WO2014148851A1

WO2014148851A1 - Digital audio transmission system and digital audio receiver provided with united speech and audio decoder

Info

Publication number: WO2014148851A1
Application number: PCT/KR2014/002368
Authority: WO
Inventors: 김태호; 홍석진; 권기원; 박경원; 김성준; 이태진; 강경옥; 임보미; 이용태
Original assignee: 전자부품연구원; 한국전자통신연구원
Priority date: 2013-03-21
Filing date: 2014-03-20
Publication date: 2014-09-25

Abstract

The present invention relates to a digital audio transmission system and a digital audio receiver provided with a united speech and audio decoder. A digital audio transmission system according to the present invention is characterized by including: a sound source decoder for performing optimized sound source coding by changing the coding method through shifting between core codecs using a different coding method according to whether the input sound source is a speech signal or an audio signal and according to the detailed characteristics; a framing means for detecting the specific data of the coding from the stream data received from the sound source coder so as to produce a transmission frame containing the header and the protection code of the header; a transmission error coding means for processing the transmission frame including the transmission error coding; and a transmission data generation means for dividing at least one transmission frame accomplished with the transmission error coding into a given number of logical DAB frames, while a digital audio receiver provided with a united speech and audio decoder according to the present invention is characterized by including: a channel decoder for channel-decoding an audio broadcast signal transmitted as a logical DAB frame coded by a plurality of modes according to the characteristics of a sound source through different coding methods for the characteristic audio and speech signals; a first external decoding means for decoding respectively N logical DAB frames so as to recover the respective number of transmission frames and for performing a procedure including the transmission error decoding for each of the transmission frames so as to recover the respective number of sound source frames; and a united speech and audio decoder for decoding each sound source frame by the decoding method corresponding to the coding method detected for each sound source frame.

Description

Digital audio receiver with digital audio transmission system and integrated sound decoder

The present invention relates to a digital audio receiver having a digital audio transmission system and an integrated sound source decoder, and more particularly, an optimized sound source coding method is performed by changing a coding method in real time according to the characteristics of the sound source. A digital audio transmission system capable of providing high quality service to both voice and music by receiving a signal divided into logical DAB frames and performing decoding corresponding to the coding method of each sound source frame, and having a digital integrated audio decoder. It is for an audio receiver.

In the conventional digital audio service, a speech encoding technique based on a human speech generation model and each audio encoding technique based on a human auditory model have made independent developments in different service areas.

For example, in the speech coding technology, technology has been developed around voice communication, and AMR-WB + has recently been proposed. However, as shown in FIG. 1, AMR-WB + is capable of providing a high quality service for a sound source corresponding to a human voice, but has a tendency to be low for an audio signal outside this area.

On the other hand, HE-AAC v2 technology has been proposed for audio coding technology based on human auditory model following MPEG-1 Layer ∥ which is used to provide digital music broadcasting, but HE-AAC v2 provides high quality service for music signals. However, the quality of service tends to be lowered in the voice domain.

In recent years, as the audio service is progressing toward the integration of the existing voice communication and music broadcasting, a converged audio coding method capable of providing excellent quality service for both the voice domain and the general audio signal has been proposed.

An object of the present invention is to change the coding method in real time according to the characteristics of the sound source for the input sound source, and to perform an optimized sound source coding, thereby transmitting digital audio transmission capable of providing excellent quality for both voice and audio. To implement the system.

Another object of the present invention is to change the coding method according to the characteristics of the input sound source, and to perform transmission by performing optimized sound source coding, thereby providing strong quality for both voice and audio while providing strong protection from transmission errors of data frames. It is to implement a digital audio transmission system.

An object of the present invention is to change the coding method in real time according to the characteristics of the sound source with respect to the input sound source, and to perform the optimized sound coding, divided into logical DAB frames to receive the transmitted signal and coding method of each sound source frame The present invention provides a digital audio receiver having an integrated sound source decoder capable of providing high quality service to both voice and music by performing decoding corresponding to.

Another object of the present invention, by performing a sound source decoding corresponding to the coding method according to the music characteristics of each sound source frame, to provide a high quality for both voice and music, while having a strong recovery function for the data transmission error To implement a digital audio receiver having an integrated sound source decoder capable of providing a service.

The digital audio transmission system according to the present invention for achieving the above object is a transition between the core codecs by different coding schemes according to whether the input sound source is a voice or an audio signal and the detailed characteristics of the sound source. A sound source coder for changing and performing optimized sound source coding; Framed means for receiving stream data coded and input from the sound source coder, detecting specific data for coding, and generating and outputting a transmission frame including a header and a protection code of the header; Transmission error coding means for performing a procedure including transmission error coding on the transmission frame formed by the framing means; And transmission data generating means for dividing and generating at least one transmission frame in which the transmission error coding is completed into a predetermined number of logical DAB frames.

The digital audio transmission system according to the present invention for achieving the above object is a transition between the core codecs by different coding schemes according to whether the input sound source is a voice or an audio signal and the detailed characteristics of the sound source. A sound source coder for changing and performing optimized sound source coding; Framed means for receiving the stream data coded and input from the sound source coder, detecting specific data for coding to generate a header, and generating and outputting a transmission frame including the header protection code; Transmission error coding means for performing a procedure including transmission error coding on the transmission frame formed by the framing means; Transmission data generating means for dividing and generating at least one transmission frame having the transmission error coding into a predetermined number of logical DAB frames; And multiplexing means for receiving the output of the transmission data generating means and multiplexing and outputting the data including signaling data and service information data corresponding thereto.

The transmission error coding performed by the transmission error coding means is characterized by generating an error correction code by turbo code.

The transmission error coding means may further perform a vertical data interleaving process before or after the transmission error coding.

The multiplexing means may further include multiplexing at least one of the same service type transmission data, DAB transmission data, DAB + transmission data, and data broadcasting data.

The signaling data has the same configuration as the signaling data of the DAB transmission system, and a value of an audio service component type is assigned differently.

The logical DAB frame is characterized in that it further comprises an error correction code for each.

The protection code of the header is characterized in that the LDPC code.

A digital audio receiver having an integrated sound source decoder according to the present invention for achieving the above object, is coded by a plurality of modes according to the sound source characteristics and transmitted in a logical DAB frame according to the sound source characteristics differently A channel decoder configured to output a logical DAB frame by performing channel decoding on the audio broadcast signal; Receiving each of the N logical DAB frames of the output of the channel decoder, and reconstructing the number of transmission frames corresponding to each, and performing a process including decoding of the transmission error for each of the transmission frame, each of the corresponding number of sound sources First external decoding means for reconstructing the frame; And an integrated sound source decoder which detects a coding method for the sound source frame for each sound source frame and decodes each sound source frame by a decoding method corresponding to the detected coding method.

A digital audio receiver having an integrated sound source decoder according to the present invention for achieving the above object, is coded by a plurality of modes according to the sound source characteristics and transmitted in a logical DAB frame according to the sound source characteristics differently A channel decoder configured to output a logical DAB frame by performing channel decoding on the audio broadcast signal; A DAB decoding unit which receives a logical DAB frame output corresponding to a DAB service type from the channel decoder and decodes the sound source according to the header information of the logical DAB frame; Receiving each of the N logical DAB frames of the output of the channel decoder, and reconstructing the number of transmission frames corresponding to each, and performing a process including decoding of the transmission error for each of the transmission frame, each of the corresponding number of sound sources First external decoding means for reconstructing the frame; And an integrated sound source decoder which detects a coding method for the sound source frame for each sound source frame and decodes each sound source frame by a decoding method corresponding to the detected coding method.

A digital audio receiver having an integrated sound source decoder according to the present invention for achieving the above object, is coded by a plurality of modes according to the sound source characteristics and transmitted in a logical DAB frame according to the sound source characteristics differently A channel decoder configured to output a logical DAB frame by performing channel decoding on the audio broadcast signal; A DAB decoding unit which receives a logical DAB frame output corresponding to a DAB service type from the channel decoder and decodes the sound source according to the header information of the logical DAB frame; Receiving the N logical DAB frames of the output of the channel decoder, restoring a corresponding number of transmission frames, and performing a process including decoding of transmission errors for each of the restored transport frames, respectively. First external decoding means for reconstructing the sound source frame; Second external decoding means for receiving logical DAB frames corresponding to a DAB + service type from the channel decoder, restoring an original DAB + transmission frame, and performing RS decoding and data deinterleaving on the DAB + transmission frame to restore a DAB sound source frame and; If the sound source frame received from the first external decoding means or the second external decoding means is a DAB + sound source frame, the corresponding method is decoded. If the sound source frame is an output of the first external decoder, And an integrated sound source decoder which detects a coding method and decodes each sound source frame by a decoding method corresponding to the detected coding method.

And means for performing a vertical data deinterleaving process before or after transmission error decoding performed by the first external decoding means.

The transmission error decoding performed by the first external decoding means is LDPC decoding.

The transmission error decoding performed by the first external decoding means further includes means for performing error detection by a CRC code before or after LDPC decoding.

An error correction or error detection process may be performed on a logical DAB frame input to the first external decoding means in units of logical DAB frames.

The integrated sound source decoder includes an FD decoder for performing decoding on a music characteristic signal, and the FD decoder includes a component for decoding a specific bitstream decoded by HE-AACv2 of DAB +. It features.

According to the above configuration, the input method changes the coding method in real time according to the characteristics of the sound source and performs an optimized sound source coding to generate and transmit a transmission frame, thereby making it excellent for both voice and music. It becomes possible to provide quality.

In particular, by turbo code coding of a transmission frame, header information necessary for decoding a sound source is complicated, and powerful error correction function can be given to audio transmission data having a relatively small amount of transmission data. It becomes possible to provide.

The digital audio receiver having an integrated sound source decoder according to the present invention changes the coding method for an input sound source according to the characteristics of the sound source, and performs an audio signal serviced by a digital audio transmission system that performs an optimized sound source coding and transmits the audio signal. Receiving and decoding according to the coding method of the received sound source frame enables high quality audio service for both music or voice signals.

In addition, due to turbo code coding / decoding of a transmission frame for transmission error coding, a powerful error correction function can be given to audio transmission data having a complicated header information and a relatively small amount of transmission data. It is possible to provide a quality audio service.

In particular, with the recent development of integrated circuit technology, a chipset of an audio receiver can realize a high processing speed, and a processing speed for a signal having a small amount of data such as an audio signal is very fast. Therefore, according to the present invention, by applying a turbo code having a relatively large amount of transmission data, which is difficult to be applied in a video transmission / reception system, to transmission error coding of an audio frame, audio data transmission / reception such as USAC applying a highly compressed low bit rate coding method having a high risk of data loss. It is possible to provide high quality audio service with advanced error correction function.

1 is a diagram comparing audio quality of service provision for sound source frames coded by conventional AMR-WB + and HE-AACv2 coding methods.

2 is a schematic diagram illustrating a digital audio transmission system according to an embodiment of the present invention.

Fig. 3 is a schematic diagram illustrating main parts of a digital audio coder applicable in the digital audio transmission system of the embodiment of the present invention.

4 is a schematic diagram illustrating a configuration of a transmission frame in an embodiment of the present invention.

5 is a schematic diagram illustrating a code generator used for transmission error coding in a digital audio transmission system according to an embodiment of the present invention.

FIG. 6 is a diagram illustrating output data of a code generator used for transmission error coding of FIG. 5; FIG.

7 is a schematic diagram illustrating a structure of signaling data in a digital audio transmission system according to an embodiment of the present invention.

8 is a table comparing audio quality of service by a digital audio transmission system according to an embodiment of the present invention.

9 is a schematic diagram illustrating a configuration of a multiplexer of a digital audio transmission system according to an embodiment of the present invention.

10 is a schematic diagram of a DAB transmission frame for transmitting a transmission frame of a digital audio transmission system according to an embodiment of the present invention.

Fig. 11 is a schematic diagram illustrating a configuration of a digital audio receiver having an integrated sound source decoder of the first embodiment of the present invention.

12 is a schematic diagram illustrating a decoder applicable to a digital audio receiver having an integrated sound source decoder of a first embodiment of the present invention.

Fig. 13 is a schematic diagram illustrating a configuration of a digital audio receiver having an integrated sound source decoder of a second embodiment of the present invention.

Fig. 14 is a schematic diagram illustrating the configuration of a digital audio receiver with an integrated sound source decoder in a third embodiment of the present invention.

Hereinafter, a configuration of a preferred embodiment of a digital audio transmission system and a digital audio receiver according to an embodiment of the present invention having the above configuration will be described in detail with reference to the accompanying drawings.

Hereinafter, a configuration of a preferred embodiment of a digital audio receiver according to an embodiment of the present invention having the above configuration will be described in detail with reference to the accompanying drawings.

In FIG. 2, the digital audio transmission system 100 according to an embodiment of the present invention transitions between core codecs using different coding schemes according to characteristics of the sound source, changes coding methods, and optimizes sound source coding. A framer means 120 for performing a sound source coder 110, output data of the sound source coder 110 (for example, a sound frame or an AU: ACCESS UNIT), and converting the frame into a transmission frame having a predetermined structure; Transmission error coding means 130 for performing a procedure including transmission error coding on the transmission frame formed by the means 120, and generating one or two or more of the transmission frames into one or two logical DAB frames Receives the output of the transmission data generating means 150 and the transmission data generating means 150 and outputs the signaling data and service information corresponding thereto. It includes a modulator 300 for modulation to multiplexing means 200, and the multiplexed signal multiplexed by the output with the data containing the emitter.

The sound source coder 110 of the embodiment of the present invention may include an encoder based on USAC (United Speech and Audio Coding) proposed by the latest audio technology.

For example, the USAC audio coder shown in FIG. 3 is a codec that properly combines the advantages of HE-AAC V2 and AMR-WB +, and operates by selecting an appropriate core codec according to characteristics of an input signal. Transition and perform encoding.

That is, USAC largely adopts a different coding method for the music characteristic signal and the audio characteristic signal, and even in each coding method, the lower coding method is changed according to the characteristics of the sound source itself, and coding can be performed.

For example, USAC uses AAC (Advanced Audio Coding), a technology for encoding audio characteristic signals, and AAC technology used in USAC improves performance by changing the Huffman lossless coding tool of AAC to arithmetic coding. In addition, the high frequency band can be encoded using SBR, and in the case of a stereo signal can be encoded using the MPEG-Surround technology. USAC, on the other hand, uses ACELP and TCX of AMR-WB +, a 3GPP speech encoding technique, for encoding speech characteristic signals.

The sound source coder of this embodiment includes a signal classifier for classifying an audio characteristic signal and a speech characteristic signal, and has a window transition tool for processing transitions between respective encoding tools.

For example, the signal classification unit receives a sound source signal and analyzes the sound source signal to generate control information for triggering the selection of different coding modes, and the analysis of the sound source signal is dependent on the implemented system. Find the optimal core coding mode. In addition, the output of the signal classification means can be implemented to influence the operation of other tools, for example MPEG Surround, enhanced SBR, time-warped filterbank.

For example, the signal classification means determines a coding mode for each sound source frame composed of 1024 input samples. First, a series of parametric feature points are extracted from the input signal, and then the coding mode is determined.

For example, USAC's core codec is a mode tool for coding audio characteristic signals, which is implemented by improving the existing MPEG-4 AAC, and a mode tool for performing audio characteristic signal coding, by improving the LPC of the existing AMR-WB +. It is divided into the implemented LPD, and it is possible to determine whether to use FD or LPD primarily by signal classification means, and ACELP and TCX can be determined by extracting parameters of both time domain and frequency domain, respectively. .

The sound source coder 110 according to the present embodiment transitions between a plurality of encoding tools in accordance with a control signal generated by the signal classification means and performs coding in an optimal coding mode, so that data including information on the information is generated by coding. Coding information may be added to each sound frame.

The framer 120 of the embodiment of the present invention receives a sound source frame (AU: Access Unit) of a 16Kbps bitstream, for example, a bit rate of the output of the sound source coder 110, and adapts to a DAB transmission system (Fig. 10). Configure a possible transmission frame. For example, the size of the sound source frame, which is the output of the sound source coder, is shown in Table 1 below. When determined as described above, one transmission frame may be configured to include K sound source frames, and K sound source frames may constitute a plurality of transmission frames according to an embodiment.

Table 1

Index	coreCoder- FrameLength	sbrRatio (sbrRatioIndex)	output- FrameLength	Mps212 numSlots
0	768	no SBR (0)	768	NA
One	1024	no SBR (0)	1024	NA
2	768	8: 3 (2)	2048	32
3	1024	2: 1 (3)	2048	32
5	1024	4: 1 (1)	4096	64
5 ... 7	reserved

In addition, as shown in FIG. 4, when one transmission frame is constituted by K sound source frames, the transmission frame is again transmitted by the transmission data generating means 150 to N through the existing DAB transmission system. It can be divided into logical DAB frames and transmitted.

For example, assuming that the sampling rate of the sound source coder 110 output is S KHz and the size of the output frame is set to X, each sound source frame is (X / S) ms, and the DAB frame is 24 ms in the time domain, so N = ( X / S) * K / 24 logical DAB frames can be divided and transmitted by the DAB transmission system.

In an embodiment of the present invention, for example, the first frame of N logical DAB frames for transmitting a transport frame may include header information of the transport frame, and error coding such as LDPC coding or CRC coding or two for protecting the header information. All branches may be performed and additional data may be added, and each logical DAB frame may include information for syncing.

As a result, the decoding means of the receiving end reconstructs the transmission frame from the N logical DAB frames, and for example, extracts the header information to perform decoding on the transmission frames. In this case, error detection and error correction may be performed at the receiving end by decoding the header information of each transport frame, for example, an LDPC code and / or a CRC code.

In this case, in the error coding of the transport frame header, the ratio of the output data to the input data may be an optional matter according to the service policy, and according to an embodiment, it may be changed according to the region and the geographical feature of the broadcast. It may also be configured to. In this regard, information related to transport frame header error coding may be included in the signaling data so that the data can be transmitted through the FIC channel of the DAB frame (FIG. 10).

The transmission error coding means 130 of this embodiment performs bit-wise error coding on all the byte data constituting the transmission frame. The error coding method of this embodiment is an error of generating an LDPC code by the code generating means of FIG. The coding method may be used, and vertical data interleaving may be performed before and after transmission error coding.

In the embodiment of the present invention, as shown in FIGS. 5 and 6, turbo code generating means for generating coded output data at a predetermined ratio with respect to the input data may be used. That is, the amount of coded data generated according to the ratio 1/2, 1/4, 3/4, etc. of the output data to the input data of the turbo code generating means may vary.

For example, the ratio of the coded output data to the input data may be optional according to the service policy, and may be changed according to the region and the geographical feature in which the broadcast is transmitted. ) May be included in the signaling data transmitted through the FIC channel.

Digital audio broadcasting has a small amount of data for digital video broadcasting. In particular, the USAC-based digital audio transmission system transmits highly compressed data, while the header information is more complicated than the conventional DAB / DAB + digital audio transmission system. Loss, especially the loss of header information, can greatly affect broadcast quality. Accordingly, in the embodiment of the present invention, while powerful error coding is performed on the transport frame header, strong transmission error coding may be performed on the payload data by the LDPC code.

In other words, LDPC codes have a powerful error correction function instead of amplifying the data volume. Therefore, they are easy to apply to digital audio broadcasting, which has a small data volume and transmits highly compressed data, unlike digital video broadcasting. Can be prevented in advance.

The transmission data generating means 150 of the embodiment of the present invention divides the transmission frame in which the transmission error coding is completed by the transmission error coding means 130 into 24 ms units, which is the transmission time of the logical DAB frame of the MPEG Layer II. Creates a DAB frame. In addition, an error correction code and an error detection code may be separately assigned to data of a logical DAB frame according to an embodiment of the present invention.

The transmission frame according to the embodiment of the present invention is divided into N logical DAB frames and transmitted, and data of various other broadcast services (for example, one or more other USAC broadcast service data, one or two) before transmission modulation by the modulator 300 is transmitted. Two or more DAB or DAB + broadcasting service data, data broadcasting service data, etc.) and FIC / SI data for the broadcasting service data and the like, and are multiplexed by the multiplexer 200 to form a DAB transmission frame (FIG. 10) and modulator 300. ) Can be entered.

In this case, for the broadcast service of the embodiment of the present invention transmitted in a logical DAB frame, the audio component type (ASCTy: Audio Service Component Type) of the signaling data transmitted on the FIC channel of the DAB transport frame (FIG. 10) is separately. Can be specified. That is, as shown in FIG. 7, the FIC channel of the DAB transport frame is shown in FIG. 7 of the DAB standard (ETSI EN 300 401 V1.4.1 (2006-06)). The structure of the service organization field (24) includes signaling data for an audio service component type (ASCTy).

For any service k transmitted in the DAB transport frame (FIG. 10), for example, the k-th service component description may specify a 6-bit audio service component type of b _13- b ₈ for TMid = 00 (MSC stream audio). The pre-specified items are as follows.

000000: foreground sound (MPEG I or II (Layer IIor reserved) coding)

0000001: backgroung sound (MPEG I or II (Layer IIor reserved) coding)

000010: multi-channel audio extension (MPEG Ⅰ or Ⅱ

(Layer IIor reserved) coding)

111111: HE AAC v ₂

Signaling data for a logical DAB frame for transmitting a transport frame of the present embodiment may use an unspecified value. For example, 011111 corresponding to USAC may be used as an audio service component type designation value.

The digital audio receiver 500 having the integrated sound source decoder according to the first embodiment of the present invention shown in FIG. 11 is coded by a plurality of modes according to sound source characteristics by different coding methods for speech and audio characteristic signals. A channel decoder 503 for performing a channel decoding of an audio broadcast signal transmitted through a DAB frame to output a logical DAB frame, and receiving N logical DAB frames of the output of the channel decoder 503 and corresponding thereto. First external decoding means (510) for restoring a transmission frame of the first frame and restoring a corresponding number of sound source frames by performing a process including transmission error decoding for each of the restored transmission frames; A coding method is detected for each sound source frame, and each sound source frame is detected by a decoding method corresponding to the detected coding method. It includes an integrated source decoder 515 encoding.

The first external decoding means 510 of the first embodiment includes frame reconstruction means for detecting a synchronization of logical DAB frames and restoring a transmission frame by valid N logical DAB frames, and a valid estimated transmission frame. Transmission error decoding means for decoding the transmission error for the transmission error and payload input means for inputting the payload of the transmission error decoded transmission frame to the integrated sound source decoder 515.

The frame restoring means of the present embodiment can perform error detection or error correction for each logical DAB frame unit in N logical DAB frames of the input buffer, whereby N (1 or 2 or more) is performed. It is possible to recover a transport frame (one or more than two) by means of three logical DAB frames.

Meanwhile, in another embodiment, synchronization may be detected by detecting whether there is a valid header for the first frame among the N logical DAB frames of the input buffer, and the transmission frame may be restored by the synchronization detection. If synchronous detection is not performed, for example, the first frame may be discarded and synchronous detection may be attempted from the next N logical DAB frames.

In this case, the transmission error decoding means may proceed with the error detection and error correction process assuming that a valid transmission frame is composed of N logical DAB frames.

For example, the transmission error decoding means of the present embodiment includes an LDPC decoder 512 for performing LDPC code decoding and a deinterleaving means 511 for performing vertical data deinterleaving for a transmission frame before or after LDPC decoding. It is possible.

For example, the LDPC decoder 512 of the present embodiment may perform the reverse process of the LDPC coder shown in FIGS. 5 and 6 to restore data of the transmitting end, and the deinterleaving means 511 distributes transmission errors at the transmitting end. The reverse process of the vertical data interleaving performed for the first or second LDPC decoding may be performed before or after LDPC decoding to restore the transmission frame. Meanwhile, in the embodiment of the present invention, the error detection and error correction procedures for the header of the transport frame may be performed by decoding the CRC code or decoding the LDPC code, respectively.

The payload input unit of the embodiment of the present invention may detect the header of the transmission error decoded transmission frame and input the payload to the integrated sound source decoder 515.

For example, the integrated sound source decoder 515 of the present embodiment includes a bitstream payload demultiplex and two decoding modules of FD and LPD, and the LPD decoding module may include an ACELP and a TCX decoding tool. In addition, the integrated sound source decoder 515 of the present embodiment may include decoding tools such as MPEG Surround, enhanced SBR, and time-warped filterbank.

The bitstream payload demultiplex according to the present embodiment receives a payload, divides the payload into parts corresponding to the decoding tools, inputs them to the corresponding decoding tools, and inputs information about the bitstreams input to the respective decoding tools to each decoding tool. To pass.

For example, the integrated sound source decoder 515 of the present embodiment may be configured to include the decoder of the USAC of FIG.

The output of the integrated sound source decoder of this embodiment is output to the speaker via the audio DAC.

The digital audio receiver 500 having the integrated sound source decoder 515 of the second embodiment of the present invention shown in FIG. 13 is capable of receiving a conventional DAB broadcast and at the same time includes the integrated sound source decoder 515 of the present invention. The audio broadcasting service can be provided, and in this case, since the signal receiver can use the existing DAB broadcast receiver as it is, the manufacturing cost of the receiver 500 can be reduced.

For example, the digital audio receiver 500 including the integrated sound source decoder of the second embodiment of the present invention includes a tuner 501 for receiving and tuning an RF signal, an OFDM demodulator 502 for OFDM decoding, and a broadcast signal. A channel decoder 503 for performing channel decoding to output logical DAB frames for each service, a DAB decoder 520 for receiving and decoding DAB broadcast service data as logical DAB frames, and a first external decoding means 510; A first decoding module including an integrated sound source decoder 515 and a data packet decoder 525 are included.

The DAB decoder 520 of the present embodiment may be a commercially available music cam decoder. The first external decoding means 510 and the integrated sound source decoder 515 of the first decoding module of the present embodiment may be configured in the same manner as in the first embodiment, and may be configured by the integrated sound source decoder by one service channel. In addition to being able to receive a number of high quality audio services, DAB broadcasting services can be provided, and the configuration of the RF receiver can be shared, thereby reducing manufacturing costs.

The digital audio receiver 500 including the integrated sound source decoder of the third embodiment of the present invention shown in FIG. 14 includes a tuner 501 for receiving and tuning an RF signal, an OFDM demodulator 502 for OFDM decoding, A channel decoder 503 for performing channel decoding of broadcast signals to output logical DAB frames for each service, and a DAB decoder 520 for receiving and decoding DAB broadcast service data as logical DAB frames, and a first external decoding means ( 510, a second decoding module including a second external decoding means 530, and an integrated sound source decoder 550, and a data packet decoder 525.

The configuration of the DAB decoder 520 and the configuration of the first external decoding means 510 of the third embodiment of the present invention may be configured in the same way as that of the second embodiment.

The second external decoding means 530 of the embodiment of the present invention performs vertical data deinterleaving before or after RS decoding with RS decoder 532 which performs RS decoding on a DAB + transmission frame configured to receive a logical DAB frame. De-interleaving means 531, and secures synchronization to the logical DAB frame and restores the DAB + transmission frame, and inputs the payload to the integrated sound source decoder (550).

In the integrated sound source decoder 550 of the present embodiment, when the bitstream payload received from the first external decoding means 510 or the second external decoding means 520 is a DAB + sound source frame, the corresponding decoding method of HE-AACv2 is performed. When the sound source frame is the output of the first external decoder 510, the corresponding coding method is detected for each sound source frame, and the decoding method corresponding to the detected coding method is used for the respective sound source frames. Decoding can be performed.

In the third embodiment, decoding performed on the output of the first external decoder 510 in the integrated sound source decoder 550 may be performed by the same process as that of the first embodiment.

On the other hand, when the FD decoder of the integrated sound source decoder 550 of the present embodiment has a component for decoding a specific bitstream coded by HE-AACv2, decoding on the output of the first external decoder 510. It is possible to be decoded by the FD decoder by the same process as the method, and in some embodiments, the output of the second external decoder 520 can be directly decoded by the FD decoder.

The scope of the present invention is not limited to the above embodiments, but is determined by the matters described in the claims, and it is obvious that the present invention includes various modifications and adaptations made by those skilled in the art in the scope and equivalents of the claims.

The present invention changes the coding method in real time according to the characteristics of the sound source with respect to the input sound source, performs an optimized sound source coding, receives a signal divided into logical DAB frames and transmits the signal, corresponding to the coding method of each sound source frame. A digital audio receiver having an integrated audio source decoder and a digital audio transmission system capable of providing high quality service to both voice and music by performing decoding can be industrially available.

Claims

A sound source coder which transitions between core codecs using different coding schemes, changes coding methods, and performs optimized sound source coding according to whether an input sound source is a voice or an audio signal and detailed characteristics of the corresponding sound source;

Framed means for receiving stream data coded and input from the sound source coder, detecting specific data for coding, and generating and outputting a transmission frame including a header and a protection code of the header;

Transmission error coding means for performing a procedure including transmission error coding on the transmission frame formed by the framing means;

And transmission data generating means for dividing and generating at least one transmission frame of which the transmission error coding is completed into a predetermined number of logical DAB frames.
A sound source coder which transitions between core codecs using different coding schemes, changes coding methods, and performs optimized sound source coding according to whether an input sound source is a voice or an audio signal and detailed characteristics of the corresponding sound source;

Framed means for receiving the stream data coded and input from the sound source coder, detecting specific data for coding to generate a header, and generating and outputting a transmission frame including the header protection code;

Transmission error coding means for performing a procedure including transmission error coding on the transmission frame formed by the framing means;

Transmission data generating means for dividing and generating at least one transmission frame having the transmission error coding into a predetermined number of logical DAB frames;

And multiplexing means for receiving the output of the transmission data generating means and multiplexing and outputting the data including signaling data and service information data corresponding thereto.
The digital audio transmission system according to claim 1 or 2, wherein the transmission error coding carried out by the transmission error coding means generates an error correction code based on a turbo code.
The digital audio transmission system according to claim 1 or 2, wherein the transmission error coding means further performs a vertical data interleaving process before or after the transmission error coding.
The method according to claim 2, wherein the multiplexing means,

And at least one of another same service type transmission data, DAB transmission data, DAB + transmission data, and data broadcasting data.
The digital audio transmission system according to claim 2, wherein the signaling data has the same configuration as the signaling data of the DAB transmission system, and a value of an audio service component type is assigned differently.
3. The digital audio transmission system according to claim 1 or 2, wherein the logical DAB frame further includes an error correction code for each.
The digital audio transmission system according to claim 1 or 2, wherein the protection code of the header is an LDPC code.
A channel decoder configured to output a logical DAB frame by performing channel decoding on an audio broadcast signal, which is coded by a plurality of modes according to a sound source characteristic and is transmitted in a logical DAB frame according to a coding method for a voice and an audio characteristic signal;

Receiving each of the N logical DAB frames of the output of the channel decoder, and reconstructing the number of transmission frames corresponding to each, and performing a process including decoding of the transmission error for each of the transmission frame, each of the corresponding number of sound sources First external decoding means for reconstructing the frame;

And an integrated sound source decoder which detects a coding method for the sound source frame for each sound source frame and decodes each sound source frame by a decoding method corresponding to the detected coding method. Audio receiver.
A channel decoder configured to output a logical DAB frame by performing channel decoding on an audio broadcast signal, which is coded by a plurality of modes according to a sound source characteristic and is transmitted in a logical DAB frame according to a coding method for a voice and an audio characteristic signal;

A DAB decoding unit which receives a logical DAB frame output corresponding to a DAB service type from the channel decoder and decodes the sound source according to the header information of the logical DAB frame;

Receiving each of the N logical DAB frames of the output of the channel decoder, and reconstructing the number of transmission frames corresponding to each, and performing a process including decoding of the transmission error for each of the transmission frame, each of the corresponding number of sound sources First external decoding means for reconstructing the frame;

And an integrated sound source decoder which detects a coding method for the sound source frame for each sound source frame and decodes each sound source frame by a decoding method corresponding to the detected coding method. Audio receiver.
A channel decoder configured to output a logical DAB frame by performing channel decoding on an audio broadcast signal, which is coded by a plurality of modes according to a sound source characteristic and is transmitted in a logical DAB frame according to a coding method for a voice and an audio characteristic signal;

A DAB decoding unit which receives a logical DAB frame output corresponding to a DAB service type from the channel decoder and decodes the sound source according to the header information of the logical DAB frame;

Receiving the N logical DAB frames of the output of the channel decoder, restoring a corresponding number of transmission frames, and performing a process including decoding of transmission errors for each of the restored transport frames, respectively. First external decoding means for reconstructing the sound source frame;

Second external decoding means for receiving logical DAB frames corresponding to a DAB + service type from the channel decoder, restoring an original DAB + transmission frame, and performing RS decoding and data deinterleaving on the DAB + transmission frame to restore a DAB sound source frame and;

If the sound source frame received from the first external decoding means or the second external decoding means is a DAB + sound source frame, the corresponding method is decoded. If the sound source frame is an output of the first external decoder, And an integrated sound source decoder for detecting a coding method and decoding the respective sound source frames by a decoding method corresponding to the detected coding method.
12. The integrated sound source decoder according to any one of claims 9 to 11, further comprising means for performing a vertical data deinterleaving process before or after transmission error decoding performed in the first external decoding means. One digital audio receiver.
The digital audio receiver having an integrated sound source decoder according to any one of claims 9 to 11, wherein the transmission error decoding performed by the first external decoding means is LDPC decoding.
The digital audio with integrated sound decoder according to claim 13, wherein the transmission error decoding performed in the first external decoding means further comprises means for performing error detection by a CRC code before or after LDPC decoding. receiving set.
The integrated sound source decoder according to any one of claims 9 to 11, wherein an error correction or error detection process is performed for each logical DAB frame with respect to the logical DAB frame input to the first external decoding means. Digital audio receiver with a.
The integrated sound source decoder according to any one of claims 9 to 11, wherein the integrated sound source decoder has an FD decoder for performing decoding on a music characteristic signal, wherein the FD decoder is a specific bitstream decoded by HE-AACv2 of DAB +. And a component for decoding the digital audio receiver.