KR20080035448A - Method and apparatus for encoding/decoding multi channel audio signal - Google Patents

Abstract

A method and an apparatus for encoding and decoding a multi-channel audio signal are provided to perform the up-mixing of decoded core audio data by using decoded residual coding data, thereby decoding core audio data and residual coding data in the same decoding type to reduce the complexity of a decoder. A method for encoding and decoding a multi-channel audio signal comprises the following steps of: detecting a type of space extension data included in the encoding result of the audio signal(700); detecting a core audio object type when the space extension data is data indicating the core audio object type in which core audio data is encoded(710); decoding the core audio data in a decoding type according to the detected core audio object type(720); decoding residual coding data in the decoding type according to the core audio object type when the space extension data is residual coding data(730); and up-mixing the decoded core audio data by using the decoded residual coding data(740).

Description

Method and apparatus for encoding / decoding multi-channel audio signal

The present invention relates to a method and apparatus for encoding / decoding multichannel audio signals, and more particularly, to a method and apparatus for encoding / decoding residual signals used for upmixing an audio signal.

Moving Picture Experts Group (MPEG) surround technology is a technology that compresses audio data for a sound source in a space in encoding an audio signal, and includes MP3 (MPEG Audio Layer-3) and MPEG-4 Advanced Audio Coding (AAC). Or, convert an audio signal compressed with MPEG-4 High Efficiency (AAC) -AAC into high quality multi-channel surround audio. MPEG surround has the advantage of maintaining backward compatibility with existing stereo equipment and reducing the bitrate, i.e., transmission speed, required for high quality multi-channel audio compression while using existing equipment.

According to the MPEG surround standard, the core audio signal is encoded by using any one of a coding method such as Bit Sliced Arithmetic Coding (BSAC), AAC, or MPEG Audio Layer-3 (MP3), but a residual signal is used. signal) is encoded only by AAC.

Therefore, when the core audio signal is encoded using a coding scheme other than AAC according to the MPEG surround standard, the core audio signal and the residual signal must be encoded by different encoding schemes. Similarly, the decoding end should decode the core audio signal and the residual signal by different decoding methods.

An object of the present invention is to provide a method and apparatus for decoding a multi-channel audio signal that can reduce the complexity of the decoding stage when decoding the residual signal.

In addition, another object of the present invention is to provide a method and apparatus for encoding a multi-channel audio signal that can reduce the complexity of the encoding stage when the residual signal is encoded.

According to an aspect of the present invention, there is provided a method of decoding a multichannel audio signal, the method including: detecting a type of spatial extension data included in an encoding result of an audio signal; Detecting the core audio object type when the spatial extension data is data representing a core audio object type in which core audio data is encoded; Decoding the core audio data by a decoding method according to the detected core audio object type; Decoding the residual coded data by the decoding method according to the core audio object type when the spatial extension data is residual coded data; And upmixing the decoded core audio data using the decoded residual coded data.

The task may include detecting a type of spatial extension data included in an encoding result of an audio signal; Detecting the core audio object type when the spatial extension data is data representing a core audio object type in which core audio data is encoded; Decoding the core audio data by a decoding method according to the detected core audio object type; Decoding the residual coded data by the decoding method according to the core audio object type when the spatial extension data is residual coded data; And upmixing the decoded core audio data using the decoded residual coded data. The method may be achieved by a computer-readable recording medium having recorded thereon a program for executing a method of decoding a multichannel audio signal.

In addition, the apparatus for decoding a multi-channel audio signal according to the present invention for solving the other problem is a spatial extension data type detection unit for detecting the type of spatial extension data included in the encoding result of the audio signal; A core audio object type detector for detecting the core audio object type when the spatial extension data is data indicating a core audio object type in which core audio data is encoded; A core audio data decoder which decodes the core audio data by a decoding method according to the detected core audio object type; A residual coded data decoder configured to decode the residual coded data by the decoding method according to the core audio object type when the spatial extension data is residual coded data; And an upmixing unit for upmixing the decoded core audio data by using the decoded residual coding data.

In addition, the method for encoding a multi-channel audio signal according to the present invention for solving the another problem comprises the steps of: downmixing the input audio signal to generate core audio data and residual data; Encoding the core audio data according to a predetermined encoding method; Encoding the residual data according to the predetermined encoding method according to a core audio object type, which is a method of encoding the core audio data; And outputting the encoded core audio data and the encoded residual data as an encoding result of the audio signal.

In addition, another object of the present invention is to downmix the input audio signal to generate core audio data and residual data; Encoding the core audio data according to a predetermined encoding method; Encoding the residual data according to the predetermined encoding method according to a core audio object type, which is a method of encoding the core audio data; And outputting the encoded core audio data and the encoded residual data as an encoding result of the audio signal. A computer-readable recording medium having recorded thereon a program for executing a multi-channel audio signal encoding method. Is achieved by.

In addition, the apparatus for encoding a multi-channel audio signal according to the present invention for solving the another problem comprises a downmixing unit for downmixing the input audio signal to generate the core audio data and the residual data; A core audio data encoder which encodes the core audio data according to a predetermined encoding method; A residual data encoder which encodes the residual data according to the predetermined encoding method according to a core audio object type which is a method of encoding the core audio data; And a multiplexer for outputting the encoded core audio data and the encoded residual data as an encoding result of the audio signal.

In addition, the decoding method of the multi-channel audio signal according to the present invention for solving the another problem is a step of receiving a bitstream corresponding to the downmixed audio core signal and a bitstream including the additional information for generating the multi-channel ; Detecting a core object type from a bitstream corresponding to the downmixed audio core signal; Decoding the down-mixed audio core signal by a decoding scheme determined by the detected core object type; If the spatial extension data included in the additional information for generating the multi-channel is residual coded data, decoding the residual coded data by the decoding method according to the core audio object type; And upmixing the decoded core audio data using the decoded residual coded data.

According to the present invention, a type of spatial extension data included in an encoding result of an audio signal is detected, and when the spatial extension data is data representing a core audio object type in which core audio data is encoded, a core audio object type is detected. Decode the core audio data by a decoding method according to the detected core audio object type, and when the spatial extension data is residual coding data, decode the residual coding data by the decoding method according to the core audio object type, and decode By upmixing the core audio data using the decoded residual coding data, the complexity of the decoding stage can be reduced by decoding the core audio data and the residual coding data by the same decoding method.

Further, according to the present invention, a core audio object is generated by downmixing an input audio signal to generate core audio data and residual data, encoding core audio data according to a predetermined encoding method, and encoding the core audio data. Residual data is encoded according to a predetermined encoding method according to the type, and the core audio data and the residual data are output as the encoding result of the audio signal by encoding the encoded core audio data and the encoded residual data as the same encoding scheme. By coding, the complexity of the coding stage can be reduced.

With respect to the embodiments of the present invention disclosed in the text, specific structural to functional descriptions are merely illustrated for the purpose of describing embodiments of the present invention, embodiments of the present invention may be implemented in various forms and It should not be construed as limited to the embodiments described in.

As the inventive concept allows for various changes and numerous embodiments, particular embodiments will be illustrated in the drawings and described in detail in the text. However, this is not intended to limit the present invention to the specific disclosed form, it should be understood to include all modifications, equivalents, and substitutes included in the spirit and scope of the present invention. In describing the drawings, similar reference numerals are used for the components.

Unless defined otherwise, all terms used herein, including technical or scientific terms, have the same meaning as commonly understood by one of ordinary skill in the art. Terms such as those defined in the commonly used dictionaries should be construed as having meanings consistent with the meanings in the context of the related art and shall not be construed in ideal or excessively formal meanings unless expressly defined in this application. Do not.

Hereinafter, with reference to the accompanying drawings, it will be described in detail a preferred embodiment of the present invention. The same reference numerals are used for the same elements in the drawings, and duplicate descriptions of the same elements are omitted.

1 is a block diagram illustrating an apparatus for decoding a multichannel audio signal according to an embodiment of the present invention.

Referring to FIG. 1, an apparatus for decoding a multichannel audio signal includes a demultiplexing unit 100, a spatial extension data type detecting unit 110, and a core audio object type detection unit. detecting unit 120, a core audio data decoding unit 130, a residual coding data decoding unit 140, an abiteriary downmix residual coding data decoder a mixed residual coding data decoding unit 150, and an up-mixing unit 160.

The demultiplexer 100 demultiplexes a bitstream from an encoding terminal through the input terminal IN.

2 is a diagram illustrating syntax for detecting a spatial extension data type according to an embodiment of the present invention. FIG. 3 is a diagram illustrating an embodiment of a table to which values corresponding to "bsSacExtType" shown in FIG. 2 are assigned. Hereinafter, an operation of the spatial extension data type detection unit 110 will be described with reference to FIGS. 1 to 3.

The spatial extension data type detector 110 detects the type of spatial extension data from the header of the demultiplexed data by the demultiplexer 100. In more detail, the spatial extension data type detector 110 may detect the type of spatial extension data from the header of the demultiplexed data by the function SpatialExtensionConfig () shown in FIG. 2. In the function SpatialExtensionConfig (), "bsSacExtType" indicates the type of spatial extension data.

Referring to FIG. 3, in one embodiment of the present invention, if "bsSacExtType" is '0', the spatial extension data is residual coding data, and if "bsSacExtType" is '1', the spatial extension data is an abiteriary downmix ledge. If the data is dual coded and "bsSacExtType" is '12', the spatial extension data is a core audio object type of MPEG-4 audio. Here, the core audio object type refers to an audio object type for encoding a downmixed signal at the encoding end. However, this is only one embodiment of the present invention, those skilled in the art can understand that various modifications are possible.

In other words, the spatial extension data type detection unit 110 determines that the type of the spatial extension data is residual coding data when '0' is assigned to the "bsSacExtType", and the spatial extension when '1' is assigned to the "bsSacExtType". It is determined that the data type is Abiteri Downmix residual coding data, and when '12' is assigned to "bsSacExtType", it is determined that the type of spatial extension data is data representing a core audio object type of MPEG-4 audio.

Hereinafter, an operation of an audio signal decoding apparatus according to the spatial extension data type detected by the spatial extension data type detection unit 110 will be described.

First, a case in which the spatial extension data type detected by the spatial extension data type detector 110 is data representing the core audio object type of MPEG-4 audio will be described. In other words, in this case "bsSacExtType" is '12'.

4 is a diagram illustrating syntax for reading a core audio object type according to an embodiment of the present invention. Hereinafter, the operation of the core audio object type detector 120 will be described with reference to FIGS. 1 and 4.

When the spatial extension data type detection unit 110 detects the type of the spatial extension data and determines that the spatial extension data is data representing the core audio object type of MPEG-4 audio, the core audio object type detection unit 120 determines the core audio. Detect the object type.

In more detail, the core audio object type detector 120 may read the core audio object type by the function “SpatialExtensionConfigData 12” illustrated in FIG. 4. Here, "coreAudioObjectType" represents a core audio object type of MPEG-4 audio.

Referring back to FIG. 1, the core audio data decoder 130 decodes core audio data demultiplexed by the demultiplexer 100. In more detail, the core audio data decoder 130 decodes the demultiplexed core audio data according to the core audio object type detected by the core audio object type detector 120.

As described above, the core audio object type refers to an audio object type for encoding a downmixed signal at the encoding end. Here, the core audio data may be encoded by any one of various encoding schemes such as bit sliced arithmetic coding (BSAC), advanced audio coding (AAC), and MPEG audio layer-3 (MP3). Here, BSAC, AAC, MP3 and the like are only embodiments of the present invention, and those skilled in the art can understand that the core audio data can be encoded by various encoding schemes.

Second, a case in which the spatial extension data type detected by the spatial extension data type detection unit 110 is residual coded data will be described. In other words, in this case "bsSacExtType" is '0'.

5 is a diagram illustrating syntax for decoding residual coded data according to an embodiment of the present invention. Hereinafter, the operation of the residual coded data decoder 140 will be described with reference to FIGS. 1 and 5.

The residual coded data decoder 140 includes a first core audio object type determiner 141, a first BSAC decoder 142, and a first AAC decoder 143 to decode the residual coded data. .

When the spatial extension data type detection unit 110 detects the type of the spatial extension data and determines that the spatial extension data is residual coding data, the first core audio object type determination unit 141 determines that the core audio object type is 'BSAC'. Determine whether or not.

Referring to FIG. 5, since '22' is assigned as the core audio object type of 'BSAC', the first core audio object type determination unit 141 determines that the "coreAudioObjectType" detected by the core audio object type detection unit 120 is ''. It is determined whether or not it corresponds to 22 '.

As a result of the determination by the first core audio object type determiner 141, when the core audio object type corresponds to 'BSAC', the first BSAC decoder 142 decodes the residual signal by 'BSAC'. For example, the first BSAC decoder 142 may be implemented by the identification number 500 or 520 of the syntax illustrated in FIG. 5. At identification number 500 or 520, the first BSAC decoder 142 decodes the residual coded data by the function bsac_raw_data_block () defined in the MPEG-4 ER BSAC. Here, "nch" of bsac_raw_data_block () should always be set to '1'. Here, "nch" represents the number of channels.

If it is determined by the first core audio object type determiner 141 that the core audio object type does not correspond to 'BSAC', the first AAC decoder 143 decodes the residual coded data by 'AAC'. For example, the first AAC decoder 143 may be implemented by the identification number 510 or 530 of the syntax illustrated in FIG. 5. In identification number 510 or 530, the first AAC decoding unit 143 performs residual coding by individual_channel_stream (0) defined in "MPEG-2 AAC Low Complexity profile bitstream syntax" described in subclause 6.3 of ISO / IEC 13818-7. Decrypt the data.

However, in the first AAC decoder 143, 'AAC' is merely an example, and when the first core audio object type determiner 141 determines that the core audio object type does not correspond to the 'BSAC', The first AAC decoder 143 may decode the residual coded data by a decoding method corresponding to the core audio object type detected by the first core audio object type determiner 141. For example, when the core audio object type detected by the first core audio object type determination unit 141 is 'MP3', the first AAC decoder 143 decodes the residual coding data by 'MP3'.

As described above, the core audio data decoded by the core audio data decoder 130 is upgraded to the multi-channel signal using the residual coding data decoded by the first BSAC decoder 142 or the first AAC decoder 143. You can mix.

Third, a case in which the spatial extension data type detected by the spatial extension data type detection unit 110 is the Abiteri down mix residual coding data will be described. In other words, in this case "bsSacExtType" is '1'.

6 is a diagram illustrating syntax for decoding Abiteri down mix residual data according to an embodiment of the present invention. Hereinafter, an operation of the abiteri down mix residual coded data decoder 150 will be described with reference to FIGS. 1 and 6.

The abiteri down mix residual coding data decoder 150 includes a second core audio object type discriminator 151, a second BSAC decoder 152, and a second AAC decoder 153. Decode the mix residual coded data.

As a result of the determination by the second core audio object type determiner 151, when the core audio object type corresponds to 'BSAC', the second BSAC decoder 152 uses the BSAC to perform bitwise down mix residual coding data. Decrypt For example, the second BSAC decoder 152 may be implemented by at least one of the identification numbers 600, 620, 640, and 660 of the syntax illustrated in FIG. 6. In at least one of identification numbers 600, 620, 640, and 660, the second BSAC decoder 152 decodes the Abiteri downmix residual coded data by a function bsac_raw_data_block () defined in the MPEG-4 ER BSAC. . Here, "nch" of bsac_raw_data_block () should always be set to '1'. Here, "nch" represents the number of channels.

If it is determined by the first core audio object type determination unit 151 that the core audio object type does not correspond to 'BSAC', the second AAC decoding unit 152 uses the AAC to determine the bitwise down mix residual coding data. Decrypt For example, the second AAC decoder 153 may be implemented by at least one of the identification numbers 610, 630, 650, and 670 of the syntax illustrated in FIG. 6. At identification number 610 or 650, the second AAC decoding unit 153 is assigned to Abiteri down by the individual_channel_stream (0) defined in "MPEG-2 AAC Low Complexity profile bitstream syntax" described in subclause 6.3 of ISO / IEC 13818-7. Decode the mix residual coded data. In addition, at identification number 630 or 670, the second AAC decoding unit 153 uses abiteri by channel_pair_element () defined in "MPEG-2 AAC Low Complexity profile bitstream syntax" described in subclause 6.3 of ISO / IEC 13818-7. Decode the down mix residual coded data. Here, the parameter "common_window" is set to '1'.

However, in the second AAC decoder 153, 'AAC' is merely an example, and when the second core audio object type determiner 151 determines that the core audio object type does not correspond to 'BSAC', The second AAC decoder 153 may decode the Abiteri down mix residual coded data in a decoding manner corresponding to the core audio object type detected by the second core audio object type determiner 151. For example, when the core audio object type detected by the first core audio object type determination unit 151 is 'MP3', the second AAC decoder 153 uses the MP3 to abbreviate downmix residual coding data. Decode

As described above, the core audio data decoded by the core audio data decoder 130 may be multiplied by using the Abiteri downmix residual coding data decoded by the second BSAC decoder 152 or the second AAC decoder 153. Upmix to channel signal.

Fourth, the case in which the spatial extension data type detected by the spatial extension data type detection unit 110 is not data representing the core audio object type of MPEG-4 audio, residual coding data, or Abiteri downmix residual coding data will be described. Let's look at it.

The spatial extension data decoder 160 performs decoding in a manner corresponding to the type of the spatial extension data detected by the spatial extension data type detector 110. As described above, the core audio data decoded by the core audio data decoder 130 may be upmixed into a multi-channel signal using the data decoded by the spatial extension data decoder 160.

The upmixer 170 may be configured to convert the core audio data decoded by the core audio data decoder 130 into the first and second BSAC decoders 142 and 152, the first and second ACC decoders 143 and 153, Alternatively, the result of the decoding by the spatial extension data decoder 160 is upmixed into a multi-channel signal. Here, upmixing is a concept opposite to downmixing, in which stereo signals are generated from two or more channels from a mono signal.

7 is a flowchart illustrating a method of decoding a multichannel audio signal according to an embodiment of the present invention.

Referring to FIG. 7, the method for decoding a multi-channel audio signal according to the present embodiment includes steps that are processed in time series in an apparatus for decoding an audio signal shown in FIG. 1. Therefore, even if omitted below, the above description of the audio signal decoding apparatus shown in FIG. 1 is also applied to the audio signal decoding method according to the present embodiment.

In operation 700, the spatial extension data type detector 110 detects the type of spatial extension data included in the encoding result of the audio signal.

In step 710, the core audio object type detector 120 detects the core audio object type when the spatial extension data is data representing the core audio object type, which is a method of encoding the core audio data.

In operation 720, the core audio data decoder 130 decodes the core audio data by a decoding method according to the detected core audio object type.

In operation 730, when the spatial extension data is residual coding data, the residual coding data decoder 140 decodes the residual coding data by a decoding method according to the core audio object type.

In operation 740, the upmixing unit 170 upmixes the decoded core audio data using the decoded residual coding data.

The decoding method of the audio signal according to the present embodiment further includes the step of decoding the Abiteri down mix residual coding data by a decoding method according to the core audio object type when the spatial extension data is Avi Treri down mix residual coding data. It may include. In this case, the upmixing unit 170 may upmix the decoded core audio data by using the decoded residual coding data and the decoded Abiteri downmix residual coding data.

In addition, the decoding method of the audio signal according to the present embodiment is a decoding method according to the type of the spatial extension data, when the spatial extension data is data other than the data indicating the core audio object type, residual coding data and Abiteri downmix coding data The method may further include decoding the spatial extension data. In this case, the upmixing unit 170 may upmix the decoded core audio data by using the decoded residual coding data, the decoded Abiteri down mix residual coding data, and the decoded spatial extension data.

8 is a block diagram illustrating an apparatus for encoding a multichannel audio signal according to an embodiment of the present invention.

Referring to FIG. 8, an apparatus for encoding a multi-channel audio signal includes a down-mixing unit 800, a core audio data encoding unit 810, and a residual data encoding unit. unit, 820, an arbitrary down-mix residual data encoding unit 830, and a multiplexing unit 840.

The downmixing unit 800 downmixes the input signal IN. Here, the input signal IN may be a pulse code modulation (PCM) signal obtained by modulating an analog voice signal or an audio signal into a digital signal. Here, downmixing generates a mono signal of one channel from stereo signals of two or more channels, and the amount of bits allocated to the encoding process can be reduced through downmixing.

The core audio data encoder 810 encodes the core audio data output from the downmixer 800 according to a predetermined encoding method. Here, the core audio data may be encoded by any one of various coding schemes such as bit sliced arithmetic coding (BSAC), advanced audio coding (AAC), and MPEG audio layer-3 (MP3). Here, BSAC, AAC, MP3 and the like are only embodiments of the present invention, and those skilled in the art can understand that the core audio data can be encoded by various encoding schemes.

The residual data encoder 820 may include a first core audio object type determining unit 821, a first BSAC encoding unit 822, and a first AAC encoding unit. 823) to encode the residual data.

The first core audio object type determiner 821 determines a core audio object type, which is a method of encoding core audio data by the core audio data encoder 810, and determines a coding method of residual data. For example, when the core audio object type is 'BSAC', the first core audio object type determination unit 821 determines the encoding method of the residual data as 'BSAC', and when the core audio object type is 'AAC'. The encoding method of the residual data is determined as 'AAC'.

The first BSAC encoder 822 encodes the residual data in the 'BSAC' method when the core audio object type is 'BSAC' as a result of the determination by the first core audio object type determiner 821. As a result, the complexity of the encoding end can be reduced by encoding the core audio data and the residual data by the same encoding scheme.

The first AAC encoder 823 encodes the residual data in the 'AAC' method when the core audio object type is 'AAC' as a result of the determination by the first core audio object type determiner 821. As a result, the complexity of the encoding end can be reduced by encoding the core audio data and the residual data by the same encoding scheme.

However, in the first AAC encoder 823, 'AAC' is merely an embodiment, and when the first core audio object type determiner 821 determines that the core audio object type does not correspond to 'BSAC', The first AAC decoder 823 may encode the residual data by an encoding method corresponding to the core audio object type detected by the first core audio object type determiner 821. For example, when the core audio object type detected by the first core audio object type determination unit 821 is 'MP3', the first AAC encoder 823 encodes the residual data by 'MP3'.

The Abiteri down mix residual data encoder 830 includes a second core audio object type determiner 831, a second BSAC encoder 832, and a second AAC encoder 833 to encode residual data. do.

The second core audio object type determiner 831 determines a core audio object type, which is a method of encoding core audio data by the core audio data encoder 810, and determines a coding method of the residual data. For example, when the core audio object type is 'BSAC', the second core audio object type determination unit 831 determines the encoding method of the residual data as 'BSAC', and when the core audio object type is 'AAC'. The encoding method of the residual data is determined as 'AAC'.

The second BSAC encoder 832 encodes the residual data in the 'BSAC' method when the core audio object type is 'BSAC' as a result of the determination by the second core audio object type determiner 831. As a result, the complexity of the encoding end can be reduced by encoding the core audio data and the residual data by the same encoding scheme.

The second AAC encoder 833 encodes the residual data in the 'AAC' method when the core audio object type is 'AAC' as a result of the determination by the second core audio object type determiner 831. As a result, the complexity of the encoding end can be reduced by encoding the core audio data and the residual data by the same encoding scheme.

However, in the second AAC encoder 833, 'AAC' is merely an example, and when the second core audio object type determiner 831 determines that the core audio object type does not correspond to 'BSAC', The second AAC decoder 833 may encode the residual data by an encoding method corresponding to the core audio object type detected by the second core audio object type determiner 831. For example, when the core audio object type detected by the second core audio object type determination unit 831 is 'MP3', the second AAC encoder 833 encodes the residual data by 'MP3'.

The multiplexer 840 encodes a result of the core audio data encoder 810, a result of the first and second BSAC encoders 822 and 832, and a first and second AAC encoders 823 and 833. ), The encoded result is multiplexed, and a bitstream is generated and output to the output terminal OUT.

9 is a flowchart illustrating a method of encoding a multichannel audio signal according to an embodiment of the present invention.

Referring to FIG. 9, the method for encoding a multichannel audio signal according to the present embodiment includes the steps of time-series processing in the apparatus for encoding an audio signal of FIG. Therefore, even if omitted below, the above description of the audio signal encoding apparatus shown in FIG. 8 is also applied to the audio signal encoding method according to the present embodiment.

In operation 900, the downmixing unit 900 downmixes the input audio signal to generate core audio data and residual data.

In operation 910, the core audio data encoder 910 encodes the core audio data according to a predetermined encoding method.

In operation 920, the residual data encoder 920 encodes the residual data according to a predetermined encoding method according to the core audio object type, which is a method of encoding core audio data.

In operation 930, the multiplexer 940 multiplexes the encoded core audio data and the encoded residual data and outputs the encoded result of the audio signal.

In operation 900, the input audio signal may be downmixed to generate core audio data, residual data, and abiteri down mix residual data. In this case, the encoding method of the audio signal according to the present embodiment may further include encoding the Abiteri down mix residual data according to a predetermined encoding scheme according to the core audio object type. In this case, the multiplexing unit 940 may multiplex the encoded core audio data, the encoded residual data, and the encoded Abiteri down mix residual data and output the result of encoding the audio signal.

The present invention is not limited to the above-described embodiment, and of course, modifications may be made by those skilled in the art within the spirit of the present invention.

The invention can also be embodied as computer readable code on a computer readable recording medium. The computer-readable recording medium includes all kinds of recording devices in which data that can be read by a computer system is stored. Examples of computer-readable recording media include ROM, RAM, CD-ROM, magnetic tape, hard disk, floppy disk, flash memory, optical data storage device, and also carrier waves (for example, transmission over the Internet). It also includes the implementation in the form of. The computer readable recording medium can also be distributed over network coupled computer systems so that the computer readable code is stored and executed in a distributed fashion.

1 is a block diagram illustrating an apparatus for decoding a multichannel audio signal according to an embodiment of the present invention.

2 is a diagram illustrating syntax for detecting a spatial extension data type according to an embodiment of the present invention.

FIG. 3 is a diagram illustrating an embodiment of a table to which values corresponding to "bsSacExtType" shown in FIG. 2 are assigned.

4 is a diagram illustrating syntax for reading a core audio object type according to an embodiment of the present invention.

5 is a diagram illustrating syntax for decoding residual coded data according to an embodiment of the present invention.

6 is a diagram illustrating syntax for decoding Abiteri down mix residual data according to an embodiment of the present invention.

7 is a flowchart illustrating a method of decoding a multichannel audio signal according to an embodiment of the present invention.

8 is a block diagram illustrating an apparatus for encoding a multichannel audio signal according to an embodiment of the present invention.

9 is a flowchart illustrating a method of encoding a multichannel audio signal according to an embodiment of the present invention.

Claims (21)

Detecting a type of spatial extension data included in an encoding result of the audio signal; Detecting the core audio object type when the spatial extension data is data representing a core audio object type in which core audio data is encoded; Decoding the core audio data by a decoding method according to the detected core audio object type; Decoding the residual coded data by the decoding method according to the core audio object type when the spatial extension data is residual coded data; And And upmixing the decoded core audio data using the decoded residual coded data. The method of claim 1, If the spatial extension data is Abiteri down mix residual coding data, further comprising: decoding the Abiteri down mix residual coding data by the decoding method according to the core audio object type. Method for decoding channel audio signal. The method of claim 2, The upmixing step And up-mixing the decoded core audio data using the decoded residual coding data and the decoded abiteri down mix residual coding data. The method of claim 2, When the spatial extension data is data other than the data indicating the core audio object type, the residual coding data and the abiteri down mix coding data, the spatial extension data is decoded by a decoding method according to the type of the spatial extension data. The method of decoding a multi-channel audio signal further comprising the step. The method of claim 4, wherein The upmixing step And decoding the decoded core audio data by using the decoded residual coding data, the decoded bitwise down mix residual coding data, and the decoded spatial extension data. Way. Detecting a type of spatial extension data included in an encoding result of the audio signal; Detecting the core audio object type when the spatial extension data is data representing a core audio object type in which core audio data is encoded; Decoding the core audio data by a decoding method according to the detected core audio object type; Decoding the residual coded data by the decoding method according to the core audio object type when the spatial extension data is residual coded data; And And upmixing the decoded core audio data using the decoded residual coded data. A computer-readable recording medium having recorded thereon a program for executing a method of decoding a multichannel audio signal. A spatial extension data type detector for detecting a type of spatial extension data included in an encoding result of the audio signal; A core audio object type detector for detecting the core audio object type when the spatial extension data is data indicating a core audio object type in which core audio data is encoded; A core audio data decoder which decodes the core audio data by a decoding method according to the detected core audio object type; A residual coded data decoder configured to decode the residual coded data by the decoding method according to the core audio object type when the spatial extension data is residual coded data; And And an upmixing unit configured to upmix the decoded core audio data by using the decoded residual coded data. The method of claim 7, wherein If the spatial extension data is Abiteri down mix residual coding data, an Abiteri down mix residual coding data decoding unit for decoding the Abiteri down mix residual coding data by the decoding method according to the core audio object type Apparatus for decoding a multi-channel audio signal comprising a. The method of claim 8, The upmixing unit And up-mixing the decoded core audio data using the decoded residual coding data and the decoded bitwise down mix residual coding data. The method of claim 8, When the spatial extension data is data other than the data indicating the core audio object type, the residual coding data and the abiteri down mix coding data, the spatial extension data is decoded by a decoding method according to the type of the spatial extension data. An apparatus for decoding a multichannel audio signal, further comprising a spatial extension data decoder. The method of claim 10, The upmixing unit And decoding the decoded core audio data by using the decoded residual coding data, the decoded bitwise down mix residual coding data, and the decoded spatial extension data. Device. Downmixing the input audio signal to generate core audio data and residual data; Encoding the core audio data according to a predetermined encoding method; Encoding the residual data according to the predetermined encoding method according to a core audio object type, which is a method of encoding the core audio data; And And outputting the encoded core audio data and the encoded residual data as an encoding result of the audio signal. The method of claim 12, The downmixing step And downmixing the input audio signal to generate the core audio data, the residual data, and the abiteri down-mix residual data. The method of claim 13, And encoding the abiteri down mix residual data according to the predetermined encoding scheme according to the core audio object type. The method of claim 14, The output as the encoding result is And encoding the coded core audio data, the coded residual data, and the coded bitwise down mix residual data as an encoding result of the audio signal. Downmixing the input audio signal to generate core audio data and residual data; Encoding the core audio data according to a predetermined encoding method; Encoding the residual data according to the predetermined encoding method according to a core audio object type, which is a method of encoding the core audio data; And And outputting the encoded core audio data and the encoded residual data as an encoding result of the audio signal. A program for executing a multi-channel audio signal encoding method may be read by a computer. Recording media. A downmixing unit for downmixing the input audio signal to generate core audio data and residual data; A core audio data encoder which encodes the core audio data according to a predetermined encoding method; A residual data encoder which encodes the residual data according to the predetermined encoding method according to a core audio object type which is a method of encoding the core audio data; And And a multiplexer for outputting the encoded core audio data and the encoded residual data as an encoding result of the audio signal. The method of claim 16, The downmixing unit And down-mixing the input audio signal to generate the core audio data, the residual data, and the abiteri down mix residual data. The method of claim 17, The apparatus for encoding a multi-channel audio signal according to claim 6, further comprising an abiteri down mix residual data encoder for encoding the abiteri down mix residual data according to the predetermined encoding scheme according to the core audio object type. The method of claim 19, The multiplexer And output the coded core audio data, the coded residual data, and the coded abiteri down-mix residual data as an encoding result of the audio signal. Receiving a bitstream corresponding to a downmixed audio core signal and a bitstream including additional information for generating multichannels; Detecting a core object type from a bitstream corresponding to the downmixed audio core signal; Decoding the down-mixed audio core signal by a decoding scheme determined by the detected core object type; If the spatial extension data included in the additional information for generating the multi-channel is residual coded data, decoding the residual coded data by the decoding method according to the core audio object type; And And upmixing the decoded core audio data using the decoded residual coded data.

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