT 708: Second Constant Calculator

The present invention relates to a subchannel decoder and a method for receiving digital audio broadcasting (DAB) or digital multimedia broadcasting (DMB) using the same.

Recently, as digital audio equipments with excellent sound quality such as CD and DVD have been rapidly spread and popularized, the demand of listeners for digital broadcasting requiring high quality sound is increasing day by day, and thus the limitation of sound quality that existing FM broadcast can provide To overcome this, digital audio broadcasting (DAB) is being implemented in Europe, Canada, and the United States.

Digital audio broadcasting system uses technology that is completely different from current AM broadcasting and FM broadcasting to show not only high quality sound but also excellent reception on the go, and it can transmit digital data such as video and text at high speed. Have. Recently, various multimedia services including video rather than audio broadcasting are emphasized and called digital multimedia broadcasting (DMB).

1 is a block diagram schematically illustrating a digital broadcast receiver for receiving a multimedia broadcast according to the related art. The antenna 100, an analog-to-digital converter (ADC) 102, and a digital front-end are shown in FIG. Front-end 104, converter / demodulator 106, deinterleaver 108, Viterbi decoder 110, audio / video decoder 112, and microprocessor 114.

The analog to digital converter 102 converts a signal received from the antenna 100 into a digital signal and outputs the digital signal to the digital front-end 104. The digital front-end 104 serves to tune the digital signal input from the analog-to-digital converter 102 and then output it to the converter / demodulator 106.

The converter / demodulator 106 receives the output signal of the digital front-end 104 and demodulates it through a fast Fourier transform (FFT) and differential demodulation process, and de-interleaves the demodulated signal. And outputs to (108).

The deinterleaver 108 receives the output signal of the converter / demodulator 106 to perform a deinterleaving process and then outputs the output signal to the Viterbi decoder 110. Viterbi decoding has the advantage of being easy to implement decoding hardware and having a fixed decoding time.

The Viterbi decoder 110 receives the output signal of the deinterleaver 108 and performs channel decoding, and then outputs the audio signal to the audio or video decoder 112. The audio or video decoder 112 receives an output signal of the Viterbi decoder 110 and restores the output signal to a PCM signal, and then outputs the output signal to the outside.

That is, to summarize the operation of the conventional digital broadcast receiver for receiving an audio or multimedia broadcast, first, the signal received from the antenna 100 is converted into a digital signal by the analog-to-digital converter 102 to the baseband I / Q Separated by signal. The demodulated signal is then subjected to fast Fourier transform (FFT) and differential demodulation in the transform / demodulator 106 and then decoded into an audio or video signal through an audio or video decoder 112 after channel decoding. Is restored.

Typically, Digital Audio Broadcasting (DAB) is transmitted based on the European standard Eureka-147 [ETSI EN 300 401], and the multiplexing and synchronization of programs is based on the MPEG-2 Moving Picture Experts Group Port stream (TS) [ISO / IEC 13818-1] is used.

In the Eureka-147, important information is transmitted through a fast information channel (FIC), which is standardized to transmit a program configuration and the like. The feature of the FIC is that time interleaving is not performed, so that necessary information can be obtained within a faster access time, and used to transmit structural data such as service information.

The microprocessor 114 is connected to the deinterleaver 108, the Viterbi decoder 110, and the audio or video decoder 112, and processes FIC data from the Viterbi decoder 110 to process the user. Sets the selected channel information to the deinterleaver 108 so that the user can select a desired broadcast.

However, in the conventional digital broadcast reception method for receiving an audio or multimedia broadcast, even when the microprocessor 114 does not need multiplexing information (MCI) and system information (SI), it is always necessary to select a broadcast channel. Since the process of receiving and decoding the FIC information is required, there is a problem in that it takes a long time to set the subchannel configuration information from the FIC information.

In addition, since the burden on the microprocessor 114 is increased, there is a problem that data transmission is not smoothly transmitted to the entire digital broadcasting receiver.

SUMMARY OF THE INVENTION An object of the present invention is to provide a subchannel decoder in addition to a microprocessor included in a digital audio broadcasting (DAB) or digital multimedia broadcasting (DMB) receiving apparatus to set subchannel configuration information from fast information channel (FIC) information. A subchannel decoder and a method for receiving a digital multimedia broadcast using the same which speeds up processing time and reduces the burden on the microprocessor.

According to one aspect of the present invention, a subchannel decoder is provided. In the sub-channel decoder included in the digital broadcasting receiver, the apparatus receives fast information channel (FIC) information, counts and outputs fast information group (FIG) data, and outputs a flag signal. A subchannel configuration information detector for detecting a start position of the subchannel configuration information; A subchannel configuration information decoder for storing the fast information group data in a predetermined order and outputting subchannel configuration information when the flag signal is generated, using the count value as a buffer reference address; And a subchannel setting unit configured to set a first constant and a second constant generated using the output subchannel configuration information in a deinterleaver of the digital broadcasting receiver.

The FIC information is characterized in that the information on modem operation. The flag is characterized in that the FIG 0/1 flag. The subchannel configuration information detection unit detects the FIG length byte from 0 and outputs the FIG counter value to the subchannel configuration information decoder, and detects the FIG header flag when the counter value is 0 or 1. And a FIG type detector for generating a flag signal. Sub CH ID, Start Address, Short / Long Form, Table Switch, Table Index, Option, Protection Level , In order of sub-channel size.

The sub-channel configuration information decoder includes: a buffer mask for receiving FIC data when the FIG 0/1 flag is generated from the sub-channel configuration information detection unit and transferring the FIG data byte using the FIG count value as a buffer reference address; And a buffer and a buffer controller for storing the received FIG data bytes and outputting the data in units of 8 bytes.

The subchannel setting unit receives a subchannel ID and a start address, generates a first constant, and outputs the first constant to a frequency deinterleaver provided in the receiver, a selector for outputting a second constant according to the short long form flag, and a table index. It characterized in that it comprises a first look up table (LUT) and a second LUT.

The selector is connected to the first LUT, the second constant calculator, and the second LUT to extract information from the first LUT using a table index when the short long form flag is zero, and if the short long form flag is 1. In the case of using the data option and channel size information read from the second LUT made from the protection level, characterized in that the second constant by the calculator to make a second constant and output to the deinterleaver.

In addition, there is provided a subchannel decoder and a digital multimedia broadcasting reception method using the same according to another aspect of the present invention. The method includes: receiving a broadcast signal of a sub-channel decoder provided in a receiver for receiving digital audio broadcast and digital multimedia broadcast; Determining whether fast information channel (FIC) information is present in the received signal; Setting subchannel configuration information in a deinterleaver provided in the digital broadcasting receiver, if the FIC information exists as a result of the determination; And outputting the transmitted signal. If it is determined that the FIC information does not exist, the method may further include decoding and outputting the information by a microprocessor.

Hereinafter, exemplary embodiments of the present invention will be described in detail with reference to the accompanying drawings. However, the following detailed description is provided for illustrative purposes only and should not be construed as limiting the inventive concept to any particular physical configuration.

2 is a diagram illustrating a structure of a data broadcast transport frame to which the present invention is applied. Referring to FIG. 2, the transport frame includes a synchronization channel 200, a fast information channel (FIC) 202, and a main service channel (MSC) 204. It consists of.

Here, the FIC 202 is composed of respective fast information blocks (FIBs), and the main service channel 204 is each of the interleaved frames (CIFs). And CIF). The smallest unit that can be assigned an address in the CIF is a space unit (CU), one CU is 64-bit. A plurality of CUs are connected to form one subchannel, and the main service channel 204 may be referred to as a multiplex structure of these subchannels.

In order to transmit the service component of the main service channel 204, two data transmission modes, a stream mode and a packet mode, are supported. The stream mode provides transparent transmission at a fixed bit rate using one subchannel designated from the information source to the destination.

In addition, the packet mode can deliver several data service components in one subchannel. Most data services other than system information (SI) use the main service channel (MSC). At this time, the number of FIBs and CIFs that enter each FIC and the main service channel (MSC) is determined according to the transmission mode.

3 is a block diagram schematically illustrating a digital broadcast receiving apparatus to which the present invention is applied. As shown in FIG. 3, the digital broadcast receiver includes an antenna 300, an analog-to-digital converter (ADC) 302, a digital front-end 304, The converter / demodulator 306, the deinterleaver 308, the Viterbi Decoder 310, the MPEG audio decoder 312, and the subchannel decoder 314 are included.

The digital broadcast signal is transmitted from the antenna 300, the analog-to-digital converter (ADC) 302, the digital front-end 304, the converter / demodulator 306, the deinterleaver. 308, detailed operation of the Viterbi decoder 310 is omitted because it is similar or identical to the known prior art.

The subchannel decoder 314 is connected to the deinterleaver 308 and the Viterbi decoder 310 to connect the antenna 300, an analog-to-digital converter (ADC) 302, and a digital front-end. Only the FIC information is detected / processed from the broadcast signal passed through the digital front-end 304, the converter / demodulator 306, the deinterleaver 308, and the Viterbi decoder 310 (see the drawings below for details). After that, the channel information selected by the user is set in the deinterleaver 308 so that the user can watch the desired broadcast.

The FIC information may be divided into FIC information provided to a user and FIC information provided to a user. In the present invention, the microprocessor 316 does not process the FIC information corresponding to the modem operation information, and the subchannel decoder 314 processes. The microprocessor 316 processes information other than the FIC information.

4 is a diagram illustrating a configuration of a subchannel decoder according to an embodiment of the present invention. Referring to FIG. 4, the subchannel decoder 314 includes a subchannel configuration information detector 400, a subchannel configuration information decoder 402, and a subchannel setting unit 404.

When the operation of the subchannel decoder 314 is described, the subchannel configuration information detector 400 counts FIG data from the FIC information received from the Viterbi decoder 310 and the subchannel configuration information decoder 402. On the other hand, the FIG 0/1 type (type 0 field for extension 1) data of the FIG type is detected and output to the subchannel configuration information decoder 402. Here, the FIG 0/1 type data represents an identifier and related information for a subchannel through which data is transmitted in a subchannel structure.

That is, the subchannel configuration information detection unit 400 counts FIG data bytes from 0 and outputs the counter value, and detects the FIG header flag when the counter values are 0 and 1 (indicated by the type positions 0 and 1). The start position of the subchannel configuration information is detected by generating a flag signal.

When the flag signal is generated, the subchannel decoder 402 receives the FIC data, stores the FIG data in a predetermined order using the received FIG count value as a buffer reference address, and outputs subchannel configuration information. Here, the subchannel configuration information includes channel ID, start address, channel size information, and the like.

The subchannel setting unit 404 receives the output subchannel configuration information, creates a first constant and a second constant, and outputs the constant to the deinterleaver 308 to set channel information. Here, the first constant is a value calculated from a sub channel ID and a start address of the sub channel configuration information, and the second constant is a table index, a sub channel CU size, an option, and a protection. Value calculated from Protection Level and Short Form.

5 is a diagram illustrating a detailed configuration of a subchannel configuration information detector of a subchannel decoder according to an embodiment of the present invention. Referring to FIG. 5, the subchannel configuration information detection unit 400 includes a FIG length counter 500 and a FIG type detector 502.

Typically, the FIC information data is composed of 32 bytes. The FIC information data is composed of a 30-byte Fast Information Block (FIB) data field and two-byte cyclic redundancy checking (CRC) for error checking and detection. have. The FIB data field is composed of FIG (Fast Information Groups), and the FIG is composed of a FIG header and an FIG data field.

The FIG type of FIG data is four types, such as FIG0, FIG1, FIG5, and FIG6, and the number of extended bits according to the FIG type is 5 bits, 3 bits, 3 bits, 6 bits. That is, the type of FIG is determined according to the FIG type and the expansion value. FIG 0 is classified into 0-31, FIG 1 is 0-7, FIG 5 is 0-7, and FIG 6 is 0-63.

The data constituting the FIG header includes the FIG type information in the upper bits and the FIG length information in the lower bits. In addition, the FIG data field has data equal to the length of FIG. The FIG length counter 500 counts the FIG data bytes from 0 and outputs the FIG counter value to the subchannel configuration information decoder 402. When the counter value is 0 or 1 (when the counter point indicates the type positions 0 and 1), the FIG header flag is generated so that the FIG type detector 502 can detect the FIG type.

In other words, the FIG type detector 502 receives the FIG header byte when the FIG header flag is generated, and compares the upper 3 bit values of the FIG header with the '000' value, which is a bit value for FIG type 0, and then FIG. When the flag is generated, the lower five bits of the FIC data are compared with the decimal one, and if the values are the same, the FIG 0/1 (type 0 field for extension 1) flag is output to the subchannel configuration information decoder 402.

6 is a diagram illustrating a detailed configuration of a subchannel configuration information decoder of a subchannel decoder according to an embodiment of the present invention. Referring to FIG. 6, the subchannel configuration information decoder 402 includes a buffer mask 600, a buffer, and a buffer controller 602.

The buffer mask 600 receives the FIC data byte when the FIG 0/1 flag input from the subchannel configuration information detection unit 400 occurs, buffers FIG data in a predetermined order using the FIG count value as the buffer reference address. Stored in the buffer controller 602.

Typically, the buffer and the buffer controller 602 having 32 buffers receive data from the buffer mask 600, store the data in the address buffer of the FIG counter value, and output the data to the subchannel setting unit 404 in units of 8 bytes.

7 is a diagram illustrating that data is sequentially stored in a buffer and a buffer controller in a subchannel configuration information decoder of components of a subchannel decoder according to an embodiment of the present invention.

Referring to FIG. 7, in the buffer and buffer controller 602 in the subchannel configuration information decoder 402, the subchannel configuration information includes a subchannel ID 700 and a start address. 702, Short / Long Form 704, Table Switch 706, Table Index 708, Option 710, Protection Level ( 712, and then in the order of Sub CH CU Size 714.

The actual incoming information bits of each data are 6 bits for the Sub CH ID 700, 10 bits for the Start Address 702, and 1 for the Short / Long Form 704. Bit, Table Switch 706 is 1 bit, Table Index 708 is 6 bits, Option 710 is 3 bits, Protection Level 712 is The 2-bit, sub-channel CU size 714 is 10 bits.

8 is a diagram illustrating a detailed configuration of a subchannel setting unit of a subchannel decoder according to an embodiment of the present invention. Referring to FIG. 8, the subchannel setting unit 404 may include a first constant calculator 800, a selector 802, a first look up table (LUT) 804, a second LUT 806, and a second constant. A calculator 808.

The subchannel setting unit 404 receives the subchannel ID 700 and the start address 702 from the subchannel configuration information decoder 402 included in the subchannel decoder 304, and then receives the first constant calculator 800. After the first constant is made from the output to the deinterleaver 308 provided in the receiver 300.

On the other hand, the selector 802 for outputting the second constant is connected to the first LUT 804, the second constant calculator 804, and the second LUT 806, and the short long form flag (direct) directly entering the selector 802 ( Short / Long Form flag) works differently.

That is, when the short form flag is 0 (short form), information is extracted from the first look up table (LUT) 804 generated from the table index 708, the first constant is made, and then the digital broadcast receiver is extracted. Output to the provided deinterleaver 308. However, if the short form flag is 1 (long form), the second option is performed by using the data option 710 and the subchannel CU size 714 information read from the second LUT 806 generated from the protection level 712. The constant calculator 808 generates a second constant and outputs the second constant to the deinterleaver 308 provided in the digital broadcasting receiver. When the first constant and the second constant are input to the deinterleaver 308, the subchannel is automatically set.

9 is a flowchart illustrating a digital multimedia broadcasting reception method using a subchannel decoder according to an embodiment of the present invention. 9 will be described with reference to FIG. 3, which shows the structure of a digital broadcast receiver according to an embodiment of the present invention. When the broadcast signal is received by the digital broadcast receiver (S900), the deinterleaver 308, the subchannel decoder 304 connected to the Viterbi decoder 310 and the microprocessor 306 from the Viterbit decoder 310 It is determined whether FIC information exists in the received information (S902).

As a result of the determination, if the received information includes FIC information, the subchannel decoder 304 counts FIG data and FIG 0/1 type data from the FIC information received from the Viterbi decoder 310, After storing FIG data in a predetermined order using the FIG count value as the buffer reference address, subchannel configuration information is set in the deinterleaver 308 provided in the digital broadcasting receiver to receive broadcast data desired by the user. (S904). On the other hand, if there is no FIC information in the information received from the Viterbi decoder 310, the microprocessor 316 processes the received information similarly to the conventional method (S906).

After performing the step S904 or the step S906, the audio or video decoder 312 of the digital broadcast receiver decodes the corresponding signal and outputs the signal to the outside (S908).

The present invention has been described above with reference to preferred embodiments thereof, which are merely examples and are not intended to limit the present invention, and those skilled in the art do not depart from the essential characteristics of the present invention. It will be appreciated that various modifications and applications which are not illustrated above in the scope are possible.

For example, each component specifically shown in the embodiment of the present invention can be modified. And differences relating to such modifications and applications will have to be construed as being included in the scope of the invention defined in the appended claims.

The present invention includes a subchannel decoder in addition to the microprocessor included in the digital audio broadcasting (DAB) and digital multimedia broadcasting (DMB) receiving apparatus, and the processing time from setting the fast information channel (FIC) information to the subchannel configuration information. To speed up.

In addition, the present invention reduces the burden on the microprocessor, enabling a more smooth data transmission to the entire digital broadcast receiving system.

Claims (11)

A subchannel decoder provided in a digital broadcasting receiver, Subchannel configuration information for receiving fast information channel (FIC) information, counting and outputting fast information group (FIG) data, and generating a flag signal to detect the start position of the subchannel configuration information. Detection unit; A subchannel configuration information decoder for storing the fast information group data in a predetermined order and outputting subchannel configuration information when the flag signal is generated, using the count value as a buffer reference address; A subchannel setting unit configured to set a first constant and a second constant generated by using the output subchannel configuration information in a deinterleaver of the digital broadcasting receiver; Subchannel decoder comprising a. The method of claim 1, And the FIC information is information on modem operation. The method of claim 1, And wherein the flag is a FIG 0/1 flag. The method of claim 1, The subchannel configuration information detector, FIG length counter which counts FIG data bytes from 0 and outputs the FIG counter value to the sub-channel configuration information decoder. FIG. And a subchannel decoder comprising: The method of claim 1, The predetermined order is Sub CH ID, Start Address, Short / Long Form, Table Switch, Table Index, Option, Protection Level And subchannel size (Sub CH Size). The method of claim 1, The subchannel configuration information decoder, When FIG 0/1 flag is generated from the sub-channel configuration information detector, a buffer mask for receiving FIC data and transmitting the FIG data byte with the FIG count value as a buffer reference address, and storing the received FIG data byte A subchannel decoder comprising a buffer and a buffer controller for outputting in byte units. The method of claim 1, The subchannel setting unit, A first constant calculator that receives the subchannel ID and the start address and makes a first constant, and outputs the first constant to a deinterleaver provided in the receiver; a selector for outputting a second constant according to the shortlong form flag; And a second LUT. The method of claim 7, wherein The selector is connected to the first LUT, the second constant calculator, and the second LUT to extract information from the first LUT using a table index when the short long form flag is zero, and if the short long form flag is 1. The subchannel decoder of claim 2, wherein the second constant is generated by the second constant calculator using the data option and channel size information read from the second LUT, and output to the deinterleaver. In the broadcast signal reception method of a sub-channel decoder provided in the digital broadcast receiver, Receiving the broadcast signal; Determining whether fast information channel (FIC) information is present in the received signal; Setting subchannel configuration information in a deinterleaver provided in the digital broadcasting receiver, if the FIC information exists as a result of the determination; Outputting the transmitted signal; Digital multimedia broadcasting receiving method using a sub-channel decoder comprising a. The method of claim 9, And if it is determined that the FIC information is not present, decoding and outputting the information by a microprocessor for information processing. The method of claim 9, And the FIC information is information on modem operation.

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